Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
640
FNUS55 KRIW 180650
FWFRIW
Fire Weather Planning Forecast for Western and Central Wyoming
National Weather Service Riverton WY
1250 AM MDT Fri Sep 18 2026
.DISCUSSION...
...Yellowstone NP and Teton dispatch areas (includes fire weather
zones 140...414...415...and 416)...
Moisture will continue to move over the area today and bring another
day of showers and thunderstorms, with the most numerous storms in
the northern zones. Relative humidity will remain well above
critical levels. Wind should be light to moderate except in and
around any shower or thunderstorm. Mixing and smoke dispersal will
be generally fair to poor. Expect more showers and thunderstorms
Friday night into Saturday.
...Cody dispatch area (includes fire weather zones 275...276...
282...283...285...286...287...288...and 289)...
Moisture will continue to move over the area today and bring another
day of showers and thunderstorms, with the most numerous storms in
the western zones. Relative humidity will remain well above
critical levels. Wind should be light to moderate except in and
around any shower or thunderstorm. Mixing and smoke dispersal will
be generally fair to poor. Expect more showers and thunderstorms
Friday night into Saturday and possibly Sunday.
...Casper dispatch area (includes fire weather zones 277...278...
279...280...281...285...289...and 300)...
Moisture will continue to move over the area today and bring another
day of showers and thunderstorms, with the most numerous storms in
the western zones zones. Relative humidity will remain well above
critical levels. Wind should be light to moderate except in and
around any shower or thunderstorm. Mixing and smoke dispersal will
be generally fair to poor. Expect more showers and thunderstorms
Friday night into Saturday and possibly Sunday.
...Thunderstorms imply strong gusty and erratic winds...
WYZ280-190900-
Natrona County/Casper BLM-
Including the cities of Casper and Midwest
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Mostly sunny then becoming partly cloudy.
Slight chance of showers in the afternoon.
Slight chance of thunderstorms late in the
afternoon. Some thunderstorms may produce heavy
rainfall late in the afternoon. Some
thunderstorms may produce heavy rainfall late
in the afternoon. Chance of precipitation 20
percent.
Chance of thunder...20 percent.
Max temperature.....75-80.
24 hr trend......9 degrees warmer.
Min humidity........35-41 percent.
24 hr trend......11 percent drier.
20-foot winds.......Southwest winds around 10 mph with higher
gusts.
Ridge top winds.....Southwest around 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West around 15 mph.
Mixing Height.......1200-3200 ft agl until 1200, then 5200-7000 ft
agl.
Smoke dispersal.....Fair to good.
.TONIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Showers likely and chance of thunderstorms in
the evening, then chance of showers after
midnight. Patchy fog after midnight. Patchy fog
early in the morning. Some thunderstorms may
produce heavy rainfall early in the evening.
Some thunderstorms may produce heavy rainfall
late in the evening. Chance of precipitation 70
percent.
Chance of thunder...40 percent.
Min temperature.....48-53.
24 hr trend......1 degree cooler.
Max humidity........86-92 percent.
24 hr trend......Unchanged.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 20
mph until 2400, then 10 mph.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.35 percent until 2400, then 5 percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......1800-3800 ft agl until 2400, then 400-800 ft
agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Partly cloudy. Slight chance of showers in the
morning. Chance of showers and slight chance of
thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall in the
afternoon. Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....67-72.
24 hr trend......8 degrees cooler.
Min humidity........44-50 percent.
24 hr trend......9 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph with gusts to around 25 mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.Zero percent until 1200, then 10 percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 5400-7400 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Showers likely and slight chance of
thunderstorms in the evening, then showers likely after midnight.
Lows in the mid 40s. Winds generally less than 10 mph.
.SUNDAY...Partly cloudy. Showers likely and slight chance of
thunderstorms. Lows in the lower 40s. Highs in the lower 60s.
Winds generally less than 10 mph.
.MONDAY...Mostly clear. Lows in the mid 40s. Highs in the upper
60s. Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows in the upper 40s. Highs in the mid 70s.
Winds generally less than 10 mph.
.WEDNESDAY THROUGH THURSDAY...Mostly clear. Lows in the upper
40s. Highs 76 to 81.
$$
WYZ283-190900-
Upper Wind River Basin/Wind River Basin-
Including the cities of Crowheart, Lander, Riverton, and Shoshoni
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy. Chance of showers and slight
chance of thunderstorms in the afternoon.
Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....70-75.
24 hr trend......3 degrees warmer.
Min humidity........38-44 percent.
24 hr trend......2 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200. Winds
southwest around 10 mph after 1500. Gusts up to
20 mph.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.Zero percent until 1200, then 10 percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......600-2600 ft agl until 1200, then 4400-6400 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers likely and chance of
thunderstorms in the evening, then chance of
showers and slight chance of thunderstorms
after midnight. Patchy fog after midnight.
Chance of precipitation 70 percent.
Chance of thunder...30 percent.
Min temperature.....48-53.
24 hr trend......1 degree cooler.
Max humidity........83-89 percent.
24 hr trend......6 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......South winds around 10 mph and gusty until 2100,
then west and gusty until 2400, then
downslope/downvalley 4-7 mph.
Ridge top winds.....Southwest around 15 mph until 2400, then west.
Chc of wetting rain.35 percent until 2400, then 5 percent.
Transport winds.....Southwest around 15 mph until 2400, then
northwest.
Mixing Height.......1000-3000 ft agl until 2400, then 600-1000 ft
agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Partly cloudy. Chance of showers and slight
chance of thunderstorms. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....62-67.
24 hr trend......9 degrees cooler.
Min humidity........51-57 percent.
24 hr trend......12 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
northwest around 10 mph. Gusts up to 20 mph.
Ridge top winds.....West around 10 mph until 1200, then northwest.
Chc of wetting rain.Zero percent until 1200, then 20 percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 5000-7000 ft
agl.
Smoke dispersal.....Poor until 1200, then fair to good.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Showers and slight chance of thunderstorms.
Lows in the mid 40s. Winds generally less than 10 mph.
.SUNDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows in the mid 40s. Highs in the lower 60s.
Winds generally less than 10 mph.
.MONDAY...Mostly clear. Lows in the mid 40s. Highs in the upper
60s. Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows in the upper 40s. Highs in the mid 70s.
