Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
Versions:
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FNUS75 KRIW 141650
FWSRIW
Spot Forecast for Grouse Mountain RX...USFS
National Weather Service Riverton WY
1050 AM MDT Tue Oct 14 2025
Forecast is based on ignition time of 0000 MDT on October 15.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
An incoming weather system will cause cloud cover to persist
Wednesday into Thursday. Multiple periods of rain and snow
likely over the next 48 hours, with snow primarily in the late
overnight and early morning hours. Isolated thunderstorms cannot
be ruled out for Wednesday afternoon, with a 20% chance of a storm
affecting the area near your piles. After a few wet days with
high chances precipitation, a mostly dry forecast is in place for
Friday through the weekend.
...Thunderstorms imply strong gusty and erratic winds...
.REST OF TONIGHT...
Sky/weather.........Partly cloudy (45-55 percent) then becoming
mostly cloudy (70-80 percent). Chance of rain
showers overnight, then rain showers likely
after 3 am.
CWR.................27 percent.
Chance of pcpn......60 percent.
Chance of thunder...9 percent.
Min temperature.....Around 33.
Max humidity........93 percent.
Wind (20 ft)........Southeast winds 9 to 10 mph with gusts to
around 16 mph.
Ridgetop wind.......Southeast around 15 mph.
Mixing height.......500 ft AGL.
Transport winds.....Southeast 16 to 17 mph.
Smoke dispersal.....Poor.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P
Sky (%).........45 50 65 70 85 80
Weather cov.....CHC CHC CHC LKY LKY LKY
Weather type....RW RW RW RW RW RW
Tstm cov........
CWR.............30 30 30 30 30 30
Chc of pcpn (%).50 50 50 60 60 60
Chc of thdr (%).10 10 10 10 10 10
Temp............34 34 34 34 35 35
RH..............84 85 85 85 88 86
20 FT wind dir..SE SE SE SE SE SE
20 FT wind spd..10 10 9 10 10 9
20 FT wind gust.16 16 14 16 16 14
Ridge wind dir..SE SE SE SE SE SE
Ridge wind spd..15 15 15 15 15 15
Mix hgt (kft)...0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.S SE SE SE SE SE
Transp wind spd.17 17 16 17 17 16
SDspl kt-ft/10004 5 4 5 6 4
.WEDNESDAY...
Sky/weather.........Mostly cloudy (70-80 percent). Rain showers
likely in the morning, then rain showers, snow
showers and slight chance of thunderstorms in
the afternoon.
CWR.................71 percent increasing to 85 percent in the
afternoon.
Chance of pcpn......90 percent.
Chance of thunder...24 percent.
Max temperature.....Around 43.
Min humidity........82 percent.
Wind (20 ft)........Southeast winds around 7 mph until 0700, then
light. Gusty and erratic winds expected near
thunderstorms in the afternoon.
Ridgetop wind.......South 10 to 15 mph until 1700, then southwest.
Mixing height.......1500 ft AGL until 1000, then 4000 ft AGL until
1500, then 4500 ft AGL until 1700, then 2500 ft
AGL.
Transport winds.....South 13 to 20 mph until 1700, then west around
10 mph.
Smoke dispersal.....Poor until 1100, then fair early in the morning
increasing to good in the afternoon until 1700,
then poor.
TIME (MDT) MID 1AM 2AM 3AM 4AM 5AM 6AM 7AM 8AM 9AM 10A 11A
Sky (%).........75 70 70 70 65 65 65 70 70 75 75 80
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 SW
Tstm cov........ SCH SCH SCH SCH SCH SCH
CWR.............70 70 70 70 70 70 90 90 90 90 90 90
Chc of pcpn (%).70 70 70 70 70 70 90 90 90 90 90 90
Chc of thdr (%).10 10 10 10 10 10 20 20 20 20 20 20
Temp............34 33 33 35 41 43 43 42 42 41 40 38
RH..............88 92 93 93 87 83 83 82 82 83 85 88
20 FT wind dir..SE SE SE SE S S S S S SW SW SW
20 FT wind spd..7 6 6 5 5 5 5 5 5 5 4 3
20 FT wind gust.11 10 8 7 7 7 7 7 7 7 6
Ridge wind dir..SE SE SE SE S S S S S SW SW SW
Ridge wind spd..15 15 10 10 10 10 10 10 10 10 10 10
Mix hgt (kft)...0.5 0.5 1.0 1.5 2.5 3.0 3.5 4.0 4.0 4.5 3.5 2.5
Transp wind dir.SE SE S S S S S S S S SW W
Transp wind spd.15 14 13 14 16 18 20 18 18 17 14 10
SDspl kt-ft/10004 6 11 18 33 47 60 61 66 66 41 21
.WEDNESDAY NIGHT...
