Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
568
FNUS55 KRIW 210730
FWFRIW
Fire Weather Planning Forecast for Western and Central Wyoming
National Weather Service Riverton WY
130 AM MDT Mon Sep 21 2026
.DISCUSSION...
...Yellowstone NP and Teton dispatch areas (includes fire weather
zones 140...414...415...and 416)...
Seasonable temperatures and relatively light winds expected for
Monday with humidity values above critical thresholds. Morning fog
possible, especially for zone 415, but no other weather impacts
expected for the remainder of the day. Shower activity returns
for Tuesday afternoon and evening with dry conditions expected
for the rest of the week.
...Cody dispatch area (includes fire weather zones 275...276...
282...283...285...286...287...288...and 289)...
Seasonable temperatures and relatively light winds expected for
Monday with humidity values above critical thresholds. Morning fog
possible, but no other weather impacts expected for the remainder
of the day. Shower activity returns for Tuesday afternoon and
evening with dry conditions expected for the rest of the week.
...Casper dispatch area (includes fire weather zones 277...278...
279...280...281...285...289...and 300)...
Seasonable temperatures and relatively light winds expected for
Monday with humidity values above critical thresholds. Morning fog
possible, especially for zone 280, but no other weather impacts
expected for the remainder of the day. Shower activity returns
for Tuesday afternoon and evening with dry conditions expected
for the rest of the week.
...Thunderstorms imply strong gusty and erratic winds...
WYZ280-220930-
Natrona County/Casper BLM-
Including the cities of Casper and Midwest
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Partly cloudy then becoming mostly sunny.
Patchy fog early in the morning.
Chance of thunder...0 percent.
Max temperature.....64-69.
24 hr trend......5 degrees warmer.
Min humidity........43-49 percent.
24 hr trend......23 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 10 mph
until 1200.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West around 10 mph.
Mixing Height.......600-2600 ft agl until 1200, then 3400-5400 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Mostly clear.
Chance of thunder...0 percent.
Min temperature.....42-47.
24 hr trend......Unchanged.
Max humidity........81-87 percent.
24 hr trend......10 percent drier.
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 20
mph.
Ridge top winds.....Southeast around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 10 mph.
Mixing Height.......1400-3400 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy then becoming mostly sunny.
Chance of thunder...0 percent.
Max temperature.....71-76.
24 hr trend......8 degrees warmer.
Min humidity........29-35 percent.
24 hr trend......15 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 0900, then
southwest around 10 mph. Gusts up to 15 mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph until 1200, then southwest
around 20 mph.
Mixing Height.......400-2400 ft agl until 1200, then 4800-6800 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then slight chance of
showers after midnight. Lows in the upper 40s. South winds around
10 mph.
.WEDNESDAY...Mostly clear. Lows in the mid 40s. Highs around 70.
West winds around 10 mph.
.THURSDAY...Partly cloudy. Lows in the upper 40s. Highs in the
mid 70s. Winds generally less than 10 mph.
.FRIDAY...Mostly clear. Lows around 50. Highs in the upper 70s.
Southwest winds around 10 mph.
.SATURDAY...Mostly clear. Slight chance of showers. Lows in the
upper 40s. Highs in the mid 70s.
.SUNDAY...Mostly sunny. Highs in the mid 70s.
$$
WYZ283-220930-
Upper Wind River Basin/Wind River Basin-
Including the cities of Crowheart, Lander, Riverton, and Shoshoni
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny. Areas of fog early in the
morning. Patchy fog early in the morning.
Chance of thunder...0 percent.
Max temperature.....61-66.
24 hr trend......2 degrees warmer.
Min humidity........49-55 percent.
24 hr trend......8 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....West around 5 mph until 1200, then southeast.
Chc of wetting rain.Zero percent.
Transport winds.....South 5 to 10 mph.
Mixing Height.......400-2400 ft agl until 1200, then 3000-4800 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Min temperature.....44-49.
24 hr trend......1 degree cooler.
Max humidity........74-80 percent.
24 hr trend......11 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 10
mph.
Ridge top winds.....East around 10 mph until 2400, then west.
Chc of wetting rain.Zero percent.
Transport winds.....East around 10 mph until 2400, then southwest.
Mixing Height.......1000-3000 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Max temperature.....65-70.
24 hr trend......4 degrees warmer.
Min humidity........43-49 percent.
24 hr trend......8 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph.