Winds generally less than 10 mph.
.WEDNESDAY THROUGH THURSDAY...Mostly clear. Lows in the upper
40s. Highs 74 to 79.
$$
WYZ285-190900-
South Bighorn Mountains-
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy. Chance of showers and slight
chance of thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall in the
afternoon. Chance of precipitation 40 percent.
Chance of thunder...20 percent.
Max temperature.....69-74.
24 hr trend......5 degrees warmer.
Min humidity........37-43 percent.
24 hr trend......7 percent drier.
20-foot winds.......West winds around 10 mph until 0900, then
upslope/upvalley 5-9 mph until 1500, then
southwest around 10 mph. Gusts up to 15 mph.
Ridge top winds.....West around 15 mph until 1200, then southwest.
Chc of wetting rain.Zero percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 4800-6800 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers and chance of
thunderstorms in the evening, then chance of
showers and slight chance of thunderstorms
after midnight. Patchy fog after midnight. Some
thunderstorms may produce heavy rainfall early
in the evening. Some thunderstorms may produce
heavy rainfall in the late evening and early
morning, then some thunderstorms may produce
heavy rainfall early in the morning. Chance of
precipitation 90 percent.
Chance of thunder...40 percent.
Min temperature.....47-52.
24 hr trend......4 degrees cooler.
Max humidity........85-91 percent.
24 hr trend......10 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......South winds around 10 mph until 2400, then
downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.60 percent until 2400, then 10 percent.
Transport winds.....South around 15 mph until 2400, then southwest.
Mixing Height.......1200-3200 ft agl until 2400, then 600-800 ft
agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Slight chance of thunderstorms in the morning.
Chance of showers through the day. Chance of
thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall. Some
thunderstorms may produce heavy rainfall late
in the afternoon. Chance of precipitation 50
percent.
Chance of thunder...30 percent.
Max temperature.....58-63.
24 hr trend......11 degrees cooler.
Min humidity........59-65 percent.
24 hr trend......21 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph. Gusts up to 20 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.10 percent until 1200, then 35 percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......600-2600 ft agl until 1200, then 4000-6000 ft
agl.
Smoke dispersal.....Poor to fair.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Showers and slight chance of thunderstorms.
Lows in the mid 40s. Northwest winds around 10 mph.
.SUNDAY...Showers and slight chance of thunderstorms. Lows in the
lower 40s. Highs in the mid 50s. Winds generally less than
10 mph.
.MONDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the mid 40s. Highs in the lower 60s. Winds
generally less than 10 mph.
.TUESDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the upper 40s. Highs in the upper 60s.
Winds generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the upper 40s. Highs in the upper 60s.
.THURSDAY...Mostly sunny. Highs in the lower 70s.
$$
WYZ281-190900-
Johnson County/Casper BLM-
Including the cities of Buffalo and Kaycee
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall in the
afternoon. Chance of precipitation 20 percent.
Chance of thunder...20 percent.
Max temperature.....73-78.
24 hr trend......6 degrees warmer.
Min humidity........37-43 percent.
24 hr trend......3 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph.
Ridge top winds.....West around 10 mph until 1200, then northeast.
Chc of wetting rain.Zero percent.
Transport winds.....Northwest around 10 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 4800-6800 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers and chance of
thunderstorms in the evening, then chance of
showers and slight chance of thunderstorms
after midnight. Patchy fog early in the
morning. Some thunderstorms may produce heavy
rainfall in the evening. Some thunderstorms may
produce heavy rainfall after midnight. Chance
of precipitation 90 percent.
Chance of thunder...40 percent.
Min temperature.....50-55.
24 hr trend......1 degree warmer.
Max humidity........87-93 percent.
24 hr trend......1 percent drier.
Humidity recovery...Excellent.
20-foot winds.......North winds around 10 mph until 2100, then west
until 2400, then downslope/downvalley 4-7 mph.
Gusts up to 15 mph.
Ridge top winds.....Northwest 10 to 15 mph.
Chc of wetting rain.55 percent until 2400, then 20 percent.
Transport winds.....Northwest 10 to 15 mph.
Mixing Height.......1400-3400 ft agl until 2400, then 600-800 ft
agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers and slight chance of
thunderstorms in the morning. Showers likely
and chance of thunderstorms in the afternoon.
Some thunderstorms may produce heavy rainfall
until late afternoon. Some thunderstorms may
produce heavy rainfall late in the afternoon.
Chance of precipitation 70 percent.
Chance of thunder...40 percent.
Max temperature.....62-67.
24 hr trend......11 degrees cooler.
Min humidity........65-71 percent.
24 hr trend......27 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 10 mph
until 1200, then 20 mph.
Ridge top winds.....North around 10 mph.
Chc of wetting rain.10 percent until 1200, then 25 percent.
Transport winds.....Northwest around 10 mph.
Mixing Height.......600-2600 ft agl until 1200, then 3600-5600 ft
agl.
Smoke dispersal.....Poor to fair.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Showers and chance of thunderstorms in the
evening, then showers and slight chance of thunderstorms after
midnight. Lows in the lower 50s. Winds generally less than
10 mph.
.SUNDAY...Showers and chance of thunderstorms. Lows in the upper
40s. Highs in the lower 60s. Winds generally less than 10 mph.
.MONDAY...Mostly clear with slight chance of showers and
thunderstorms. Lows in the upper 40s. Highs around 70. Winds
generally less than 10 mph.
.TUESDAY...Partly cloudy. Slight chance of showers and
thunderstorms. Lows in the lower 50s. Highs in the upper 70s.
Winds generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows around 50. Highs in the upper 70s.
.THURSDAY...Mostly sunny. Highs around 80.
$$
WYZ282-190900-
South Bighorn Basin/Worland BLM-
Including the cities of Ten Sleep, Thermopolis, and Worland
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Mostly sunny then becoming partly cloudy.
Slight chance of showers in the afternoon.
Slight chance of thunderstorms in the
afternoon. Chance of showers late in the
afternoon. Some thunderstorms may produce heavy
rainfall in the afternoon. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....72-77.
24 hr trend......5 degrees warmer.
Min humidity........35-41 percent.
