Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
318
FNUS75 KRIW 051304
FWSRIW
Spot Forecast for Wiggins A1E-F...USFS
National Weather Service Riverton WY
604 AM MST Fri Dec 5 2025
Forecast is based on ignition time of 0700 MST on December 05.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Snow will gradually be ending between 0700L and 0900L. There is high
confidence that snow chances will be minimal (less than 10%) from
0900L though 1500L/1600L; however, a few flurries cannot be
completely ruled out. During this time, expect periodic breaks in
cloud cover, good mixing and smoke dispersal, and gusty northwest
winds after 1000L with frequent gusts of 20 to 30 mph. Moderate to
heavy snow is forecast to begin after 1600L and continue through
Saturday morning. Overnight snow amounts of 5 to 7 inches expected
through sunrise Saturday. Winds will become westerly as well with
overnight gusts around 35 to 45 mph. These gusty winds continue on
Saturday with light snow chances.
...Thunderstorms imply strong gusty and erratic winds...
.TODAY...
Sky/weather.........Mostly sunny (35-45 percent) then becoming
mostly cloudy (70-80 percent). Slight chance of
snow showers early in the morning. Chance of
moderate to heavy snow showers in the afternoon.
CWR.................2 percent increasing to 86 percent late in the
afternoon.
Chance of pcpn......70 percent.
Max temperature.....Around 31.
Min humidity........59 percent.
Wind (20 ft)........Light winds until 1000, then west 8 to 13 mph
with gusts to around 22 mph.
Ridgetop wind.......West 15 to 20 mph.
Mixing height.......2500 ft AGL until 1100, then increasing to 4000
ft AGL until 1600, then decreasing to 2000 ft
AGL.
Transport winds.....West 13 to 20 mph until 1200, then 20 to 28
mph.
Smoke dispersal.....Poor until 1100, then good until 1600, then
poor.
TIME (MST) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........50 40 30 30 25 30 35 40 35 50 75
Weather cov.....SCH CHC LKY
Weather type....SW SW SW
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 90
Chc of pcpn (%).20 10 10 0 0 0 0 10 10 40 70
Temp............21 21 24 27 28 29 30 29 28 27 26
RH..............91 87 83 74 68 64 59 60 62 66 69
20 FT wind dir..W W W W W W W W W W W
20 FT wind spd..6 6 6 8 10 12 13 13 13 13 12
20 FT wind gust.12 12 13 16 18 20 21 22 22 22 20
Ridge wind dir..W W W W W W W W W W W
Ridge wind spd..15 15 15 15 15 20 20 20 20 20 20
Mix hgt (kft)...1.0 1.0 1.5 2.5 3.5 4.0 4.0 4.0 3.0 2.0 1.5
Transp wind dir.W W NW W W W W W W W W
Transp wind spd.14 13 14 16 20 24 24 26 28 21 20
SDspl kt-ft/100012 12 19 36 61 84 84 92 76 32 24
.TONIGHT...
Sky/weather.........Mostly cloudy (75-85 percent). Snow showers in
the evening and overnight.
CWR.................86 percent decreasing to 60 percent early in
the morning.
Chance of pcpn......90 percent.
Min temperature.....Around 25.
Max humidity........79 percent.
Wind (20 ft)........West winds 11 to 17 mph. Gusts up to 33 mph
increasing to 43 mph overnight.
Ridgetop wind.......West 20 to 25 mph.
Mixing height.......1000 ft AGL.
Transport winds.....West 18 to 25 mph until 0200, then 28 to 30
mph.
Smoke dispersal.....Poor.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........80 85 90 95 90 95 95 85 85 80 75 65
Weather cov.....DEF DEF DEF DEF DEF DEF DEF DEF DEF LKY DEF DEF
Weather type....SW SW SW SW SW SW SW SW SW SW SW SW
Tstm cov........
CWR.............90 90 90 90 90 80 80 80 80 80 80 60
Chc of pcpn (%).80 90 90 90 90 90 90 80 80 70 80 90
Temp............26 26 27 27 29 29 30 30 31 32 31 30
RH..............72 74 75 78 76 79 78 77 77 77 76 72
20 FT wind dir..W W W W W W W W W W W W
20 FT wind spd..11 11 12 13 15 15 15 17 17 17 17 17
20 FT wind gust.21 22 23 25 26 26 26 29 30 30 30 34
Ridge wind dir..W W W W W W W W W W W W
Ridge wind spd..20 20 20 20 25 25 25 25 25 25 25 25
Mix hgt (kft)...1.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.5 1.0
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.18 18 20 21 23 23 24 25 28 28 30 29
SDspl kt-ft/100022 17 18 18 20 20 24 24 28 29 33 27
.SATURDAY...
Sky/weather.........Partly sunny (50-60 percent). Snow showers
through the morning and again in the afternoon.
CWR.................60 percent decreasing to 11 percent late in the
morning.
Chance of pcpn......90 percent.
Max temperature.....Around 32.
Min humidity........56 percent.
Wind (20 ft)........West winds 11 to 17 mph. Gusts up to 44 mph
decreasing to 33 mph late in the afternoon.
Ridgetop wind.......West 20 to 25 mph.
Mixing height.......2000 ft AGL until 0900, then increasing to 4500
ft AGL until 1600, then decreasing to 2500 ft AGL.
Transport winds.....West 28 to 37 mph until 1200, then 31 to 40 mph
until 1600, then 18 to 24 mph.
Smoke dispersal.....Poor until 0800, then increasing to good until
1000, then increasing to excellent until 1500,
then decreasing to poor after 1700.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........50 60 60 50 50 50 50 45 45 45 45 45
Weather cov.....DEF DEF DEF DEF DEF LKY LKY LKY LKY LKY LKY CHC
Weather type....SW SW SW SW SW SW SW SW SW SW SW SW
Tstm cov........
CWR.............60 60 60 60 60 10 10 10 10 10 10 10
Chc of pcpn (%).90 90 90 90 90 60 60 60 60 60 60 50
Temp............29 27 27 29 30 30 31 31 30 29 27 25
RH..............74 73 72 72 68 62 59 57 57 58 60 62
20 FT wind dir..W W W W W W W W W W W W
20 FT wind spd..17 17 17 17 17 17 17 17 17 15 13 11
20 FT wind gust.35 34 33 32 30 30 30 30 29 26 24 22
Ridge wind dir..W W W W W W W W W W W W
Ridge wind spd..25 25 25 25 25 25 25 25 25 25 20 20
Mix hgt (kft)...1.0 1.0 2.0 3.0 4.0 4.0 4.5 4.5 4.5 3.5 2.5 1.5
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.28 29 28 29 36 37 40 39 37 31 24 18
SDspl kt-ft/100025 28 48 81 123 133 157 151 141 93 53 25
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...
Partly cloudy. Chance of snow showers. Lows around 18. Highs in
the lower 30s. West winds around 11 mph.
.MONDAY...
Mostly cloudy. Snow showers likely. Lows in the lower 20s. Highs
in the mid 30s. West winds around 13 mph.
.TUESDAY...
Snow showers likely. Lows in the mid 20s. Highs in the lower 40s.
West winds around 19 mph.
$$
Forecaster...Gerhardt
Requested by...Grant Martin
Type of request...PRESCRIBED
.TAG 2526914.1/RIW
.DELDT 12/05/25
.FormatterVersion 2.0.0
.EMAIL Grant.martin@usda.gov