Ridge top winds.....South around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......200-2200 ft agl until 1200, then 3400-5400 ft
agl.
Smoke dispersal.....Poor until 1200, then fair to good.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then slight chance of
showers after midnight. Lows in the upper 40s. Southwest winds
around 10 mph.
.WEDNESDAY...Mostly clear. Lows in the upper 40s. Highs around
70. Winds generally less than 10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows around 50. Highs
73 to 78. Southwest winds around 10 mph.
.SATURDAY THROUGH SUNDAY...Mostly clear. Lows in the upper 40s.
Highs 73 to 78.
$$
WYZ285-220930-
South Bighorn Mountains-
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Max temperature.....58-63.
24 hr trend......6 degrees warmer.
Min humidity........49-55 percent.
24 hr trend......34 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 10 mph.
Ridge top winds.....West around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......600-2600 ft agl until 1200, then 3000-4600 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Mostly clear.
Chance of thunder...0 percent.
Min temperature.....43-48.
24 hr trend......1 degree warmer.
Max humidity........75-81 percent.
24 hr trend......18 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph until 2100, then
southeast around 10 mph until 0300, then
southwest. Gusts up to 15 mph.
Ridge top winds.....South 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South 10 to 15 mph.
Mixing Height.......800-2800 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....65-70.
24 hr trend......8 degrees warmer.
Min humidity........33-39 percent.
24 hr trend......19 percent drier.
20-foot winds.......Southwest winds around 10 mph and gusty.
Ridge top winds.....Southwest around 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 4600-6600 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then slight chance of
showers after midnight. Lows in the upper 40s. Southwest winds
around 10 mph.
.WEDNESDAY...Mostly clear. Lows in the upper 40s. Highs in the
mid 60s. Northwest winds around 10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows in the lower 50s.
Highs 68 to 73. Southwest winds around 10 mph.
.SATURDAY...Mostly clear. Slight chance of showers. Lows in the
upper 40s. Highs in the upper 60s.
.SUNDAY...Mostly sunny. Highs in the upper 60s.
$$
WYZ281-220930-
Johnson County/Casper BLM-
Including the cities of Buffalo and Kaycee
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Partly cloudy. Patchy fog early in the morning.
Chance of thunder...0 percent.
Max temperature.....60-65.
24 hr trend......6 degrees warmer.
Min humidity........55-61 percent.
24 hr trend......25 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 10 mph.
Ridge top winds.....West around 10 mph until 1200, then southeast.
Chc of wetting rain.Zero percent.
Transport winds.....North around 10 mph until 1200, then south.
Mixing Height.......600-2600 ft agl until 1200, then 3000-4600 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Mostly clear.
Chance of thunder...0 percent.
Min temperature.....46-51.
24 hr trend......2 degrees cooler.
Max humidity........83-89 percent.
24 hr trend......6 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph until 2100, then
south 10 to 15 mph. Gusts up to 25 mph.
Ridge top winds.....Southeast 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast 10 to 15 mph.
Mixing Height.......1200-3200 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy then becoming mostly sunny.
Chance of thunder...0 percent.
Max temperature.....69-74.
24 hr trend......9 degrees warmer.
Min humidity........29-35 percent.
24 hr trend......20 percent drier.
20-foot winds.......South winds around 10 mph with higher gusts.
Ridge top winds.....South around 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South around 15 mph.
Mixing Height.......400-2200 ft agl until 1200, then 4200-6200 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then slight chance of
showers after midnight. Lows in the lower 50s. South winds around
10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers. Lows in the
upper 40s. Highs in the mid 70s. Winds generally less than
10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows in the lower 50s.
Highs 77 to 82. Southwest winds 10 to 15 mph.
.SATURDAY...Mostly clear. Slight chance of showers. Lows in the
upper 40s. Highs in the mid 70s.
.SUNDAY...Mostly sunny. Highs in the mid 70s.
$$
WYZ282-220930-
South Bighorn Basin/Worland BLM-
Including the cities of Ten Sleep, Thermopolis, and Worland
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny. Areas of fog early in the
morning. Patchy fog early in the morning.
Chance of thunder...0 percent.
Max temperature.....61-66.
24 hr trend......6 degrees warmer.
Min humidity........44-50 percent.
24 hr trend......24 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph.
Ridge top winds.....South 5 to 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South 5 to 10 mph.