24 hr trend......3 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......600-2600 ft agl until 1200, then 4200-6200 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers and chance of
thunderstorms in the evening, then chance of
showers and slight chance of thunderstorms
after midnight. Patchy fog early in the
morning. Some thunderstorms may produce heavy
rainfall early in the evening. Some
thunderstorms may produce heavy rainfall in the
late evening and early morning, then some
thunderstorms may produce heavy rainfall early
in the morning. Chance of precipitation 90
percent.
Chance of thunder...30 percent.
Min temperature.....47-52.
24 hr trend......1 degree cooler.
Max humidity........85-91 percent.
24 hr trend......11 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......Southwest winds around 10 mph until 2100, then
downslope/downvalley 4-7 mph. Gusts up to 20
mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.60 percent until 2400, then 10 percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......800-2800 ft agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Slight chance of thunderstorms in the morning.
Showers likely through the day. Chance of
thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall. Some
thunderstorms may produce heavy rainfall late
in the afternoon. Chance of precipitation 70
percent.
Chance of thunder...30 percent.
Max temperature.....60-65.
24 hr trend......13 degrees cooler.
Min humidity........62-68 percent.
24 hr trend......30 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then north
around 10 mph with higher gusts.
Ridge top winds.....Northwest around 10 mph.
Chc of wetting rain.10 percent until 1200, then 20 percent.
Transport winds.....Northwest around 10 mph.
Mixing Height.......600-2600 ft agl until 1200, then 3200-5200 ft
agl.
Smoke dispersal.....Poor to fair.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Showers and slight chance of thunderstorms.
Lows in the upper 40s. Northwest winds around 10 mph.
.SUNDAY...Mostly cloudy. Showers likely and slight chance of
thunderstorms. Lows in the mid 40s. Highs in the lower 60s. Winds
generally less than 10 mph.
.MONDAY...Mostly clear. Lows in the upper 40s. Highs around 70.
Winds generally less than 10 mph.
.TUESDAY...Partly cloudy. Slight chance of showers and
thunderstorms. Lows around 50. Highs in the mid 70s. Winds
generally less than 10 mph.
.WEDNESDAY THROUGH THURSDAY...Mostly clear. Lows around 50. Highs
76 to 81.
$$
WYZ275-190900-
North Bighorn Basin/Worland BLM-
Including the cities of Greybull, Lovell, and Powell
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall in the
afternoon. Chance of precipitation 20 percent.
Chance of thunder...20 percent.
Max temperature.....70-75.
24 hr trend......4 degrees warmer.
Min humidity........37-43 percent.
24 hr trend......1 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
southwest around 10 mph with higher gusts.
Ridge top winds.....South around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......400-2400 ft agl until 1200, then 3800-5800 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers likely and chance of
thunderstorms in the evening, then chance of
showers and slight chance of thunderstorms
after midnight. Patchy fog early in the
morning. Some thunderstorms may produce heavy
rainfall. Chance of precipitation 70 percent.
Chance of thunder...30 percent.
Min temperature.....47-52.
24 hr trend......1 degree cooler.
Max humidity........86-92 percent.
24 hr trend......11 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......Northwest winds around 10 mph with gusts to
around 25 mph.
Ridge top winds.....Northwest around 15 mph.
Chc of wetting rain.60 percent until 2400, then 20 percent.
Transport winds.....Northwest around 15 mph.
Mixing Height.......800-2800 ft agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Showers likely and slight chance of
thunderstorms in the morning. Showers and
chance of thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall until
late afternoon. Some thunderstorms may produce
heavy rainfall early in the afternoon. Chance
of precipitation near 100 percent.
Chance of thunder...40 percent.
Max temperature.....57-62.
24 hr trend......14 degrees cooler.
Min humidity........70-76 percent.
24 hr trend......33 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
northwest around 10 mph with gusts to around 25
mph.
Ridge top winds.....Northwest 10 to 15 mph.
Chc of wetting rain.30 percent until 1200, then 40 percent.
Transport winds.....Northwest 10 to 15 mph.
Mixing Height.......600-2200 ft agl until 1200, then 2400-4400 ft
agl.
Smoke dispersal.....Poor.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Showers likely and slight chance of
thunderstorms in the evening, then showers and slight chance of
thunderstorms after midnight. Lows in the upper 40s. Northwest
winds around 10 mph.
.SUNDAY...Mostly cloudy. Showers likely and slight chance of
thunderstorms. Lows in the mid 40s. Highs in the lower 60s. Winds
generally less than 10 mph.
.MONDAY...Mostly clear. Lows in the upper 40s. Highs around 70.
Winds generally less than 10 mph.
.TUESDAY...Mostly clear. Slight chance of showers. Lows around
50. Highs in the mid 70s. Winds generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the upper 40s. Highs in the mid 70s.
.THURSDAY...Mostly sunny. Highs in the upper 70s.
$$
WYZ276-190900-
Cody Foothills-
Including the cities of Clark, Cody, and Meeteetse
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy. Slight chance of showers in the
morning, then showers likely and chance of
thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall early
in the afternoon. Some thunderstorms may
produce heavy rainfall late in the afternoon.
Chance of precipitation 70 percent.
Chance of thunder...30 percent.
Max temperature.....68-73.
24 hr trend......1 degree warmer.
Min humidity........45-51 percent.
24 hr trend......10 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then west
around 10 mph. Gusts up to 15 mph.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.Zero percent until 1200, then 40 percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......800-2800 ft agl until 1200, then 3000-5000 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers and chance of
thunderstorms in the evening, then chance of
showers and slight chance of thunderstorms
after midnight. Patchy fog after midnight. Some
thunderstorms may produce heavy rainfall early
in the evening. Some thunderstorms may produce
heavy rainfall in the late evening and
overnight. Chance of precipitation 90 percent.
Chance of thunder...30 percent.
Min temperature.....48-53.
24 hr trend......3 degrees cooler.
Max humidity........85-91 percent.
24 hr trend......16 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......West winds around 10 mph until 2100, then
downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....Northwest around 10 mph.
Chc of wetting rain.60 percent until 2400, then 30 percent.
Transport winds.....Northwest around 10 mph.
