Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
886
FNUS75 KRIW 210955
FWSRIW
Spot Forecast for Corpe Creek...USWFS
National Weather Service Riverton WY
355 AM MDT Fri Aug 21 2026
Forecast is based on forecast start time of 0700 MDT on August 21.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
...Thunderstorms imply strong gusty and erratic winds...
Today will be a warm and mainly dry day. Increasing moisture may
bring a stray shower before sunrise, or a stray shower or thunderstorm.
between 1200 and 2000 this afternoon and evening. The chance is very
small though, less than 15 percent. Any shower or thunderstorm would
have only light rain, and could contain wind gusts greater than 40
mph. Humidity will fall to around 20 to 25 percent this afternoon.
Moisture will deepen across the area on Saturday and bring higher
humidity along with a better chance of a shower or thunderstorm,
especially after 1700 through 2200 Saturday afternoon and evening.
The greatest chance of a wetting rain will be Saturday evening.
.REST OF TODAY...
Sky/weather.........Partly sunny (35-45 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...10 percent.
Max temperature.....Around 80.
Min humidity........23 percent.
Wind (20 ft)........West winds around 8 mph until 0800, then north
8 to 10 mph with gusts to around 16 mph.
Ridgetop wind.......West 10 to 15 mph until 1100, then north.
Mixing height.......1500 ft AGL until 1000, rising to 9000 ft AGL
after 1200.
Transport winds.....Northwest 12 to 17 mph until 1500, then north.
Smoke dispersal.....Poor until 0900, becoming very good by 1100.
TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........65 60 60 45 30 30 30 35 35 40 40
Weather cov.....
Weather type....
Tstm cov........
CWR.............10 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 10 10 10 10 10 10
Chc of thdr (%).0 0 0 0 0 10 10 10 10 10 10
Temp............62 67 71 73 75 77 77 77 78 77 76
RH..............35 32 28 26 24 24 23 23 24 24 25
20 FT wind dir..W W W W N N N N N N N
20 FT wind spd..8 6 6 5 6 6 8 9 10 10 10
20 FT wind gust.12 10 7 6 7 10 13 14 16 16 16
Ridge wind dir..W W W W N N N N N N N
Ridge wind spd..15 15 10 10 10 15 15 15 15 15 15
Mix hgt (kft)...0.5 0.5 1.5 5.0 7.5 9.0 9.0 9.0 9.5 8.0 7.0
Transp wind dir.W W W W NW NW NW NW NW N N
Transp wind spd.15 13 12 14 16 16 17 16 17 17 17
SDspl kt-ft/10007 5 16 59 108 127 133 130 139 123 108
.TONIGHT...
Sky/weather.........Partly cloudy (45-55 percent) then becoming
mostly cloudy (65-75 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...10 percent.
Min temperature.....Around 59.
Max humidity........46 percent.
Wind (20 ft)........North winds 8 to 10 mph with gusts to around 16
mph until 2300, then light.
Ridgetop wind.......North 10 to 15 mph until 0200, then west.
Mixing height.......5500 ft AGL until 1900. 500 ft AGL after 2000.
Transport winds.....North 10 to 17 mph until 0300, then west 9 to
10 mph.
Smoke dispersal.....Good until 1900. Poor after 2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........40 55 50 60 85 65 70 60 55 70 60 70
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).10 10 0 0 0 0 0 0 0 0 0 0
Chc of thdr (%).10 10 0 0 0 0 0 0 0 0 0 0
Temp............74 71 67 66 64 63 62 61 61 60 59 61
RH..............27 32 36 37 38 40 42 43 45 47 46 45
20 FT wind dir..N N N N N N N NW W W W W
20 FT wind spd..10 9 9 9 8 6 5 5 5 4 5 5
20 FT wind gust.16 14 13 13 12 10 6 6 6 6 6 6
Ridge wind dir..N N N N N N N NW W W W W
Ridge wind spd..15 15 15 15 15 15 10 10 10 10 10 10
Mix hgt (kft)...5.5 3.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.N N N N N N N N NW W W W
Transp wind spd.17 16 16 16 15 13 10 10 10 9 10 10
SDspl kt-ft/100084 44 9 8 7 6 4 5 4 4 5 5
.SATURDAY...
Sky/weather.........Mostly cloudy (75-85 percent) then becoming
partly sunny (45-55 percent). Slight chance of
showers and thunderstorms after 1500.
CWR.................0 percent.
Chance of pcpn......30 percent.
Chance of thunder...16 percent.
Max temperature.....Around 76.
Min humidity........37 percent.
Wind (20 ft)........Light winds until 1200, then southeast 7 to 8
mph with gusts to around 14 mph. Gusty and
erratic winds expected near thunderstorms late
in the afternoon.
Ridgetop wind.......Southwest around 10 mph until 0900, then
southeast.
Mixing height.......1500 ft AGL until 1000. 7500 ft AGL after 1400.
Transport winds.....Southwest 8 to 16 mph until 1500, then 14 to 18
mph.
Smoke dispersal.....Poor until 1000, becoming good after 1100.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........55 90 85 90 85 85 70 65 50 50 50 45
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 0 10 10 20 20 30
Chc of thdr (%).0 0 0 0 0 0 0 0 10 20 20 20
Temp............61 61 65 67 68 70 72 73 74 75 74 74
RH..............44 43 41 41 41 40 40 40 38 37 38 38
20 FT wind dir..SW SW W SE SE SE S S SE S SE SE
20 FT wind spd..3 3 3 4 5 6 7 7 7 8 7 7
20 FT wind gust.6 6 6 7 10 10 13 13 14 14 14 14
Ridge wind dir..SW SW W SE SE SE S S SE S SE SE
Ridge wind spd..10 10 10 10 10 10 15 15 15 15 15 15
Mix hgt (kft)...0.5 0.5 0.5 1.5 2.5 5.0 6.0 6.5 7.0 7.5 7.0 6.5
Transp wind dir.SW W W S S SW SW W SW W SW SW
Transp wind spd.8 8 9 9 10 13 15 15 16 18 17 14
SDspl kt-ft/10004 3 4 11 24 53 78 83 99 124 105 80
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...
Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows around 60. Highs in the upper 70s. Light
winds.
.MONDAY...
Partly cloudy. Slight chance of showers and thunderstorms. Lows
in the upper 50s. Highs in the lower 70s. West winds around
7 mph.
.TUESDAY...
Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the mid 50s. Highs in the upper 60s. Light
winds.
$$
Forecaster...Hattings
Requested by...James Corbett
Type of request...WILDFIRE
.TAG 2620115.0/RIW
.DELDT 08/21/26
.FormatterVersion 2.0.0
.EMAIL james_corbett@fws.gov