Mixing Height.......400-2400 ft agl until 1200, then 3000-4800 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Mostly clear.
Chance of thunder...0 percent.
Min temperature.....43-48.
24 hr trend......1 degree cooler.
Max humidity........74-80 percent.
24 hr trend......14 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph until 2100, then
southeast around 10 mph until 2400, then
downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....Southeast around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 10 mph.
Mixing Height.......1200-3200 ft agl until 2400, then 400 ft agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy then becoming mostly sunny.
Chance of thunder...0 percent.
Max temperature.....67-72.
24 hr trend......6 degrees warmer.
Min humidity........29-35 percent.
24 hr trend......14 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....South around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph.
Mixing Height.......400-2400 ft agl until 1200, then 4000-6000 ft
agl.
Smoke dispersal.....Poor to fair.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then chance of showers
after midnight. Lows in the lower 50s. Winds generally less than
10 mph.
.WEDNESDAY THROUGH FRIDAY...Mostly clear. Lows 47 to 52. Highs
75 to 80. South winds around 10 mph.
.SATURDAY...Mostly clear. Slight chance of showers. Lows in the
upper 40s. Highs in the upper 70s.
.SUNDAY...Mostly sunny. Highs in the mid 70s.
$$
WYZ275-220930-
North Bighorn Basin/Worland BLM-
Including the cities of Greybull, Lovell, and Powell
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Partly cloudy then becoming mostly sunny. Areas
of fog early in the morning. Patchy fog early
in the morning.
Chance of thunder...0 percent.
Max temperature.....59-64.
24 hr trend......5 degrees warmer.
Min humidity........42-48 percent.
24 hr trend......26 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....Southeast 5 to 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South 5 to 10 mph.
Mixing Height.......400-2200 ft agl until 1200, then 2800-4800 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Mostly clear.
Chance of thunder...0 percent.
Min temperature.....43-48.
24 hr trend......1 degree warmer.
Max humidity........71-77 percent.
24 hr trend......18 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....Southeast around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 10 mph.
Mixing Height.......1200-3200 ft agl until 2400, then 400 ft agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Max temperature.....66-71.
24 hr trend......6 degrees warmer.
Min humidity........26-32 percent.
24 hr trend......11 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then
southeast around 10 mph. Gusts up to 15 mph.
Ridge top winds.....Southeast around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph.
Mixing Height.......400-2400 ft agl until 1200, then 3400-5400 ft
agl.
Smoke dispersal.....Poor to fair.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Mostly cloudy with chance of showers and slight
chance of thunderstorms. Lows in the lower 50s. Winds generally
less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers. Lows in the
upper 40s. Highs in the lower 70s. Winds generally less than
10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows in the lower 50s.
Highs 77 to 82. South winds around 10 mph.
.SATURDAY...Partly cloudy. Lows in the mid 40s. Highs in the mid
70s.
.SUNDAY...Partly cloudy with slight chance of showers. Highs in
the lower 70s.
$$
WYZ276-220930-
Cody Foothills-
Including the cities of Clark, Cody, and Meeteetse
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....63-68.
24 hr trend......6 degrees warmer.
Min humidity........40-46 percent.
24 hr trend......15 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then east
around 10 mph. Gusts up to 15 mph.
Ridge top winds.....South around 10 mph until 1200, then east.
Chc of wetting rain.Zero percent.
Transport winds.....South 10 to 15 mph.
Mixing Height.......600-2600 ft agl until 1200, then 3200-5200 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly clear.
Chance of thunder...0 percent.
Min temperature.....46-51.
24 hr trend......1 degree warmer.
Max humidity........70-76 percent.
24 hr trend......16 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Southeast winds around 10 mph until 2100, then
downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....South around 10 mph until 2400, then southwest.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 10 mph until 2400, then
southwest.
Mixing Height.......1400-3400 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy. Slight chance of showers early
in the afternoon. Chance of showers 20 percent.
Chance of thunder...0 percent.
Max temperature.....67-72.
24 hr trend......5 degrees warmer.
Min humidity........32-38 percent.
24 hr trend......10 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
southeast around 10 mph. Gusts up to 15 mph.
Ridge top winds.....Southwest around 10 mph until 1200, then
southeast.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 5200-7200 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Mostly cloudy with chance of showers and slight
chance of thunderstorms. Lows in the lower 50s. Winds generally
less than 10 mph.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the upper 40s. Highs around 70. Winds
generally less than 10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows in the lower 50s.