Mixing Height.......600-2000 ft agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Showers likely and slight chance of
thunderstorms in the morning, then showers and
chance of thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall in the
morning. Some thunderstorms may produce heavy
rainfall in the afternoon. Chance of
precipitation near 100 percent.
Chance of thunder...40 percent.
Max temperature.....56-61.
24 hr trend......13 degrees cooler.
Min humidity........70-76 percent.
24 hr trend......35 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then north
around 10 mph. Gusts up to 20 mph.
Ridge top winds.....North 10 to 15 mph.
Chc of wetting rain.35 percent until 1200, then 70 percent.
Transport winds.....North 10 to 15 mph.
Mixing Height.......1400-3400 ft agl.
Smoke dispersal.....Poor.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Showers and slight chance of thunderstorms in
the evening, then showers after midnight. Lows in the upper 40s.
Winds generally less than 10 mph.
.SUNDAY...Partly cloudy. Showers likely and slight chance of
thunderstorms. Lows in the mid 40s. Highs in the upper 50s. Winds
generally less than 10 mph.
.MONDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the upper 40s. Highs in the upper 60s.
Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows around 50. Highs in the lower 70s. Winds
generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows around 50. Highs in the lower 70s.
.THURSDAY...Mostly sunny. Highs in the mid 70s.
$$
WYZ287-190900-
Owl Creek Mountains-
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy. Showers likely and chance of
thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall early
in the afternoon. Some thunderstorms may
produce heavy rainfall late in the afternoon.
Chance of precipitation 70 percent.
Chance of thunder...30 percent.
Max temperature.....67-72.
24 hr trend......4 degrees warmer.
Min humidity........39-45 percent.
24 hr trend......2 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
southwest around 10 mph. Gusts up to 15 mph.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.Zero percent until 1200, then 10 percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 4000-6000 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers and chance of
thunderstorms in the evening, then showers
likely and slight chance of thunderstorms after
midnight. Patchy fog early in the morning. Some
thunderstorms may produce heavy rainfall in the
evening. Some thunderstorms may produce heavy
rainfall after midnight. Chance of
precipitation 80 percent.
Chance of thunder...30 percent.
Min temperature.....46-51.
24 hr trend......3 degrees cooler.
Max humidity........85-91 percent.
24 hr trend......14 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......Southwest winds around 10 mph until 2400, then
downslope/downvalley 4-7 mph. Gusts up to 20
mph.
Ridge top winds.....Southwest around 15 mph until 2400, then
northwest.
Chc of wetting rain.60 percent until 2400, then 15 percent.
Transport winds.....Southwest around 15 mph until 2400, then
northwest.
Mixing Height.......800-2800 ft agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers and slight chance of
thunderstorms in the morning, then showers and
chance of thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall until
late afternoon. Some thunderstorms may produce
heavy rainfall late in the afternoon. Chance of
precipitation 90 percent.
Chance of thunder...30 percent.
Max temperature.....56-61.
24 hr trend......11 degrees cooler.
Min humidity........64-70 percent.
24 hr trend......24 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
northeast around 10 mph. Gusts up to 15 mph.
Ridge top winds.....Northeast around 10 mph.
Chc of wetting rain.10 percent until 1200, then 40 percent.
Transport winds.....West around 10 mph.
Mixing Height.......600-2400 ft agl until 1200, then 4000-6000 ft
agl.
Smoke dispersal.....Poor to fair.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Showers and slight chance of thunderstorms.
Lows in the mid 40s. Winds generally less than 10 mph.
.SUNDAY...Partly cloudy. Showers likely and slight chance of
thunderstorms. Lows in the mid 40s. Highs in the mid 50s. Winds
generally less than 10 mph.
.MONDAY...Mostly clear. Lows in the upper 40s. Highs in the mid
60s. Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the upper 40s. Highs in the upper 60s.
Winds generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the upper 40s. Highs around 70.
.THURSDAY...Mostly sunny. Highs in the lower 70s.
$$
WYZ286-190900-
Absaroka Mountains/North Shoshone NF-
Including the city of Pahaska
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Chance of showers and slight chance of
thunderstorms in the morning, then showers and
chance of thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall in the
afternoon. Chance of precipitation near 100
percent.
Chance of thunder...40 percent.
Max temperature.....60-65.
24 hr trend......2 degrees cooler.
Min humidity........54-60 percent.
24 hr trend......4 percent wetter.
20-foot winds.......West winds around 10 mph until 0900, then
upslope/upvalley 5-9 mph. Gusts up to 15 mph.
Ridge top winds.....West around 10 mph until 1200, then south.
Chc of wetting rain.Zero percent until 1200, then 65 percent.
Transport winds.....West around 10 mph until 1200, then south.
Mixing Height.......1800-3800 ft agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers and chance of
thunderstorms in the evening, then chance of
showers and slight chance of thunderstorms
after midnight. Patchy fog after midnight. Some
thunderstorms may produce heavy rainfall early
in the evening. Some thunderstorms may produce
heavy rainfall in the late evening and
overnight. Chance of precipitation 90 percent.
Chance of thunder...30 percent.
Min temperature.....42-47.
24 hr trend......3 degrees cooler.
Max humidity........84-90 percent.
24 hr trend......2 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....West 5 to 10 mph.
Chc of wetting rain.55 percent until 2400, then 25 percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......600-2000 ft agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Partly cloudy. Showers likely and slight chance
of thunderstorms in the morning, then showers
and chance of thunderstorms in the afternoon.
Some thunderstorms may produce heavy rainfall
in the morning. Some thunderstorms may produce
heavy rainfall in the afternoon. Chance of
precipitation near 100 percent.
Chance of thunder...40 percent.
Max temperature.....49-54.
24 hr trend......10 degrees cooler.
Min humidity........68-74 percent.
24 hr trend......17 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....West around 10 mph.
Chc of wetting rain.20 percent until 1200, then 60 percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 3000-5000 ft
agl.
Smoke dispersal.....Poor to fair.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Showers and slight chance of thunderstorms in
the evening, then showers likely after midnight. Lows in the
upper 30s. Winds generally less than 10 mph.
.SUNDAY...Partly cloudy. Showers likely and slight chance of
thunderstorms. Lows in the upper 30s. Highs in the lower 50s.
Winds generally less than 10 mph.
