Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
469
FNUS75 KRIW 011440
FWSRIW
Spot Forecast for CFO Programmatic Slash Pile RX...BLM
National Weather Service Riverton WY
740 AM MST Mon Dec 1 2025
Forecast is based on ignition time of 1000 MST on December 01.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Dry conditions and mostly clear skies today with seasonable
temperatures. Winds will be from the west/southwest throughout the
day at around 15 to 20 mph with periodic gusts of 25 to 30 mph.
Winds are expected to continue to increase by the late evening
Monday into the early morning hours on Tuesday. Min RH will be
well above criteria with values in the upper 40s to low 50s. A
nearing disturbance will bring chances for showers starting as
early as Tuesday morning. Precipitation chances look to increase
through the day Tuesday with a few inches of snow possible across
the area by Wednesday morning.
...Thunderstorms imply strong gusty and erratic winds...
.REST OF TODAY...
Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Max temperature.....Around 22.
Min humidity........50 percent.
Wind (20 ft)........Southwest winds 12 to 17 mph. Gusts up to 30
mph increasing to 31 mph late in the afternoon.
Ridgetop wind.......Southwest 20 to 25 mph.
Mixing height.......1000 ft AGL after 1200 until 1600.
Transport winds.....West 20 to 25 mph.
Smoke dispersal.....Poor.
TIME (MST) 3AM 4AM 5AM 6AM 7AM 8AM 9AM 10A
Sky (%).........10 10 10 10 5 10 20 25
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 0 0
Temp............17 19 20 21 22 21 20 19
RH..............55 52 50 50 51 55 61 65
20 FT wind dir..W W W W W SW SW SW
20 FT wind spd..12 12 14 15 16 17 17 16
20 FT wind gust.17 18 19 21 23 24 24 25
Ridge wind dir..W W W W W SW SW SW
Ridge wind spd..20 20 20 25 25 25 25 25
Mix hgt (kft)...0.1 0.1 0.5 1.0 1.0 0.5 0.1 0.1
Transp wind dir.W W W W SW SW SW SW
Transp wind spd.20 20 22 23 25 25 25 24
SDspl kt-ft/10000 0 7 16 17 15 0 0
.TONIGHT...
Sky/weather.........Partly cloudy (35-45 percent) Chance of snow
showers overnight.
CWR.................4 percent.
Chance of pcpn......30 percent.
Min temperature.....Around 17.
Max humidity........83 percent.
Wind (20 ft)........Breezy. Southwest winds 16 to 25 mph with gusts
to around 38 mph until 0500, then west around
26 mph with gusts to around 39 mph.
Ridgetop wind.......Southwest 25 to 30 mph until 0400, then around
35 mph.
Mixing height.......
Transport winds.....Southwest 24 to 32 mph until 0400, then 36 to
37 mph.
Smoke dispersal.....Poor.
TIME (MST) 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM 10P
Sky (%).........30 40 45 50 50 55 60 65 65 60 50 40
Weather cov..... CHC CHC CHC CHC CHC
Weather type.... SW SW SW SW SW
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 10 30 30 30 30 30
Temp............19 19 20 19 19 19 19 19 19 19 19 20
RH..............64 63 62 63 66 70 72 74 76 76 77 77
20 FT wind dir..SW SW SW SW SW SW SW SW SW SW SW W
20 FT wind spd..16 16 16 17 18 19 19 19 20 22 25 26
20 FT wind gust.24 24 24 25 26 28 29 30 31 34 38 39
Ridge wind dir..SW SW SW SW SW SW SW SW SW SW SW W
Ridge wind spd..25 25 25 25 30 30 30 30 30 30 35 35
Mix hgt (kft)...0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
Transp wind dir.SW SW SW SW SW SW SW SW SW SW SW SW
Transp wind spd.24 24 24 26 28 29 29 29 30 32 36 37
SDspl kt-ft/10000 0 0 0 0 0 0 0 0 0 0 0
.TUESDAY...
Sky/weather.........Partly sunny (60-70 percent). Chance of snow
showers, then snow showers late in the
afternoon.
CWR.................0 percent increasing to 66 percent late in the
afternoon.
Chance of pcpn......80 percent.
Max temperature.....Around 24.
Min humidity........79 percent.
Wind (20 ft)........Breezy. Southwest winds 17 to 25 mph with gusts
to around 38 mph until 1300, then 9 to 15 mph
with gusts to around 26 mph.
Ridgetop wind.......Southwest 30 to 35 mph until 1100. West around
15 mph after 1600.
Mixing height.......500 ft AGL after 1100 until 1600.
Transport winds.....Southwest 28 to 36 mph until 1300, then 17 to
26 mph.
Smoke dispersal.....Poor.
TIME (MST) 11P MID 1AM 2AM 3AM 4AM 5AM 6AM 7AM 8AM 9AM 10A
Sky (%).........50 55 65 65 65 65 65 70 70 75 75 75
Weather cov.....CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC DEF
Weather type....SW SW SW SW SW SW SW SW SW SW SW SW
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 70
Chc of pcpn (%).30 30 30 30 30 40 40 40 40 40 40 80
Temp............18 18 20 20 21 22 23 24 24 23 22 22
RH..............76 80 76 76 76 77 78 78 80 83 86 89
20 FT wind dir..SW SW SW SW SW SW SW SW SW SW W W
20 FT wind spd..25 23 20 19 18 17 17 15 14 12 10 9
20 FT wind gust.38 35 31 30 30 29 28 26 26 24 21 18
Ridge wind dir..SW SW SW SW SW SW SW SW SW SW W W
Ridge wind spd..35 35 30 30 30 25 25 25 20 20 15 15
Mix hgt (kft)...0.1 0.1 0.1 0.1 0.1 0.5 0.5 0.5 0.5 0.5 0.1 0.1
Transp wind dir.SW SW SW SW W W W SW SW SW SW SW
Transp wind spd.36 33 30 31 30 28 28 26 26 23 21 17
SDspl kt-ft/10000 0 0 0 4 7 8 8 10 6 3 0
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...
Mostly cloudy with snow showers. Lows around 14. Highs around 16.
Northwest winds around 7 mph.
.THURSDAY...
Mostly clear. Lows around 9. Highs around 19. Southwest winds
around 11 mph.
.FRIDAY...
Partly cloudy. Slight chance of snow showers. Lows around 15.
Highs in the mid 20s. Southwest winds around 13 mph.
$$
Forecaster...Dziewaltowski
Requested by...Jon Bisiar
Type of request...PRESCRIBED
.TAG 2526729.0/RIW
.DELDT 12/01/25
.FormatterVersion 2.0.0
.EMAIL rmorgan@blm.gov,jbisiar@blm.gov