Highs 74 to 79. Southwest winds around 10 mph.
.SATURDAY...Partly cloudy. Lows in the mid 40s. Highs in the
lower 70s.
.SUNDAY...Partly cloudy with slight chance of showers. Highs in
the upper 60s.
$$
WYZ287-220930-
Owl Creek Mountains-
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....59-64.
24 hr trend......4 degrees warmer.
Min humidity........51-57 percent.
24 hr trend......17 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then south
around 10 mph. Gusts up to 15 mph.
Ridge top winds.....Southwest around 10 mph until 1200, then south.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph.
Mixing Height.......600-2600 ft agl until 1200, then 3200-4800 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly clear.
Chance of thunder...0 percent.
Min temperature.....43-48.
24 hr trend......Unchanged.
Max humidity........72-78 percent.
24 hr trend......13 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph.
Mixing Height.......1000-3000 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Max temperature.....63-68.
24 hr trend......6 degrees warmer.
Min humidity........40-46 percent.
24 hr trend......13 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then
southeast around 10 mph until 1500, then
upslope/upvalley 5-9 mph. Gusts up to 15 mph.
Ridge top winds.....South around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......600-2600 ft agl until 1200, then 4200-6200 ft
agl.
Smoke dispersal.....Poor to fair.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then chance of showers
after midnight. Lows in the upper 40s. Winds generally less than
10 mph.
.WEDNESDAY THROUGH FRIDAY...Mostly clear. Lows 48 to 53. Highs
68 to 73. Southwest winds around 10 mph.
.SATURDAY...Mostly clear. Lows in the upper 40s. Highs around 70.
.SUNDAY...Partly cloudy. Highs in the upper 60s.
$$
WYZ286-220930-
Absaroka Mountains/North Shoshone NF-
Including the city of Pahaska
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....57-62.
24 hr trend......5 degrees warmer.
Min humidity........43-49 percent.
24 hr trend......16 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
southeast around 10 mph. Gusts up to 15 mph.
Ridge top winds.....West around 10 mph until 1200, then south.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 3600-5600 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Min temperature.....39-44.
24 hr trend......2 degrees warmer.
Max humidity........76-82 percent.
24 hr trend......18 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....South around 10 mph until 2400, then west.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph until 2400, then west.
Mixing Height.......1000-3000 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy. Chance of showers and slight
chance of thunderstorms late in the afternoon.
Chance of precipitation 40 percent.
Chance of thunder...10 percent.
Max temperature.....60-65.
24 hr trend......3 degrees warmer.
Min humidity........34-40 percent.
24 hr trend......9 percent drier.
20-foot winds.......West winds around 10 mph until 0900, then
upslope/upvalley 5-9 mph until 1200, then
southwest around 10 mph. Gusts up to 15 mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West around 15 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 5400-7400 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.Forecast days 3 through 7......
.TUESDAY 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.
.WEDNESDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the lower 40s. Highs in the upper 50s.
West winds around 10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows in the mid 40s.
Highs in the mid 60s. West winds 10 to 15 mph.
.SATURDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows around 40. Highs in the lower 60s.
.SUNDAY...Partly cloudy. Slight chance of showers in the morning,
then chance of showers and slight chance of thunderstorms in the
afternoon. Highs in the upper 50s.
$$
WYZ140-220930-
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny. Areas of fog early in the
morning.
Chance of thunder...0 percent.
Max temperature.....61-66.
24 hr trend......7 degrees warmer.
Min humidity........34-40 percent.
24 hr trend......23 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....Southeast around 5 mph until 1200, then
southwest.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 5 mph until 1200, then
southwest.
Mixing Height.......800-2800 ft agl until 1200, then 4000-6000 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Min temperature.....35-40.
24 hr trend......1 degree warmer.
Max humidity........80-86 percent.
24 hr trend......6 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....Southwest around 5 mph until 2400, then
southeast.
Chc of wetting rain.Zero percent.
Transport winds.....South 5 to 10 mph.
Mixing Height.......1600-3600 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Chance of thunder...0 percent.
Max temperature.....61-66.
24 hr trend......1 degree warmer.
Min humidity........32-38 percent.
24 hr trend......3 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph.
Ridge top winds.....South around 10 mph until 1200, then southwest.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......1200-3200 ft agl until 1200, then 5400-7400 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.Forecast days 3 through 7......