.MONDAY THROUGH TUESDAY...Partly cloudy with slight chance of
showers and thunderstorms. Lows in the lower 40s. Highs 57 to 62.
Winds generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the lower 40s. Highs in the lower 60s.
.THURSDAY...Mostly sunny. Highs in the mid 60s.
$$
WYZ140-190900-
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Mostly cloudy. Patchy fog in the morning.
Showers likely and slight chance of
thunderstorms in the morning, then showers and
chance of thunderstorms in the afternoon.
Chance of precipitation near 100 percent.
Chance of thunder...40 percent.
Max temperature.....61-66.
24 hr trend......2 degrees warmer.
Min humidity........57-63 percent.
24 hr trend......8 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....South around 10 mph.
Chc of wetting rain.15 percent until 1200, then 60 percent.
Transport winds.....South 10 to 15 mph.
Mixing Height.......1400-3400 ft agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers and chance of
thunderstorms in the evening. Chance of showers
and slight chance of thunderstorms after
midnight. Patchy fog. Chance of precipitation
90 percent.
Chance of thunder...30 percent.
Min temperature.....39-44.
24 hr trend......2 degrees cooler.
Max humidity........86-92 percent.
24 hr trend......Unchanged.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....Southeast around 5 mph.
Chc of wetting rain.50 percent until 2400, then 20 percent.
Transport winds.....South 5 to 10 mph.
Mixing Height.......400-1800 ft agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Mostly cloudy. Chance of showers and slight
chance of thunderstorms in the morning, then
showers likely and chance of thunderstorms in
the afternoon. Chance of precipitation 70
percent.
Chance of thunder...30 percent.
Max temperature.....50-55.
24 hr trend......10 degrees cooler.
Min humidity........71-77 percent.
24 hr trend......10 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.30 percent until 1200, then 55 percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......600-2600 ft agl until 1200, then 2800-4000 ft
agl.
Smoke dispersal.....Poor.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Showers likely and slight chance of
thunderstorms in the evening, then showers likely after midnight.
Lows in the mid 30s. Winds generally less than 10 mph.
.SUNDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the mid 30s. Highs in the mid 50s. Winds
generally less than 10 mph.
.MONDAY...Partly cloudy. Lows in the upper 30s. Highs around 60.
Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the upper 30s. Highs in the lower 60s.
Winds generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the upper 30s. Highs in the lower 60s.
.THURSDAY...Mostly sunny. Highs in the mid 60s.
$$
WYZ415-190900-
North Zone Bridger Teton NF and Grand Teton NP-
Including the cities of Jackson and Moran
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Patchy fog in the morning. Chance of showers
and slight chance of thunderstorms in the
morning, then showers and chance of
thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall early
in the afternoon. Some thunderstorms may be
severe with heavy rainfall late in the
afternoon. Chance of precipitation 90 percent.
Chance of thunder...40 percent.
Max temperature.....57-62.
24 hr trend......2 degrees warmer.
Min humidity........66-72 percent.
24 hr trend......9 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....South around 10 mph.
Chc of wetting rain.5 percent until 1200, then 65 percent.
Transport winds.....South 10 to 15 mph.
Mixing Height.......600-2600 ft agl until 1200, then 2600-4000 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers and chance of
thunderstorms in the evening. Chance of showers
and slight chance of thunderstorms after
midnight. Patchy fog. Some thunderstorms may be
severe with heavy rainfall early in the
evening. Some thunderstorms may be severe with
heavy rainfall late in the evening, then some
thunderstorms may produce heavy rainfall.
Chance of precipitation 90 percent.
Chance of thunder...30 percent.
Min temperature.....36-41.
24 hr trend......3 degrees cooler.
Max humidity........89-95 percent.
24 hr trend......Unchanged.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....Southeast 5 to 10 mph.
Chc of wetting rain.45 percent until 2400, then 10 percent.
Transport winds.....South 5 to 10 mph.
Mixing Height.......400-2000 ft agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Slight chance of thunderstorms in the morning.
Showers likely through the day. Chance of
thunderstorms in the afternoon. Some
thunderstorms may produce heavy rainfall in the
morning. Some thunderstorms may produce heavy
rainfall in the afternoon. Chance of
precipitation 70 percent.
Chance of thunder...30 percent.
Max temperature.....49-54.
24 hr trend......8 degrees cooler.
Min humidity........71-77 percent.
24 hr trend......2 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....West around 10 mph.
Chc of wetting rain.10 percent until 1200, then 45 percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......800-2800 ft agl until 1200, then 3200-4600 ft
agl.
Smoke dispersal.....Poor.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Mostly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then chance of showers
after midnight. Lows in the upper 30s. Winds generally less than
10 mph.
.SUNDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows in the mid 30s. Highs in the mid 50s.
Winds generally less than 10 mph.
.MONDAY...Partly cloudy. Lows in the upper 30s. Highs in the
lower 60s. Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the upper 30s. Highs in the lower 60s.
Winds generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the upper 30s. Highs in the lower 60s.
.THURSDAY...Mostly sunny. Highs in the mid 60s.
$$
WYZ416-190900-
West Wind River Mountains/East Zone Bridger Teton NF-
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Patchy fog early in the morning. Chance of
showers and slight chance of thunderstorms in
the morning, then showers likely and chance of
thunderstorms in the afternoon. Chance of
precipitation 70 percent.
Chance of thunder...40 percent.
Max temperature.....55-60.
24 hr trend......3 degrees cooler.
Min humidity........59-65 percent.
24 hr trend......4 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then south
around 10 mph. Gusts up to 20 mph.
Ridge top winds.....South 10 to 15 mph.
Chc of wetting rain.10 percent until 1200, then 50 percent.
Transport winds.....South 10 to 15 mph.
Mixing Height.......1600-3600 ft agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Showers and chance of thunderstorms in the
evening. Chance of showers and slight chance of
thunderstorms after midnight. Patchy fog early
in the evening. Patchy fog in the late evening
and overnight. Chance of precipitation 90
percent.
Chance of thunder...30 percent.
Min temperature.....36-41.
24 hr trend......4 degrees cooler.
Max humidity........88-94 percent.
24 hr trend......Unchanged.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....Southeast around 10 mph.
