Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
536
FNUS75 KRIW 112059
FWSRIW
Spot Forecast for Bare...USFS
National Weather Service Riverton WY
259 PM MDT Tue Aug 11 2026
Forecast is based on forecast start time of 0600 MDT on August 12.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
A disturbance will keep temperatures cooler on Wednesday with
chances for showers and thunderstorms all day. Outside of any
outflows, wind will be lighter with gusts generally under 15 mph.
Outflow wind from this activity could bring gusts to 40 mph.
Humidity will be elevated given the increased moisture over the
area, though wetting rain chances remain low unless the fire
receives a direct hit from a cell. Shower chances increase
Wednesday night and especially Thursday. Cooler temperatures and
increased wetting rain chances are expected Thursday into the
weekend.
...Thunderstorms imply strong gusty and erratic winds...
.WEDNESDAY...
Sky/weather.........Mostly cloudy (75-85 percent) then becoming
mostly sunny (45-55 percent). Scattered showers
and thunderstorms.
CWR.................15 percent.
Chance of pcpn......80 percent.
Chance of thunder...32 percent.
Max temperature.....Around 70.
Min humidity........37 percent.
Wind (20 ft)........West to northwest 4 to 8 mph with gusts to
14 mph. Gusty and erratic winds expected near
any showers or thunderstorms.
Ridgetop wind.......West 10 to 15 mph.
Mixing height.......Increasing to 8000 ft AGL by 1400.
Transport winds.....West 12 to 14 mph.
Smoke dispersal.....Poor increasing to good after 1200.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........80 95 85 75 80 75 75 85 75 60 45 50
Weather cov.....ISO PTY ISO SCT SCT SCT ARS SCT NUM DEF NUM SCT
Weather type....RW SMK RW RW RW RW SMK RW RW RW RW RW
Tstm cov........ ISO SCT SCT SCT SCT SCT
CWR.............5 5 5 10 10 10 15 15 15 15 15 10
Chc of pcpn (%).20 20 20 30 30 30 20 40 70 80 70 40
Chc of thdr (%).10 10 10 15 15 15 25 30 30 30 30 30
Temp............58 57 56 58 62 64 65 67 68 68 68 69
RH..............45 51 54 56 53 49 44 40 37 37 40 40
20 FT wind dir..W W W NW W W W W W W NW N
20 FT wind spd..6 6 7 7 6 6 6 6 6 6 6 6
20 FT wind gust.11 13 14 14 11 11 11 11 12 12 12 11
Ridge wind dir..W W W NW W W W W W W NW N
Ridge wind spd..15 15 15 15 10 10 10 10 15 15 10 10
Mix hgt (kft)...0.5 0.5 0.5 1.5 3.5 5.0 6.0 7.5 8.0 7.0 6.5 6.0
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.13 13 14 14 12 12 12 12 13 13 12 12
SDspl kt-ft/10006 6 8 21 37 52 62 73 86 78 63 58
.WEDNESDAY NIGHT...
Sky/weather.........Mostly cloudy (70-80 percent). Scattered
showers and thunderstorms.
CWR.................3 percent.
Chance of pcpn......50 percent.
Chance of thunder...20 percent.
Min temperature.....Around 50.
Max humidity........86 percent.
Wind (20 ft)........Generally downslope 2 to 5 mph.
Ridgetop wind.......Generally west around 10 mph until 0200,
then south 5 to 10 mph.
Mixing height.......Decreasing to 500 ft after 2000.
Transport winds.....West 9 to 10 mph until 2000, then northeast
around 9 mph until 2100, then west until 2400,
then southwest 8 to 10 mph.