.TUESDAY 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.
.WEDNESDAY...Mostly clear. Lows in the upper 30s. Highs around
60. Winds generally less than 10 mph.
.THURSDAY...Clear. Lows around 40. Highs in the mid 60s. Winds
generally less than 10 mph.
.FRIDAY...Mostly clear. Lows in the upper 30s. Highs in the mid
60s. South winds around 10 mph.
.SATURDAY THROUGH SUNDAY...Partly cloudy with slight chance of
showers and thunderstorms. Lows in the mid 30s. Highs 57 to 62.
$$
WYZ415-220930-
North Zone Bridger Teton NF and Grand Teton NP-
Including the cities of Jackson and Moran
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny. Areas of fog early in the
morning.
Chance of thunder...0 percent.
Max temperature.....58-63.
24 hr trend......6 degrees warmer.
Min humidity........40-46 percent.
24 hr trend......21 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 10 mph.
Ridge top winds.....Southeast around 10 mph until 1200, then
southwest.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 10 mph until 1200, then
southwest.
Mixing Height.......800-2800 ft agl until 1200, then 3800-5800 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Min temperature.....35-40.
24 hr trend......2 degrees warmer.
Max humidity........77-83 percent.
24 hr trend......16 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 10
mph.
Ridge top winds.....South around 10 mph until 2400, then southeast.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph.
Mixing Height.......1600-3600 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy then becoming mostly cloudy.
Slight chance of showers late in the afternoon.
Slight chance of thunderstorms late in the
afternoon. Chance of showers late in the
afternoon. Chance of precipitation 40 percent.
Chance of thunder...20 percent.
Max temperature.....56-61.
24 hr trend......Unchanged.
Min humidity........42-48 percent.
24 hr trend......1 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 10 mph.
Ridge top winds.....Southeast around 10 mph until 1200, then
southwest.
Chc of wetting rain.Zero percent.
Transport winds.....South 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 4200-6200 ft
agl.
Smoke dispersal.....Poor to fair.
.Forecast days 3 through 7......
.TUESDAY 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.
.WEDNESDAY...Mostly clear. Lows in the upper 30s. Highs around
60. Winds generally less than 10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows in the lower 40s.
Highs 63 to 68. South winds around 10 mph.
.SATURDAY...Partly cloudy. Slight chance of showers and
thunderstorms. Lows in the upper 30s. Highs in the lower 60s.
.SUNDAY...Partly cloudy. Chance of showers in the morning, then
chance of showers and slight chance of thunderstorms in the
afternoon. Highs in the upper 50s.
$$
WYZ416-220930-
West Wind River Mountains/East Zone Bridger Teton NF-
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny. Areas of fog early in the
morning.
Chance of thunder...0 percent.
Max temperature.....53-58.
24 hr trend......3 degrees warmer.
Min humidity........44-50 percent.
24 hr trend......10 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph.
Ridge top winds.....South 5 to 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South 5 to 10 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 3800-5400 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Min temperature.....36-41.
24 hr trend......3 degrees warmer.
Max humidity........73-79 percent.
24 hr trend......24 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 10
mph.
Ridge top winds.....Southeast around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph.
Mixing Height.......1600-3600 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy. Slight chance of showers late in
the afternoon. Slight chance of thunderstorms
late in the afternoon. Chance of showers late
in the afternoon. Chance of precipitation 40
percent.
Chance of thunder...20 percent.
Max temperature.....54-59.
24 hr trend......1 degree warmer.
Min humidity........45-51 percent.
24 hr trend......Unchanged.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then
southwest around 10 mph. Gusts up to 15 mph.
Ridge top winds.....South 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South 10 to 15 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 4600-6600 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.Forecast days 3 through 7......
.TUESDAY 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.
.WEDNESDAY...Mostly clear. Lows in the upper 30s. Highs in the
upper 50s. Winds generally less than 10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows in the upper 30s.
Highs around 60. Southwest winds around 10 mph.
.SATURDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the upper 30s. Highs in the upper 50s.
.SUNDAY...Partly cloudy. Slight chance of showers in the morning,
then chance of showers and slight chance of thunderstorms in the
afternoon. Highs in the upper 50s.
$$
WYZ288-220930-
East Wind River Mountains/South Shoshone NF-
Including the cities of Dubois and South Pass
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny. Patchy fog early in the morning.