Chc of wetting rain.60 percent until 2400, then 5 percent.
Transport winds.....South around 10 mph.
Mixing Height.......600-2200 ft agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Partly cloudy. Chance of showers and slight
chance of thunderstorms in the morning. Showers
and chance of thunderstorms in the afternoon.
Chance of precipitation 80 percent.
Chance of thunder...30 percent.
Max temperature.....48-53.
24 hr trend......7 degrees cooler.
Min humidity........59-65 percent.
24 hr trend......3 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph. Gusts up to 20 mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.17 percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......1200-3200 ft agl until 1200, then 4200-6200 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then chance of showers
after midnight. Lows in the lower 30s. Winds generally less than
10 mph.
.SUNDAY...Partly cloudy with chance of showers, slight chance of
thunderstorms and snow showers. Lows in the lower 30s. Highs
around 50. Winds generally less than 10 mph.
.MONDAY...Partly cloudy. Lows in the mid 30s. Highs in the mid
50s. Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the mid 30s. Highs in the upper 50s. Winds
generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the mid 30s. Highs in the upper 50s.
.THURSDAY...Mostly sunny. Highs around 60.
$$
WYZ288-190900-
East Wind River Mountains/South Shoshone NF-
Including the cities of Dubois and South Pass
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Chance of showers and slight chance of
thunderstorms in the morning, then showers
likely and chance of thunderstorms in the
afternoon. Chance of precipitation 70 percent.
Chance of thunder...30 percent.
Max temperature.....61-66.
24 hr trend......1 degree cooler.
Min humidity........52-58 percent.
24 hr trend......2 percent wetter.
20-foot winds.......Southwest winds around 10 mph with gusts to
around 25 mph.
Ridge top winds.....Southwest around 15 mph.
Chc of wetting rain.Zero percent until 1200, then 35 percent.
Transport winds.....Southwest around 15 mph.
Mixing Height.......1200-3200 ft agl until 1200, then 3400-5400 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers and chance of
thunderstorms in the evening, then chance of
showers and slight chance of thunderstorms
after midnight. Patchy fog after midnight.
Chance of precipitation 80 percent.
Chance of thunder...30 percent.
Min temperature.....40-45.
24 hr trend......4 degrees cooler.
Max humidity........83-89 percent.
24 hr trend......4 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......Southwest winds around 10 mph and gusty until
2100, then downslope/downvalley 4-7 mph.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.50 percent until 2400, then 5 percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......600-2400 ft agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Partly cloudy. Slight chance of thunderstorms
in the morning. Chance of showers through the
day. Chance of thunderstorms in the afternoon.
Chance of precipitation 50 percent.
Chance of thunder...30 percent.
Max temperature.....53-58.
24 hr trend......7 degrees cooler.
Min humidity........53-59 percent.
24 hr trend......1 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 0900, then west
around 10 mph with gusts to around 30 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.5 percent until 1200, then 20 percent.
Transport winds.....Southwest 15 to 20 mph.
Mixing Height.......1600-3600 ft agl until 1200, then 5200-7200 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then good to very
good.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Mostly cloudy. Showers likely and slight chance
of thunderstorms in the evening, then chance of showers after
midnight. Lows in the upper 30s. Winds generally less than
10 mph.
.SUNDAY...Partly cloudy with showers likely, slight chance of
thunderstorms and snow showers. Lows in the upper 30s. Highs in
the lower 50s. Winds generally less than 10 mph.
.MONDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows around 40. Highs in the upper 50s. Winds
generally less than 10 mph.
.TUESDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows in the lower 40s. Highs in the lower 60s.
Winds generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the lower 40s. Highs in the lower 60s.
.THURSDAY...Mostly sunny. Highs in the mid 60s.
$$
WYZ414-190900-
Salt and Wyoming Ranges/West Zone Bridger Teton NF-
Including the city of Afton
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Patchy fog early in the morning. Chance of
showers and slight chance of thunderstorms in
the morning, then showers and chance of
thunderstorms in the afternoon. Some
thunderstorms may be severe late in the
afternoon. Chance of precipitation 90 percent.
Chance of thunder...40 percent.
Max temperature.....57-62.
24 hr trend......1 degree warmer.
Min humidity........61-67 percent.
24 hr trend......5 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then south
around 10 mph with gusts to around 25 mph.
Ridge top winds.....South 10 to 15 mph.
Chc of wetting rain.25 percent until 1200, then 70 percent.
Transport winds.....South 10 to 15 mph.
Mixing Height.......600-2600 ft agl until 1200, then 2600-4200 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Showers and chance of thunderstorms in the
evening. Chance of showers and slight chance of
thunderstorms after midnight. Patchy fog in the
late evening and overnight. Some thunderstorms
may be severe early in the evening. Some
thunderstorms may be severe late in the
evening. Chance of precipitation 90 percent.
Chance of thunder...30 percent.
Min temperature.....35-40.
24 hr trend......5 degrees cooler.
Max humidity........90-96 percent.
24 hr trend......Unchanged.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....South around 10 mph.
Chc of wetting rain.50 percent until 2400, then 5 percent.
Transport winds.....South around 10 mph.
Mixing Height.......600-2200 ft agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers and slight chance of
thunderstorms in the morning, then showers
likely and chance of thunderstorms in the
afternoon. Chance of precipitation 70 percent.
Chance of thunder...30 percent.
Max temperature.....49-54.
24 hr trend......8 degrees cooler.
Min humidity........63-69 percent.
24 hr trend......2 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph. Gusts up to 20 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.10 percent until 1200, then 40 percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1200-3200 ft agl until 1200, then 3600-5600 ft
agl.
Smoke dispersal.....Poor to fair.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Mostly cloudy. Slight chance of showers and
thunderstorms in the evening, then slight chance of showers after
midnight. Lows in the mid 30s. Winds generally less than 10 mph.
.SUNDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the mid 30s. Highs in the mid 50s. Winds
generally less than 10 mph.
.MONDAY...Partly cloudy. Lows in the upper 30s. Highs in the
lower 60s. Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows around 40. Highs in the lower 60s. Winds
generally less than 10 mph.
