Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
494
FNUS75 KRIW 251141
FWSRIW
Spot Forecast for Cottonwood Fire...USFS
National Weather Service Riverton WY
541 AM MDT Fri Sep 25 2026
Forecast is based on forecast start time of 0700 MDT on September 25.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Dry conditions and mostly sunny skies throughout the day Friday.
Light southerly winds less than 10 mph in the morning, becoming
out of the southwest 10 to 15 mph after 1200. As such, poor smoke
dispersal and mixing in the morning, becoming very good in the
afternoon. Above average temperatures in the afternoon similar to
Thursday with humidity values down to around 25 percent and good
recovery overnight. A bit stronger wind and continued dry
conditions Saturday with the next chance for precipitation coming
Sunday.
...Thunderstorms imply strong gusty and erratic winds...
.REST OF TODAY...
Sky/weather.........Mostly sunny (25-35 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 68.
Min humidity........24 percent.
Wind (20 ft)........Light winds until 1200, then southwest 10-15 mph.
Ridgetop wind.......Southeast 10 to 15 mph until 1200, then
southwest 15 to 20 mph.
Mixing height.......2000 ft AGL until 1100. 9000 ft AGL after 1400.
Transport winds.....South 10 to 15 mph until 1200, then southwest
15 to 20 mph.
Smoke dispersal.....Poor until 1200, then very good.
TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........50 45 25 15 5 5 5 10 15 10 10
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0
Temp............45 45 48 53 59 63 66 67 68 67 66
RH..............58 60 56 44 39 31 26 25 24 25 26
20 FT wind dir..SE SE S S S SW SW W W W W
20 FT wind spd..6 6 6 6 6 8 9 10 10 11 11
20 FT wind gust.10 7 7 7 10 12 13 14 14 16 16
Ridge wind dir..SE SE S S S SW SW W W W W
Ridge wind spd..15 10 10 10 15 15 15 15 15 20 20
Mix hgt (kft)...0.5 0.5 1.0 2.0 4.0 6.0 7.5 8.5 9.0 9.0 8.5
Transp wind dir.SE S S S SW SW W W W W W
Transp wind spd.13 12 12 12 13 15 16 17 18 20 20
SDspl kt-ft/10006 6 9 22 44 81 107 129 145 151 142
.TONIGHT...
Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 44.
Max humidity........55 percent.
Wind (20 ft)........Southwest winds 10-15 mph until 2000, then south.
Ridgetop wind.......Southwest 15 to 20 mph until 2000, then south
around 10 mph until.
Mixing height.......6500 ft AGL until 1900, then 500 ft AGL.
Transport winds.....Southwest 15 to 20 mph until 2000, then south
10 to 15 mph until 0200, then southwest 10 mph.
Smoke dispersal.....Very good until 2000, then fair.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........10 10 20 20 25 30 30 30 20 30 30 25
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0
Temp............61 57 54 52 51 50 49 49 48 47 46 45
RH..............31 38 38 41 42 42 43 46 46 49 51 53
20 FT wind dir..W SW S S S S S SE SE E NE NE
20 FT wind spd..11 9 10 11 11 10 9 5 3 4 2 2
20 FT wind gust.16 13 14 16 16 14 13 6 4 6
Ridge wind dir..W SW S S S S S SE SE E NE NE
Ridge wind spd..20 15 15 20 20 15 15 10 10 10 5 5
Mix hgt (kft)...6.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.W SW SW S S S SW SW SW SW NW N
Transp wind spd.18 16 17 18 18 17 16 10 8 9 7 7
SDspl kt-ft/1000102 17 8 9 9 8 8 5 4 5 3 3
.SATURDAY...
Sky/weather.........Sunny (20-30 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 62.
Min humidity........33 percent.
Wind (20 ft)........Light winds until 1200, then southwest 10 to 15
mph.
Ridgetop wind.......North around 10 mph until 1200, then southwest
10 to 15 mph until mph.
Mixing height.......2000 ft AGL until 1100. 8000 ft AGL after 1400.
Transport winds.....Northwest 10 mph until 1200, then southwest 15 to
20 mph.
Smoke dispersal.....Poor until 1200, then very good.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........25 25 20 10 10 15 15 15 20 35 40 30
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0
Temp............44 44 45 48 51 54 57 59 61 61 62 60
RH..............55 55 52 49 46 43 38 37 33 33 33 34
20 FT wind dir..N SE SE S SW SW SW SW SW SW SW SW
20 FT wind spd..4 2 2 5 4 5 8 9 10 11 10 10
20 FT wind gust.6 6 6 6 12 13 14 16 14 14
Ridge wind dir..N SE SE S SW SW SW SW SW SW SW SW
Ridge wind spd..10 5 5 10 10 10 15 15 15 20 15 15
Mix hgt (kft)...0.5 0.5 0.5 1.0 2.0 4.0 6.0 7.0 8.0 8.0 7.5 7.0
Transp wind dir.NW NW E SW SW SW SW SW SW SW SW SW
Transp wind spd.9 7 7 10 9 15 22 23 24 24 24 23
SDspl kt-ft/10004 3 3 8 16 52 111 140 167 170 161 141
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...
Mostly cloudy. Lows in the upper 40s. Highs in the lower 60s.
South winds around 9 mph.
.MONDAY...
Showers and chance of thunderstorms. Lows in the mid 40s. Highs
in the mid 50s. Light winds.
.TUESDAY...
Partly cloudy. Slight chance of showers and thunderstorms. Lows
in the upper 30s. Highs in the mid 50s. Light winds.
$$
Forecaster...Lowe
Requested by...Cottonwood IC
Type of request...WILDFIRE
.TAG 2622488.1/RIW
.DELDT 09/25/26
.FormatterVersion 2.0.0
.EMAIL wytdc@firenet.gov