Chance of thunder...0 percent.
Max temperature.....54-59.
24 hr trend......4 degrees warmer.
Min humidity........51-57 percent.
24 hr trend......18 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph.
Ridge top winds.....Southwest around 10 mph until 1200, then south.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......800-2800 ft agl until 1200, then 3400-5400 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Min temperature.....37-42.
24 hr trend......2 degrees warmer.
Max humidity........70-76 percent.
24 hr trend......27 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......1200-3200 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms late in the afternoon. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Max temperature.....57-62.
24 hr trend......3 degrees warmer.
Min humidity........42-48 percent.
24 hr trend......6 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then
southwest around 10 mph. Gusts up to 20 mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest 15 to 20 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 4800-6800 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then good to very
good.
.Forecast days 3 through 7......
.TUESDAY 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. Southwest winds around
10 mph.
.WEDNESDAY...Mostly clear. Lows around 40. Highs in the upper
50s. Winds generally less than 10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows in the mid 40s.
Highs in the mid 60s. Southwest winds around 10 mph.
.SATURDAY...Partly cloudy. Slight chance of showers and
thunderstorms. Lows in the lower 40s. Highs in the lower 60s.
.SUNDAY...Partly cloudy. Slight chance of showers in the morning,
then chance of showers and slight chance of thunderstorms in the
afternoon. Highs in the lower 60s.
$$
WYZ414-220930-
Salt and Wyoming Ranges/West Zone Bridger Teton NF-
Including the city of Afton
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny. Areas of fog early in the
morning.
Chance of thunder...0 percent.
Max temperature.....58-63.
24 hr trend......5 degrees warmer.
Min humidity........37-43 percent.
24 hr trend......19 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph.
Ridge top winds.....Southeast around 10 mph until 1200, then
southwest.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 10 mph until 1200, then
southwest.
Mixing Height.......1000-3000 ft agl until 1200, then 4200-6200 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Min temperature.....37-42.
24 hr trend......4 degrees warmer.
Max humidity........73-79 percent.
24 hr trend......26 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....South around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph.
Mixing Height.......1600-3600 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Mostly cloudy. Slight chance of showers early
in the afternoon. Slight chance of
thunderstorms early in the afternoon. Chance of
showers late in the afternoon. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....55-60.
24 hr trend......3 degrees cooler.
Min humidity........43-49 percent.
24 hr trend......7 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 10 mph.
Ridge top winds.....South around 10 mph until 1200, then southwest.
Chc of wetting rain.Less than 5 percent.
Transport winds.....South 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 3800-5800 ft
agl.
Smoke dispersal.....Poor to fair.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Showers likely and slight chance
of thunderstorms in the evening, then chance of showers after
midnight. Lows around 40. Winds generally less than 10 mph.
.WEDNESDAY...Mostly clear. Lows around 40. Highs in the lower
60s. Winds generally less than 10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows in the lower 40s.
Highs in the mid 60s. South winds around 10 mph.
.SATURDAY THROUGH SUNDAY...Partly cloudy with slight chance of
showers and thunderstorms. Lows in the lower 40s. Highs in the
lower 60s.
$$
WYZ278-220930-
Upper Green River Basin/Rock Springs BLM-
Including the cities of Big Piney, Farson, and Pinedale
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny. Patchy fog early in the morning.
Areas of fog early in the morning, then patchy
fog early in the morning.
Chance of thunder...0 percent.
Max temperature.....57-62.
24 hr trend......2 degrees warmer.
Min humidity........37-43 percent.
24 hr trend......6 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 10 mph.
Ridge top winds.....Northeast around 10 mph until 1200, then south.
Chc of wetting rain.Zero percent.
Transport winds.....East around 10 mph until 1200, then southwest.
Mixing Height.......800-2800 ft agl until 1200, then 4000-6000 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Min temperature.....37-42.
24 hr trend......1 degree warmer.
Max humidity........73-79 percent.
24 hr trend......16 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 10
mph.
Ridge top winds.....Southeast around 10 mph until 2400, then
northeast.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 10 mph until 2400, then east.
Mixing Height.......1800-3800 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy. Slight chance of showers late in
the afternoon. Slight chance of thunderstorms
late in the afternoon. Chance of showers late
in the afternoon. Chance of precipitation 50
percent.
Chance of thunder...20 percent.
Max temperature.....56-61.
24 hr trend......1 degree cooler.
