Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
025
FNUS75 KRIW 261155
FWSRIW
Spot Forecast for Upper Clarks Fork RX...USFS SHF
National Weather Service Riverton WY
555 AM MDT Sat Apr 26 2025
Forecast is based on ignition time of 0600 MDT on April 26.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Dry conditions and high clouds will be in place today. There is
only a 10% chance for a shower or thunderstorm through the
afternoon. Winds will turn more southwesterly by 1200, with gusts
of 15 to 20 mph occurring between 1400 and 1800. Conditions will
remain dry tonight, with skies becoming more partly cloudy before
sunrise Sunday morning. Chances for showers and thunderstorms will
increase Sunday afternoon, as a storm system approaches Wyoming.
The timing for the precipitation will increase after 1400,
becoming likely (60%) after 1600. Chances are looking good
(80-90%) for steady precipitation after 2000 Sunday night.
...Thunderstorms imply strong gusty and erratic winds...
.TODAY...
Sky/weather.........Partly sunny (50-60 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...9 percent.
Max temperature.....Around 57.
Min humidity........29 percent.
Wind (20 ft)........Light winds until 1200, then southwest 8 to 10
mph with gusts to around 16 mph.
Ridgetop wind.......Light winds until 0700, then northwest around
10 mph until 1000, then southwest 10 to 15 mph.
Mixing height.......3000 ft AGL until 1100, then 7000 ft AGL until
1300, then 8500 ft AGL until 1700, then 5500 ft
AGL.
Transport winds.....Southwest 7 to 12 mph until 1100, then 17 to 23
mph.
Smoke dispersal.....Poor until 1100, then good until 1200, then
increasing to excellent in the afternoon until
1700, then good.
TIME (MDT) 6 AM 9 AM NOON 3 PM
Sky (%).........65 60 45 50
Weather cov.....
Weather type....NONE NONE NONE NONE
Tstm cov........
CWR.............0 0 0 0
Chc of pcpn (%).0 10 10 10
Chc of thdr (%).0 0 10 10
Temp............31 40 52 56
RH..............78 71 38 30
20 FT wind......NW 2 W 2 SW 8G13 SW 10G16
Ridgetop wind...NW 5 W 5 SW 15 SW 15
Mix hgt (ft)....1500 2000 7000 8000
Transport wind..SW 7 SW 7 SW 21 SW 22
SDspl kt-ft/100011 11 129 154
.TONIGHT...
Sky/weather.........Partly cloudy (40-50 percent) then becoming
mostly cloudy (50-60 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...7 percent.
Min temperature.....Around 34.
Max humidity........69 percent.
Wind (20 ft)........Southwest winds around 8 mph with gusts to
around 13 mph until 1900, then light.
Ridgetop wind.......West 10 to 15 mph until 0500, then light.
Mixing height.......4500 ft AGL until 1900, then 1500 ft AGL.
Transport winds.....West 8 to 15 mph until 0200, then around 8 mph
until 0400, then north 7 to 8 mph.
Smoke dispersal.....Good until 1900. Poor after 2100.
TIME (MDT) 6 PM 9 PM MIDNGT 3 AM
Sky (%).........50 40 40 50
Weather cov.....
Weather type....NONE NONE NONE NONE
Tstm cov........
CWR.............0 0 0 0
Chc of pcpn (%).10 10 0 10
Chc of thdr (%).10 0 0 0
Temp............55 42 38 35
RH..............35 61 69 67
20 FT wind......SW 8G13 W 4G6 W 3 W 3
Ridgetop wind...SW 15 W 10 W 10 W 10
Mix hgt (ft)....4500 1500 1500 1500
Transport wind..SW 15 W 9 W 8 W 8
SDspl kt-ft/100062 14 12 12
.SUNDAY...
Sky/weather.........Partly sunny (65-75 percent). Rain showers
likely and slight chance of thunderstorms
after 1200.
CWR.................0 percent increasing to 37 percent in the
afternoon.
Chance of pcpn......60 percent.
Chance of thunder...15 percent.
Max temperature.....Around 57.
Min humidity........32 percent.
Wind (20 ft)........Light winds. Gusty and erratic winds expected
near thunderstorms in the afternoon.
Ridgetop wind.......Light winds until 1000, then east around 10
mph.
Mixing height.......2500 ft AGL until 1000, then 4500 ft AGL until
1200, then 6500 ft AGL until 1700, then 4500 ft
AGL.
Transport winds.....Northeast around 7 mph until 0900, then
southeast 7 to 16 mph.
Smoke dispersal.....Poor until 1100, then fair until 1300, then
good until 1700, then fair.
TIME (MDT) 6 AM 9 AM NOON 3 PM
Sky (%).........55 55 80 80
Weather cov..... LIKELY LIKELY
Weather type....NONE NONE RNSHWR RNSHWR
Tstm cov........ S CHC S CHC
CWR.............0 0 40 40
Chc of pcpn (%).10 10 60 60
Chc of thdr (%).0 0 20 20
Temp............34 46 56 56
RH..............67 56 33 34
20 FT wind......NW 2 E 2 E 4G6 E 6G8
Ridgetop wind...NW 5 E 5 E 10 E 10
Mix hgt (ft)....1500 2500 5500 6500
Transport wind..NE 7 E 7 SE 12 E 16
SDspl kt-ft/100011 15 54 91
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...
Cooler. Showers, snow showers and slight chance of thunderstorms.
Lows in the lower 30s. Highs in the mid 40s. North to northwest
winds 10-15 mph.
.TUESDAY...
Mostly cloudy. Lows in the upper 20s. Highs around 50. West to
southwest winds 10-15 mph with gusts up to 20 mph.
.WEDNESDAY...
Showers, snow showers likely and slight chance of thunderstorms.
Lows in the lower 30s. Highs in the upper 40s. West to northwest
winds 10-15 mph.
$$
Forecaster...LaVoie
Requested by...Peter Freire
Type of request...PRESCRIBED
.TAG 2511679.2/RIW
.DELDT 04/26/25
.FormatterVersion 2.0.0
.EMAIL peter.freire@usda.gov