Sky/weather.........Cloudy (85-95 percent). Slight chance of
thunderstorms in the evening. Snow showers
through the night.
CWR.................82 percent.
Chance of pcpn......80 percent.
Chance of thunder...15 percent.
Min temperature.....Around 28.
Max humidity........96 percent.
Wind (20 ft)........Light winds. Gusty and erratic winds expected
near thunderstorms in the evening.
Ridgetop wind.......Light winds until 2300. West around 10 mph
after 0500.
Mixing height.......500 ft AGL.
Transport winds.....West 7 to 10 mph until 0300, then northwest 10
to 12 mph.
Smoke dispersal.....Poor.
TIME (MDT) 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM 10P 11P
Sky (%).........85 85 85 85 85 85 90 90 90 95 95 95
Weather cov.....DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF
Weather type....SW SW SW SW SW SW SW SW SW SW SW SW
Tstm cov........SCH SCH SCH SCH SCH SCH
CWR.............80 80 80 80 80 80 80 80 80 80 80 80
Chc of pcpn (%).80 80 80 80 80 80 80 80 80 80 80 80
Chc of thdr (%).20 20 20 20 20 20 10 10 10 10 10 10
Temp............36 34 33 32 31 31 31 31 31 31 31 31
RH..............92 94 94 95 94 93 92 92 91 91 89 88
20 FT wind dir..SW W W NW NW NW NW NW W W W W
20 FT wind spd..2 2 2 2 2 2 2 2 2 2 2 3
20 FT wind gust.
Ridge wind dir..SW W W NW NW NW NW NW W W W W
Ridge wind spd..5 5 5 5 5 5 5 5 5 5 5 10
Mix hgt (kft)...1.5 1.5 1.0 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0.5
Transp wind dir.W W W W W W W W NW NW NW NW
Transp wind spd.7 7 7 7 7 8 9 10 10 12 12 10
SDspl kt-ft/10008 8 7 6 6 6 6 7 6 6 6 6
.THURSDAY...
Sky/weather.........Cloudy (90-100 percent). Snow showers.
CWR.................84 percent.
Chance of pcpn......80 percent.
Chance of thunder...9 percent.
Max temperature.....Around 33.
Min humidity........88 percent.
Wind (20 ft)........Light winds.
Ridgetop wind.......West around 10 mph.
Mixing height.......2000 ft AGL until 1200, then 2500 ft AGL.
Transport winds.....Northwest 9 to 10 mph until 0900, then west 9
to 15 mph.
Smoke dispersal.....Poor.
TIME (MDT) MID 1AM 2AM 3AM 4AM 5AM 6AM 7AM 8AM 9AM 10A 11A
Sky (%).........90 90 90 90 90 90 90 90 95 95 95 90
Weather cov.....DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF
Weather type....SW SW SW SW SW SW SW SW SW SW SW SW
Tstm cov........
CWR.............80 80 80 80 80 80 80 80 80 80 80 80
Chc of pcpn (%).80 80 80 80 80 80 80 80 80 80 80 80
Chc of thdr (%).10 10 10 10 10 10 10 10 10 10 10 10
Temp............31 30 28 28 29 31 32 33 33 32 32 31
RH..............89 91 94 96 91 90 90 90 90 91 91 91
20 FT wind dir..W W W W W W W W W W W W
20 FT wind spd..3 3 4 4 4 5 5 5 5 5 5 5
20 FT wind gust. 6 6 6 7 7 7 7 7 7 7
Ridge wind dir..W W W W W W W W W W W W
Ridge wind spd..10 10 10 10 10 10 10 10 10 10 10 10
Mix hgt (kft)...0.5 0.5 1.0 1.0 1.5 2.0 2.5 2.5 2.5 2.5 2.0 1.5
Transp wind dir.NW NW W W W W W W W W W W
Transp wind spd.10 10 9 9 10 10 12 13 14 15 15 15
SDspl kt-ft/10006 7 7 8 13 18 24 28 31 34 28 21
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...
Mostly cloudy. Slight chance of snow showers. Lows in the mid 20s.
Highs in the mid 30s. Light winds.
.SATURDAY...
Partly cloudy. Lows in the mid 20s. Highs in the upper 30s.
Light winds.
.SUNDAY...
Mostly clear. Lows in the mid 20s. Highs in the mid 40s. Light
winds.
$$
Forecaster...VandenBoogart
Requested by...Paul Hood
Type of request...PRESCRIBED
.TAG 2523564.0/RIW
.DELDT 10/14/25
.FormatterVersion 2.0.0
.EMAIL eric.hawes@usda.gov,paul_hood@nps.gov,patrick.tenney@usda.gov,Eli.Berman@usda.gov