Min humidity........41-47 percent.
24 hr trend......7 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph.
Ridge top winds.....Northeast around 5 mph until 1200, then
southwest.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 10 mph until 1200, then
southwest.
Mixing Height.......800-2800 ft agl until 1200, then 4400-6400 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly 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.
.WEDNESDAY...Mostly clear. Lows in the upper 30s. Highs in the
mid 60s. Winds generally less than 10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows around 40. Highs
67 to 72. Winds generally less than 10 mph.
.SATURDAY THROUGH SUNDAY...Partly cloudy with slight chance of
showers and thunderstorms. Lows in the upper 30s. Highs in the
upper 60s.
$$
WYZ277-220930-
Lincoln and Uinta Counties/Lower Elevations-
Including the cities of Evanston, Fort Bridger, and Kemmerer
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny. Patchy fog early in the morning.
Chance of thunder...0 percent.
Max temperature.....60-65.
24 hr trend......3 degrees warmer.
Min humidity........32-38 percent.
24 hr trend......9 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 10 mph.
Ridge top winds.....Northeast around 10 mph until 1200, then
southwest.
Chc of wetting rain.Zero percent.
Transport winds.....East around 10 mph until 1200, then southwest.
Mixing Height.......600-2600 ft agl until 1200, then 3600-5600 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Min temperature.....39-44.
24 hr trend......2 degrees warmer.
Max humidity........71-77 percent.
24 hr trend......20 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....Northeast around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 10 mph.
Mixing Height.......1800-3800 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Mostly cloudy. Chance of showers and
thunderstorms in the afternoon. Chance of
precipitation 50 percent.
Chance of thunder...30 percent.
Max temperature.....58-63.
24 hr trend......2 degrees cooler.
Min humidity........45-51 percent.
24 hr trend......14 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....North around 5 mph until 1200, then southwest.
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 until 1200, then fair to good.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then slight chance of
showers after midnight. Lows in the upper 30s. Winds generally
less than 10 mph.
.WEDNESDAY...Mostly clear. Lows around 40. Highs in the mid 60s.
Winds generally less than 10 mph.
.THURSDAY THROUGH FRIDAY...Mostly clear. Lows in the lower 40s.
Highs 68 to 73. Winds generally less than 10 mph.
.SATURDAY...Mostly clear. Lows in the lower 40s. Highs in the
upper 60s.
.SUNDAY...Partly cloudy. Slight chance of showers and
thunderstorms in the afternoon. Highs in the upper 60s.
$$
WYZ279-220930-
Sweetwater County/Rock Springs BLM/Flaming Gorge NRA-
Including the cities of Green River, Rock Springs, and Wamsutter
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Partly cloudy then becoming mostly sunny.
Patchy fog early in the morning. Areas of fog
early in the morning, then patchy fog early in
the morning.
Chance of thunder...0 percent.
Max temperature.....61-66.
24 hr trend......3 degrees warmer.
Min humidity........37-43 percent.
24 hr trend......6 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 10 mph.
Ridge top winds.....East around 5 mph until 1200, then southwest.
Chc of wetting rain.Zero percent.
Transport winds.....East around 5 mph until 1200, then southwest.
Mixing Height.......600-2600 ft agl until 1200, then 4000-6000 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Min temperature.....43-48.
24 hr trend......Unchanged.
Max humidity........69-75 percent.
24 hr trend......17 percent drier.
Humidity recovery...Good.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....Southeast 5 to 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 10 mph.
Mixing Height.......2000-4000 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy. Chance of showers and slight
chance of thunderstorms late in the afternoon.
Chance of precipitation 50 percent.
Chance of thunder...10 percent.
Max temperature.....62-67.
24 hr trend......1 degree warmer.
Min humidity........43-49 percent.
24 hr trend......8 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then
southwest 10 to 15 mph with gusts to around 25
mph.
Ridge top winds.....South around 10 mph until 1200, then southwest
around 20 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph until 1200, then southwest
around 20 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 5200-7200 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then slight chance of
showers after midnight. Lows in the lower 40s. Winds generally
less than 10 mph.
.WEDNESDAY...Mostly clear. Lows in the lower 40s. Highs in the
mid 60s. Winds generally less than 10 mph.
.THURSDAY...Partly cloudy. Lows in the mid 40s. Highs around 70.
Winds generally less than 10 mph.
