Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
532
FNUS75 KRIW 270152
FWSRIW
Spot Forecast for Muddy...USFS
National Weather Service Riverton WY
752 PM MDT Wed Aug 26 2026
Forecast is based on forecast start time of 2000 MDT on August 26.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
A few isolated showers and thunderstorms (10-20%) cannot be ruled
out through the remainder of the evening. Otherwise winds should
gradually shift more northerly late this evening at 10 to 15 mph.
Lighter winds of 5 to 10 mph from the north are expected through
the overnight. Relative humidity should improve overnight with
values getting into the 50 to 60 percent range. Temperatures will
cool down into the upper 40s to low 50s overnight.
Winds increase from the west by the late morning hours (10/11 AM)
around 10 to 15 mph with periodic gusts of 20 to 25 mph at times.
High temperatures will get into the 70s Thursday with min
relative humidity values around 25%. Showers and thunderstorms
will once again be possible by the afternoon. Storms could produce
strong outflow winds in excess of 30 to 40 mph with frequent
lightning and brief periods of heavy rain possible.
...Thunderstorms imply strong gusty and erratic winds...
.REST OF TONIGHT...
Sky/weather.........Partly cloudy (35-45 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...13 percent.
Min temperature.....Around 48.
Max humidity........61 percent.
Wind (20 ft)........Light winds. Gusty and erratic winds expected
near thunderstorms early in the evening.
Ridgetop wind.......West around 10 mph until 2100, then north.
Mixing height.......500 ft AGL.
Transport winds.....North 10 to 13 mph.
Smoke dispersal.....Poor.
TIME (MDT) 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........40 65 50 40 40 35 40 35 20 20
Weather cov.....SCH
Weather type....RW
Tstm cov........SCH
CWR.............0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).10 10 10 0 0 0 0 0 0 0
Chc of thdr (%).10 0 0 0 0 0 0 0 0 0
Temp............60 58 56 54 55 54 53 53 52 52
RH..............46 51 53 57 51 50 50 50 52 59
20 FT wind dir..W N N N N N N N N N
20 FT wind spd..6 6 6 6 5 6 6 6 6 6
20 FT wind gust.7 7 7 7 6 7 8 7 7 7
Ridge wind dir..W N N N N N N N N N
Ridge wind spd..10 10 10 10 10 10 15 10 10 10
Mix hgt (kft)...0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.N NE N N N N N N N N
Transp wind spd.12 12 12 12 10 12 13 12 12 12
SDspl kt-ft/10006 6 6 6 5 6 6 6 6 6
.THURSDAY...
Sky/weather.........Mostly sunny (25-35 percent) then becoming
mostly cloudy (65-75 percent). Slight chance of
rain showers and thunderstorms late in the afternoon.
CWR.................0 percent.
Chance of pcpn......30 percent.
Chance of thunder...21 percent.
Max temperature.....Around 74.
Min humidity........24 percent.
Wind (20 ft)........Light winds until 1100, then west 7 to 10 mph.
Gusty and erratic winds expected near
thunderstorms late in the afternoon.
Ridgetop wind.......North around 10 mph until 1000, then west.
Mixing height.......1500 ft AGL until 1000, then 3000 ft AGL until
1100, then 7000 ft AGL until 1300, then 10000
ft AGL until 1700, then 6000 ft AGL.
Transport winds.....North 9 to 12 mph until 0900, then west 8 to 16
mph until 1600, then northwest 17 to 18 mph.
Smoke dispersal.....Poor until 1000. Good early in the morning
increasing to very good in the afternoon after
1400.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........20 25 35 5 10 15 15 15 20 30 50 70
Weather cov..... SCH SCH CHC
Weather type.... RW RW RW
Tstm cov........ SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 10 10 10 10 20 30
Chc of thdr (%).0 0 0 0 0 0 10 10 10 10 20 20
Temp............51 51 54 59 65 67 69 71 72 73 72 71
RH..............59 59 51 43 35 33 31 29 25 24 24 26
20 FT wind dir..N N N NW W W W W W W W SW
20 FT wind spd..6 6 4 3 6 7 7 7 8 9 9 10
20 FT wind gust.7 7 6 5 7 10 10 10 12 13 13 14
Ridge wind dir..N N N NW W W W W W W W SW
Ridge wind spd..10 10 10 10 10 15 15 15 15 15 15 15
Mix hgt (kft)...0.5 0.5 0.5 1.5 3.0 5.5 7.0 8.5 9.0 10 8.5 6.0
Transp wind dir.N N N W W W W W W W W NW
Transp wind spd.12 12 9 8 12 14 14 14 15 16 18 17
SDspl kt-ft/10005 6 4 11 32 64 85 101 118 137 135 93
.THURSDAY NIGHT...
Sky/weather.........Mostly cloudy (60-70 percent) then becoming
partly cloudy (45-55 percent). Chance of rain
showers early in the evening. Slight chance of
thunderstorms early in the evening. Slight
chance of rain showers in the evening.
CWR.................0 percent.
Chance of pcpn......30 percent.
Chance of thunder...12 percent.
Min temperature.....Around 51.
Max humidity........60 percent.
Wind (20 ft)........West winds around 10 mph until 1900, then north
7 to 10 mph until 2200, then light. Gusty and
erratic winds expected near thunderstorms early
in the evening.
Ridgetop wind.......West around 15 mph until 1900, then north.
Mixing height.......3500 ft AGL until 2000, then 500 ft AGL.
Transport winds.....West around 17 mph until 1900, then south until
2000, then northwest until 2300, then southwest
9 to 10 mph until 0100, then northwest around 8
mph.
Smoke dispersal.....Good until 1900. Poor after 2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........70 70 55 50 60 50 25 30 35 50 40 45
Weather cov.....CHC SCH SCH SCH SCH SCH
Weather type....RW RW RW RW RW RW
Tstm cov........SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).30 20 20 20 20 20 0 0 0 0 10 10
Chc of thdr (%).10 10 10 10 10 10 0 0 0 0 0 0
Temp............69 66 61 59 57 55 55 56 56 55 54 53
RH..............29 34 42 48 48 50 49 49 51 54 55 57
20 FT wind dir..W N N N N N N NE NE N N NE
20 FT wind spd..10 10 8 7 6 5 4 3 3 3 3 3
20 FT wind gust.14 14 12 10 7 6 6 5 5 5 6 6
Ridge wind dir..W N N N N N N NE NE N N NE
Ridge wind spd..15 15 15 15 10 10 10 10 10 10 10 10
Mix hgt (kft)...4.5 3.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.W S NW NW N W SW NW NW W W N
Transp wind spd.17 17 15 14 12 10 9 8 8 8 8 8
SDspl kt-ft/100071 50 12 7 6 5 4 4 4 4 4 3
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...
Mostly cloudy. Showers and chance of thunderstorms. Lows in the
upper 40s. Highs in the lower 60s. West winds around 11 mph.
.SUNDAY...
Showers likely and chance of thunderstorms. Lows in the lower
40s. Highs around 60. West winds around 10 mph.
.MONDAY...
Mostly clear. Slight chance of showers and thunderstorms. Lows in
the upper 30s. Highs in the lower 60s. West winds around 8 mph.
$$
Forecaster...Dziewaltowski
Requested by...Teton Dispatch Center
Type of request...WILDFIRE
.TAG 2620654.0/RIW
.DELDT 08/26/26
.FormatterVersion 2.0.0
.EMAIL wytdc@firenet.gov