.WEDNESDAY THROUGH THURSDAY...Mostly clear. Lows around 40. Highs
63 to 68.
$$
WYZ278-190900-
Upper Green River Basin/Rock Springs BLM-
Including the cities of Big Piney, Farson, and Pinedale
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Patchy fog early in the morning. Chance of
showers and slight chance of thunderstorms in
the morning, then showers likely and chance of
thunderstorms in the afternoon. Chance of
precipitation 70 percent.
Chance of thunder...40 percent.
Max temperature.....59-64.
24 hr trend......1 degree cooler.
Min humidity........49-55 percent.
24 hr trend......2 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
southeast around 10 mph with higher gusts.
Ridge top winds.....North around 10 mph until 1200, then south.
Chc of wetting rain.10 percent until 1200, then 55 percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......400-2400 ft agl until 1200, then 3000-4800 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Showers likely and chance of thunderstorms in
the evening. Slight chance of showers and
thunderstorms after midnight. Patchy fog in the
late evening and overnight. Chance of
precipitation 70 percent.
Chance of thunder...30 percent.
Min temperature.....37-42.
24 hr trend......3 degrees cooler.
Max humidity........88-94 percent.
24 hr trend......Unchanged.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....East around 10 mph until 2400, then northwest.
Chc of wetting rain.50 percent until 2400, then zero percent.
Transport winds.....East around 10 mph until 2400, then south.
Mixing Height.......400-2400 ft agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms in the morning. Chance of showers
and thunderstorms in the afternoon. Chance of
precipitation 50 percent.
Chance of thunder...30 percent.
Max temperature.....52-57.
24 hr trend......6 degrees cooler.
Min humidity........50-56 percent.
24 hr trend......1 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph with gusts to around 25 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.Less than 5 percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 5800-7800 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Partly cloudy. Slight chance of showers and
thunderstorms in the evening, then slight chance of showers after
midnight. Lows in the mid 30s. Winds generally less than 10 mph.
.SUNDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the mid 30s. Highs around 60. Winds
generally less than 10 mph.
.MONDAY...Partly cloudy. Lows in the upper 30s. Highs in the mid
60s. Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the upper 30s. Highs in the upper 60s.
Winds generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the upper 30s. Highs in the upper 60s.
.THURSDAY...Mostly sunny. Highs around 70.
$$
WYZ277-190900-
Lincoln and Uinta Counties/Lower Elevations-
Including the cities of Evanston, Fort Bridger, and Kemmerer
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Patchy fog early in the morning. Chance of
showers and slight chance of thunderstorms in
the morning, then showers and chance of
thunderstorms in the afternoon. Some
thunderstorms may be severe late in the
afternoon. Chance of precipitation 90 percent.
Chance of thunder...40 percent.
Max temperature.....60-65.
24 hr trend......1 degree cooler.
Min humidity........49-55 percent.
24 hr trend......5 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then
southeast around 10 mph. Gusts up to 20 mph.
Ridge top winds.....Southeast around 10 mph.
Chc of wetting rain.10 percent until 1200, then 65 percent.
Transport winds.....South 10 to 15 mph.
Mixing Height.......600-2400 ft agl until 1200, then 2800-4400 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Partly cloudy. Showers and chance of
thunderstorms in the evening. Slight chance of
showers and thunderstorms after midnight.
Patchy fog late in the evening. Some
thunderstorms may be severe early in the
evening. Some thunderstorms may be severe late
in the evening. Chance of precipitation 90
percent.
Chance of thunder...30 percent.
Min temperature.....37-42.
24 hr trend......4 degrees cooler.
Max humidity........89-95 percent.
24 hr trend......Unchanged.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph until 2100, then
east around 10 mph until 2400, then
downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....East around 10 mph until 2400, then west.
Chc of wetting rain.45 percent until 2400, then zero percent.
Transport winds.....Southeast around 10 mph until 2400, then
southwest.
Mixing Height.......600-2600 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms in the morning. Chance of showers
and thunderstorms in the afternoon. Chance of
precipitation 50 percent.
Chance of thunder...30 percent.
Max temperature.....54-59.
24 hr trend......6 degrees cooler.
Min humidity........45-51 percent.
24 hr trend......2 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
10 to 15 mph with gusts to around 25 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.Less than 5 percent.
Transport winds.....West around 10 mph until 1200, then around 20
mph.
Mixing Height.......1400-3400 ft agl until 1200, then 5400-7400 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Partly cloudy. Slight chance of showers and
thunderstorms in the evening. Lows in the mid 30s. Winds
generally less than 10 mph.
.SUNDAY...Mostly clear. Lows in the mid 30s. Highs in the lower
60s. Winds generally less than 10 mph.
.MONDAY...Partly cloudy. Lows around 40. Highs in the mid 60s.
Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the upper 30s. Highs in the upper 60s.
Winds generally less than 10 mph.
.WEDNESDAY THROUGH THURSDAY...Mostly clear. Lows in the upper
30s. Highs 67 to 72.
$$
WYZ279-190900-
Sweetwater County/Rock Springs BLM/Flaming Gorge NRA-
Including the cities of Green River, Rock Springs, and Wamsutter
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy. Patchy fog early in the morning.
Slight chance of thunderstorms in the morning.
Chance of showers through the day. Chance of
thunderstorms in the afternoon. Chance of
precipitation 50 percent.
Chance of thunder...40 percent.
Max temperature.....65-70.
24 hr trend......Unchanged.
Min humidity........46-52 percent.
24 hr trend......3 percent drier.
20-foot winds.......South winds 10 to 15 mph with gusts to around
25 mph.
Ridge top winds.....South around 15 mph.
Chc of wetting rain.5 percent until 1200, then 25 percent.
Transport winds.....Southwest around 15 mph.
Mixing Height.......600-2600 ft agl until 1200, then 3400-5200 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Partly cloudy. Showers likely and chance of
thunderstorms in the evening, then slight
chance of showers and thunderstorms after
midnight. Patchy fog after midnight. Chance of
precipitation 70 percent.
Chance of thunder...30 percent.
Min temperature.....42-47.
24 hr trend......4 degrees cooler.
Max humidity........84-90 percent.
24 hr trend......1 percent drier.
Humidity recovery...Excellent.
20-foot winds.......South winds around 10 mph until 2400, then
downslope/downvalley 4-7 mph. Gusts up to 20
mph.