.FRIDAY...Mostly clear. Lows in the mid 40s. Highs in the lower
70s. Southwest winds around 10 mph.
.SATURDAY THROUGH SUNDAY...Partly cloudy with slight chance of
showers and thunderstorms. Lows in the mid 40s. Highs in the
lower 70s.
$$
WYZ289-220930-
Granite/Green/Ferris/Rattlesnake Mountains-
Including the city of Jeffrey City
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Mostly sunny. Patchy fog early in the morning.
Areas of fog early in the morning.
Chance of thunder...0 percent.
Max temperature.....60-65.
24 hr trend......4 degrees warmer.
Min humidity........38-44 percent.
24 hr trend......18 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....East around 5 mph until 1200, then southwest.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 5 mph until 1200, then
southwest.
Mixing Height.......600-2600 ft agl until 1200, then 4000-6000 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Partly cloudy.
Chance of thunder...0 percent.
Min temperature.....42-47.
24 hr trend......Unchanged.
Max humidity........71-77 percent.
24 hr trend......18 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....Southeast around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 10 mph.
Mixing Height.......2000-4000 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms late in the afternoon. Chance of
precipitation 20 percent.
Chance of thunder...0 percent.
Max temperature.....66-71.
24 hr trend......4 degrees warmer.
Min humidity........33-39 percent.
24 hr trend......2 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then
southwest around 15 mph with gusts to around 25
mph.
Ridge top winds.....South around 10 mph until 1200, then southwest
around 20 mph.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph until 1200, then southwest
around 20 mph.
Mixing Height.......800-2800 ft agl until 1200, then 5600-7600 ft
agl.
Smoke dispersal.....Poor until 1200, then very good.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening, then slight chance of
showers after midnight. Lows in the mid 40s. Southwest winds
around 10 mph.
.WEDNESDAY...Mostly clear. Lows in the mid 40s. Highs in the
upper 60s. Winds generally less than 10 mph.
.THURSDAY...Partly cloudy. Lows in the mid 40s. Highs around 70.
Winds generally less than 10 mph.
.FRIDAY...Mostly clear. Lows in the upper 40s. Highs in the lower
70s. Southwest winds around 10 mph.
.SATURDAY...Partly cloudy. Slight chance of showers and
thunderstorms. Lows in the mid 40s. Highs in the lower 70s.
.SUNDAY...Partly cloudy. Highs in the lower 70s.
$$
WYZ300-220930-
Casper Mountain-
130 AM MDT Mon Sep 21 2026
.TODAY...
Sky/weather.........Partly cloudy then becoming mostly sunny.
Patchy fog early in the morning.
Chance of thunder...0 percent.
Max temperature.....59-64.
24 hr trend......7 degrees warmer.
Min humidity........48-54 percent.
24 hr trend......40 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 10 mph.
Ridge top winds.....West around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West around 10 mph.
Mixing Height.......800-2800 ft agl until 1200, then 4000-5400 ft
agl.
Smoke dispersal.....Poor.
.TONIGHT...
Sky/weather.........Mostly clear.
Chance of thunder...0 percent.
Min temperature.....42-47.
24 hr trend......3 degrees warmer.
Max humidity........76-82 percent.
24 hr trend......17 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph until 2100, then
southeast around 10 mph. Gusts up to 20 mph.
Ridge top winds.....Southeast 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southeast around 15 mph.
Mixing Height.......1200-3200 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Poor.
.TUESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....67-72.
24 hr trend......8 degrees warmer.
Min humidity........32-38 percent.
24 hr trend......14 percent drier.
20-foot winds.......South winds around 10 mph until 1200, then
southwest. Gusts up to 15 mph.
Ridge top winds.....South around 15 mph until 1200, then southwest.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest 15 to 20 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 6400-8400 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then very good.
.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Lows in the upper 40s. South
winds around 10 mph.
.WEDNESDAY...Mostly clear. Lows in the mid 40s. Highs in the mid
60s. Southwest winds around 10 mph.
.THURSDAY...Partly cloudy. Lows in the upper 40s. Highs in the
upper 60s. Winds generally less than 10 mph.
.FRIDAY...Mostly clear. Lows around 50. Highs around 70.
Southwest winds around 10 mph.
.SATURDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the upper 40s. Highs around 70.
.SUNDAY...Partly cloudy. Slight chance of showers and
thunderstorms in the afternoon. Highs in the upper 60s.
$$