Smoke dispersal.....Poor after 1900.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........60 60 85 70 45 55 60 65 60 80 80 90
Weather cov.....SCT ISO ISO PTY PTY PTY CHC CHC CHC CHC
Weather type....RW RW RW SMK SMK SMK RW RW RW RW
Tstm cov........ISO ISO ISO SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).30 20 20 10 10 10 10 0 30 40 30 50
Chc of thdr (%).20 20 20 10 10 10 10 0 10 10 10 10
Temp............67 66 64 61 58 57 56 56 55 55 53 53
RH..............43 46 51 55 60 63 64 65 66 67 68 69
20 FT wind dir..N SE N NW W W W SW SW S S S
20 FT wind spd..5 4 4 4 4 4 3 3 3 3 2 2
20 FT wind gust.10 8 7 7 6 6 6 6 6 5 5 5
Ridge wind dir..N SE N NW W W W SW SW S S S
Ridge wind spd..10 10 10 10 10 10 10 10 10 10 5 5
Mix hgt (kft)...4.5 2.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.W W NE W SW SW SW W SW S SW W
Transp wind spd.10 9 9 9 9 9 8 8 8 9 10 9
SDspl kt-ft/100043 16 5 5 5 5 4 4 4 4 5 5
.THURSDAY...
Sky/weather.........Mostly cloudy (80-90 percent). Chance of
showers and thunderstorms all day.
CWR.................73 percent increasing to 96 percent in the
afternoon.
Chance of pcpn......100 percent.
Chance of thunder...51 percent.
Max temperature.....Around 61.
Min humidity........73 percent.
Wind (20 ft)........Generally favoring out of the southwest 4
to 6 mph. Gusty and erratic winds expected
near any showers or thunderstorms.
Ridgetop wind.......Light winds until 0700. West around 10 mph
after 0900.
Mixing height.......2000 ft AGL until 1100, then 4000 ft AGL.
Transport winds.....Southwest 8 to 12 mph.
Smoke dispersal.....Poor.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........90 90 85 80 80 80 80 85 85 90 85 85
Weather cov.....LKY LKY LKY LKY LKY LKY DEF DEF DEF DEF DEF DEF
Weather type....RW RW RW RW RW RW RW RW RW RW RW RW
Tstm cov........ SCH SCH SCH CHC CHC CHC CHC CHC CHC
CWR.............70 70 70 70 70 70 100 100 100 100 100 100
Chc of pcpn (%).70 70 70 70 70 70 100 100 100 100 100 100
Chc of thdr (%).10 10 10 10 10 10 50 50 50 50 50 50
Temp............53 50 51 52 54 56 58 59 60 60 60 59
RH..............73 82 86 86 86 85 83 79 75 73 75 78
20 FT wind dir..NW NE N NW W W SW SW SW SW SW W
20 FT wind spd..2 2 2 3 4 4 5 6 6 6 6 5
20 FT wind gust.5 5 6 6 7 8 10 10 11 11 11 12
Ridge wind dir..NW NE N NW W W SW SW SW SW SW W
Ridge wind spd..5 5 5 10 10 10 10 10 10 10 10 10
Mix hgt (kft)...0.5 0.5 1.0 1.0 2.0 3.0 4.0 4.0 4.0 4.0 3.5 3.0
Transp wind dir.SW S SW SW SW S S S SW SW SW SW
Transp wind spd.8 8 8 8 9 9 10 12 12 12 12 10
SDspl kt-ft/10004 4 6 9 17 25 36 39 39 38 35 28
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...
Showers likely and chance of thunderstorms. Lows in the mid 40s.
Highs in the lower 60s. Southwest winds 5 to 10 mph with gusts to
15 mph.
.SATURDAY...
Mostly cloudy. Chance of showers and thunderstorms. Lows in the
lower 40s. Highs in the mid 60s. Southwest winds 4 to 8 mph with
gusts to 12 mph.
.SUNDAY...
Partly cloudy. Lows in the mid 40s. Highs in the upper 60s. Southwest
winds 4 to 8 mph with gusts to 12 mph.
$$
Forecaster...Myers
Requested by...Stan Mitchem
Type of request...WILDFIRE
.TAG 2619432.0/RIW
.DELDT 08/11/26
.FormatterVersion 2.0.0
.EMAIL Stan@mitchem.com,paul_mitchem@firenet.gov