Suppression Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
893
FNUS75 KRIW 011752
FWSRIW
Spot Forecast for Cottonwood Creek Fire...Powder River Fire District
National Weather Service Riverton WY
1152 AM MDT Fri Aug 1 2025
Forecast is based on forecast start time of 1200 MDT on August 01.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Showers and thunderstorms are expected to develop in the area this
afternoon, with the best chance of storms at the fire between 1500
and 1900. Strong and variable wind gusts of 35 to 45 mph will be
possible with any shower or storm in the vicinity, as well as
briefly heavy rain if a cell passes directly over. Otherwise,
expect wind generally out of the west today. Showers and storms
will end by sunset, with decreasing clouds and a breezy west wind
overnight. Saturday will be similar, with showers and
thunderstorms most likely after 1600.
...Thunderstorms imply strong gusty and erratic winds...
.REST OF TODAY...
Sky/weather.........Mostly sunny (25-35 percent). Isolated showers
and thunderstorms developing in the area
through the afternoon.
CWR.................3 percent.
Chance of pcpn......30 percent.
Chance of thunder...29 percent.
Max temperature.....Around 78.
Min humidity........24 percent.
Wind (20 ft)........Generally west 6 to 10 mph with gusts to
15 mph until 1600. Then, wind is expected
to increase due to thunderstorms in the
area. Variable wind gusts of 35 to 45 mph
are possible during this time.
Ridgetop wind.......Southwest around 15 mph until 1700, then west
around 30 mph.
Mixing height.......Increasing to 12000 ft AGL by 1500.
Transport winds.....West 13 to 16 mph until 1700, then around 30
mph.
Smoke dispersal.....Fair increasing to excellent by 1400.
TIME (MDT) 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........20 25 35 30 25 40
Weather cov.....ISO ISO ISO ISO SCT SCT
Weather type....RW RW RW RW RW RW
Tstm cov........ISO ISO ISO ISO SCT SCT
CWR.............0 0 0 0 0 0
Chc of pcpn (%).20 20 20 20 30 30
Chc of thdr (%).20 20 20 20 30 30
Temp............74 75 76 76 76 74
RH..............36 32 29 27 26 28
20 FT wind dir..SW W W SW SW W
20 FT wind spd..6 9 9 8 15 20
20 FT wind gust.10 13 13 12 25 29
Ridge wind dir..SW W W SW SW W
Ridge wind spd..15 15 15 15 15 30
Mix hgt (kft)...4.0 8.0 12 12 12 11
Transp wind dir.SW W W W W W
Transp wind spd.13 16 16 16 15 30
SDspl kt-ft/100044 110 160 171 148 270
.TONIGHT...
Sky/weather.........Mostly cloudy (60-70 percent) then becoming
partly cloudy (25-35 percent). Isolated showers
and thunderstorms until 2100.
CWR.................0 percent.
Chance of pcpn......20 percent.
Chance of thunder...14 percent.
Min temperature.....Around 57.
Max humidity........58 percent.
Wind (20 ft)........Gusty and variable thunderstorm winds expected
through 2000. Then a northeast wind switching
to out of the west around 8 mph after 0100.
Ridgetop wind.......Northwest around 30 mph until 1900, then west
10 to 15 mph until 2200, then northeast until
0100, then west.
Mixing height.......4500 ft AGL decreasing to around 500 ft AGL
after 2000.
Transport winds.....Generally west around 15 mph.
Smoke dispersal.....Very good becoming poor by 2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........65 65 60 35 45 40 20 20 15 30 30 30
Weather cov.....ISO ISO ISO
Weather type....RW RW RW
Tstm cov........ISO ISO ISO
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).20 10 10 10 10 0 0 0 0 0 0 0
Chc of thdr (%).10 10 10 10 10 0 0 0 0 0 0 0
Temp............68 67 66 64 62 61 60 59 59 59 58 58
RH..............39 41 41 43 45 48 51 50 50 48 48 49
20 FT wind dir..NW W W NW NE NE N NW W W W W
20 FT wind spd..20 8 8 6 7 9 7 6 6 8 8 8
20 FT wind gust.29 12 12 7 10 13 10 10 10 12 12 12
Ridge wind dir..NW W W NW NE NE N NW W W W W
Ridge wind spd..30 15 15 10 15 15 15 15 15 15 15 15
Mix hgt (kft)...4.5 2.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.W NW W W N NE SW W W W W W
Transp wind spd.30 16 15 12 14 16 14 13 13 15 15 15
SDspl kt-ft/1000114 30 4 3 4 4 4 4 4 4 4 4
.SATURDAY...
Sky/weather.........Mostly sunny (25-35 percent). Isolated showers
and thunderstorms in the afternoon.
CWR.................0 percent.
Chance of pcpn......20 percent.
Chance of thunder...16 percent.
Max temperature.....Around 79.
Min humidity........21 percent.
Wind (20 ft)........Generally west around 10 mph with gusts to
around 15 mph. Gusty and erratic winds expected
near thunderstorms in the afternoon.
Ridgetop wind.......West 15 to 20 mph.
Mixing height.......500 ft AGL increasing to 12000 ft AGL by 1400.
Transport winds.....West 13 to 18 mph.
Smoke dispersal.....Poor increasing to excellent by 1300.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........25 10 5 5 5 5 5 25 30 35 30 50
Weather cov..... ISO ISO ISO ISO ISO ISO
Weather type.... RW RW RW RW RW RW
Tstm cov........ ISO ISO ISO ISO ISO ISO
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 20 20 20
Chc of thdr (%).0 0 0 0 0 0 10 10 10 20 20 20
Temp............58 59 63 68 71 73 75 76 77 78 77 74
RH..............48 47 43 37 33 28 25 24 23 22 23 29
20 FT wind dir..NW NW W W W W W W W NW NW NW
20 FT wind spd..9 8 8 11 11 10 9 8 8 7 6 7
20 FT wind gust.13 12 12 16 16 14 13 12 12 10 10 10
Ridge wind dir..NW NW W W W W W W W NW NW NW
Ridge wind spd..15 15 15 20 20 15 15 15 15 15 15 15
Mix hgt (kft)...0.5 0.5 0.5 1.5 4.0 7.0 9.0 11 12 11 12 7.5
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.16 15 15 18 18 17 16 16 15 14 13 15
SDspl kt-ft/10005 5 6 26 66 103 126 154 150 132 126 100
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...
Partly cloudy. Chance of showers and thunderstorms. Lows in the
lower 50s. Highs in the lower 70s. Northwest winds 5 to 10 mph.
.MONDAY...
Mostly clear. Lows in the mid 50s. Highs in the upper 70s.
Southeast winds around 6 to 10 mph.
.TUESDAY...
Mostly clear. Lows in the mid 50s. Highs in the upper 70s.
West winds 10 to 15 mph.
$$
Forecaster...Myers
Requested by...Anita Bartlett
Type of request...WILDFIRE
.TAG 2519006.0/RIW
.DELDT 08/01/25
.FormatterVersion 2.0.0
.EMAIL prfd@rtconnect.net