Ridge top winds.....South 10 to 15 mph.
Chc of wetting rain.25 percent until 2400, then zero percent.
Transport winds.....South 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 2400, then 400-800 ft
agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Partly cloudy. Slight chance of showers in the
morning. Chance of showers and thunderstorms in
the afternoon. Chance of precipitation 50
percent.
Chance of thunder...30 percent.
Max temperature.....57-62.
24 hr trend......7 degrees cooler.
Min humidity........54-60 percent.
24 hr trend......3 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 0900, then west
10 to 15 mph with gusts to around 25 mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.Zero percent until 1200, then 20 percent.
Transport winds.....Southwest around 10 mph until 1200, then west
around 20 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 4800-6800 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Partly cloudy. Slight chance of showers and
thunderstorms in the evening, then chance of showers after
midnight. Lows in the upper 30s. Winds generally less than
10 mph.
.SUNDAY...Partly cloudy with slight chance of showers. Lows in
the upper 30s. Highs in the lower 60s. Winds generally less than
10 mph.
.MONDAY...Mostly clear. Lows in the lower 40s. Highs in the upper
60s. Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows in the lower 40s. Highs around 70. Winds
generally less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the lower 40s. Highs around 70.
.THURSDAY...Mostly sunny. Highs in the lower 70s.
$$
WYZ289-190900-
Granite/Green/Ferris/Rattlesnake Mountains-
Including the city of Jeffrey City
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy. Patchy fog early in the morning.
Slight chance of showers in the late morning
and early afternoon. Slight chance of
thunderstorms in the afternoon. Chance of
showers late in the afternoon. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....68-73.
24 hr trend......1 degree warmer.
Min humidity........39-45 percent.
24 hr trend......5 percent drier.
20-foot winds.......Southwest winds around 10 mph with gusts to
around 25 mph.
Ridge top winds.....Southwest around 15 mph.
Chc of wetting rain.Zero percent until 1200, then 15 percent.
Transport winds.....Southwest around 15 mph.
Mixing Height.......800-2800 ft agl until 1200, then 4400-6400 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy. Showers likely and chance of
thunderstorms in the evening, then chance of
showers and slight chance of thunderstorms
after midnight. Patchy fog after midnight.
Chance of precipitation 70 percent.
Chance of thunder...30 percent.
Min temperature.....45-50.
24 hr trend......3 degrees cooler.
Max humidity........85-91 percent.
24 hr trend......3 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Southwest winds around 10 mph until 2100, then
downslope/downvalley 4-7 mph. Gusts up to 20
mph.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.25 percent until 2400, then 5 percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......1400-3400 ft agl until 2400, then 600-800 ft
agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Partly cloudy. Slight chance of showers in the
morning. Chance of showers and slight chance of
thunderstorms in the afternoon. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....62-67.
24 hr trend......7 degrees cooler.
Min humidity........38-44 percent.
24 hr trend......Unchanged.
20-foot winds.......Upslope/upvalley 5-9 mph until 0900, then
southwest 10 to 15 mph with gusts to around 30
mph.
Ridge top winds.....Southwest around 10 mph until 1200, then around
20 mph.
Chc of wetting rain.Less than 5 percent.
Transport winds.....Southwest 15 to 20 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 6000-8000 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then very good.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Mostly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then chance of showers
after midnight. Lows in the lower 40s. Winds generally less than
10 mph.
.SUNDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows around 40. Highs around 60. Winds
generally less than 10 mph.
.MONDAY...Mostly clear. Lows in the lower 40s. Highs in the upper
60s. Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows in the mid 40s. Highs in the lower 70s.
Winds generally less than 10 mph.
.WEDNESDAY THROUGH THURSDAY...Mostly clear. Lows in the mid 40s.
Highs 70 to 75.
$$
WYZ300-190900-
Casper Mountain-
1250 AM MDT Fri Sep 18 2026
.TODAY...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms in the afternoon. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Max temperature.....70-75.
24 hr trend......8 degrees warmer.
Min humidity........44-50 percent.
24 hr trend......15 percent drier.
20-foot winds.......Southwest winds around 10 mph with gusts to
around 25 mph.
Ridge top winds.....Southwest around 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West around 15 mph.
Mixing Height.......1200-3200 ft agl until 1200, then 5000-6200 ft
agl.
Smoke dispersal.....Fair to good.
.TONIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Showers likely and chance of thunderstorms in
the evening, then chance of showers after
midnight. Patchy fog after midnight. Patchy fog
early in the morning. Chance of precipitation
70 percent.
Chance of thunder...30 percent.
Min temperature.....46-51.
24 hr trend......3 degrees cooler.
Max humidity........85-91 percent.
24 hr trend......5 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....South around 10 mph.
Chc of wetting rain.15 percent until 2400, then zero percent.
Transport winds.....South around 10 mph.
Mixing Height.......1200-3200 ft agl until 2400, then 400-800 ft
agl.
Smoke dispersal.....Poor.
.SATURDAY...
Sky/weather.........Partly cloudy. Slight chance of showers in the
late morning and early afternoon. Slight chance
of thunderstorms in the afternoon. Chance of
showers late in the afternoon. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....63-68.
24 hr trend......7 degrees cooler.
Min humidity........49-55 percent.
24 hr trend......4 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 0900, then
southwest around 10 mph. Gusts up to 20 mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.Zero percent until 1200, then 20 percent.
Transport winds.....Southwest 15 to 20 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 5800-7800 ft
agl.
Smoke dispersal.....Poor until 1200, then very good.
.Forecast days 3 through 7......
.SATURDAY NIGHT...Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then chance of showers
after midnight. Lows in the lower 40s. Winds generally less than
10 mph.
.SUNDAY...Cooler. Partly cloudy. Showers likely and slight chance
of thunderstorms. Lows around 40. Highs in the mid 50s. Winds
generally less than 10 mph.
.MONDAY...Mostly clear. Lows in the mid 40s. Highs in the lower
60s. Winds generally less than 10 mph.
.TUESDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the upper 40s. Highs in the upper 60s.
Winds generally less than 10 mph.
.WEDNESDAY THROUGH THURSDAY...Mostly clear. Lows in the mid 40s.
Highs 68 to 73.
$$