Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
209
FNUS75 KRIW 182044
FWSRIW
Spot Forecast for Bare...USFS
National Weather Service Riverton WY
244 PM MDT Tue Aug 18 2026
Forecast is based on forecast start time of 0600 MDT on August 19.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Warm and dry conditions are expected to return to the area for
Wednesday. Little to no chances for precipitation are forecast for
the next day or two. Winds will be light from the north through much
of the morning Wednesday. However, speeds are expected to gradually
increase shortly after 1000 MDT. Winds will become more
northwesterly with speeds of 10 to 20 mph and gusts of 25 to 30
mph at times. Higher ridgetops may see stronger winds of 15 to 25
mph with gusts of 30 to 35 mph. Winds weaken around sunset (2000
MDT) becoming more westerly with speeds of 5 to 10 mph through
much of the overnight into Thursday.
...Thunderstorms imply strong gusty and erratic winds...
.WEDNESDAY...
Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 72.
Min humidity........24 percent.
Wind (20 ft)........West 3 to 5 mph until 1100, then west 8 to 12 mph
with gusts to around 17 mph.
Ridgetop wind.......West 10 to 15 mph until 1300, then around 20
mph.
Mixing height.......Increasing to 8000 ft AGL by 1400.
Transport winds.....West 9 to 17 mph until 1200, then 20 to 21 mph.
Smoke dispersal.....Poor increasing to very good by 1400.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........15 20 15 5 10 5 10 5 10 25 30 20
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............51 50 52 57 62 66 68 70 71 72 72 72
RH..............56 57 55 49 43 35 29 27 26 24 23 23
20 FT wind dir..W W W NW NW W W W W W W W
20 FT wind spd..5 5 4 3 5 8 10 11 11 12 12 12
20 FT wind gust.6 6 6 4 6 12 14 16 16 17 17 17
Ridge wind dir..W W W NW NW W W W W W W W
Ridge wind spd..10 10 10 10 10 15 15 20 20 20 20 20
Mix hgt (kft)...0.5 0.5 0.5 2.0 4.5 6.0 7.0 7.5 8.0 8.0 7.5 7.5
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.10 10 9 10 15 17 20 21 21 21 21 20
SDspl kt-ft/10005 5 5 19 58 88 116 137 145 148 139 126
.WEDNESDAY NIGHT...
Sky/weather.........Mostly clear (20-30 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 51.
Max humidity........41 percent.
Wind (20 ft)........Northwest winds 7 to 11 mph with gusts to
around 16 mph until 2100, west 3 to 5 mph.
Ridgetop wind.......Northwest 15 to 20 mph until 2200. Then west
5 to 10 mph.
Mixing height.......Decreasing to 500 ft AGL after 2000.
Transport winds.....West 9 to 18 mph until 0200, then 8 to 9 mph.
Smoke dispersal.....Becoming poor after 2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........30 25 30 30 35 25 10 10 10 10 15 10
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............71 69 65 59 57 56 55 54 54 54 53 53
RH..............24 28 33 37 40 40 41 41 40 40 40 40
20 FT wind dir..NW NW NW W W W W W W W W W
20 FT wind spd..11 9 7 6 6 5 5 4 3 3 2 2
20 FT wind gust.16 13 10 10 7 6 8 6 6 5 5 5
Ridge wind dir..NW NW NW W W W W W W W W W
Ridge wind spd..20 15 15 15 10 10 10 10 10 10 5 5
Mix hgt (kft)...6.5 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.W W NW NW NW NW W W W W W SW
Transp wind spd.18 16 14 13 12 10 10 9 8 8 9 9
SDspl kt-ft/1000103 42 7 6 6 5 5 5 4 4 5 5
.THURSDAY...
Sky/weather.........Mostly sunny (25-35 percent). Low chance of
a shower or thunderstorm in the afternoon.
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...13 percent.
Max temperature.....Around 76.
Min humidity........29 percent.
Wind (20 ft)........Southwest around 3 mph until 1100, then west
to southwest 3 to 8 mph with gusts to 15 mph.
Gusty and erratic winds expected near any
thunderstorms in the afternoon.
Ridgetop wind.......Light winds until 1000, then west 10 to 15 mph.
Mixing height.......Increasing to 8000 ft AGL by 1200.
Transport winds.....West 7 to 16 mph.
Smoke dispersal.....Increasing to very good after 1200.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........25 25 20 15 15 15 20 25 30 35 40 45
Weather cov..... SCH SCH SCH SCH SCH SCH
Weather type.... RW RW RW RW RW RW
Tstm cov........ SCH SCH SCH 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 10 10
Chc of thdr (%).0 0 0 0 0 0 10 10 10 10 10 10
Temp............53 52 55 60 65 69 73 75 76 76 76 75
RH..............40 42 41 38 35 32 29 28 28 29 29 30
20 FT wind dir..W W SW SW SW SW SW W W W W W
20 FT wind spd..2 2 2 2 3 5 6 7 7 7 7 6
20 FT wind gust.5 5 5 5 7 10 13 14 15 14 14 13
Ridge wind dir..W W SW SW SW SW SW W W W W W
Ridge wind spd..5 5 5 5 10 10 15 15 15 15 15 15
Mix hgt (kft)...0.5 0.5 1.0 1.0 3.5 6.0 8.0 8.0 8.0 8.0 7.0 6.0
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.8 9 8 7 9 13 16 15 15 14 14 13
SDspl kt-ft/10004 5 5 6 27 64 115 105 103 93 84 68
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...
Partly cloudy. Lows in the mid 50s. Highs in the upper 70s.
Minimum relative humidity around 28 percent. Southwest winds 4 to
8 mph.
.SATURDAY...
Mostly cloudy with chance of showers and thunderstorms. Lows in
the mid 50s. Highs in the lower 70s. Minimum relative humidity
around 40 percent. West winds 5 to 10 mph with gusts to 15 mph.
.SUNDAY...
Mostly cloudy. Chance of showers and thunderstorms. Lows in the
lower 50s. Highs in the upper 60s. Minimum relative humidity
around 40 percent. West winds 5 to 10 mph with gusts to 15 mph.
$$
Forecaster...Dziewaltowski/Myers
Requested by...Stan Mitchem
Type of request...WILDFIRE
.TAG 2619432.7/RIW
.DELDT 08/18/26
.FormatterVersion 2.0.0
.EMAIL paul_mitchem@firenet.gov,Stan@mitchem.com