Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
440
FNUS75 KRIW 110311
FWSRIW
Spot Forecast for Telephone...USFS
National Weather Service Riverton WY
911 PM MDT Thu Sep 10 2026
Forecast is based on forecast start time of 0600 MDT on September 11.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
High clouds continue overnight, but no precipitation expected
before sunrise. West winds will stay elevated around 10 mph
through the night. Humidity recovery will be very good, reaching
near 70 percent.
Friday will see a very low chance for a light shower before 1000,
with decreasing clouds into the afternoon. Winds will again be
gusty from the west. Gusts of 25 to 30 mph will return by 1200 and
continue through the afternoon, decreasing around 2000. Humidity
levels will be higher than Thursday, remaining above 25 percent
through the afternoon.
...Thunderstorms imply strong gusty and erratic winds...
.TONIGHT...
Sky/weather.........Mostly cloudy (60-70 percent) then becoming
partly cloudy (35-45 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...1 percent.
Min temperature.....Around 45.
Max humidity........68 percent.
Wind (20 ft)........Northwest winds 7 to 13 mph with gusts to
around 24 mph until 0300, then around 10 mph.
Ridgetop wind.......Northwest 15 to 20 mph.
Mixing height.......5000 ft AGL until 1900. 500 ft AGL after 2000.
Transport winds.....West 14 to 23 mph.
Smoke dispersal.....Very good until 1900. Poor after 2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........70 65 60 55 50 45 40 35 30 30 35 45
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 10 10 10 10
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0
Temp............68 65 61 58 55 53 51 49 48 47 47 46
RH..............18 20 22 28 32 37 37 41 44 48 51 54
20 FT wind dir..W W W W NW NW NW NW NW NW NW NW
20 FT wind spd..13 11 10 9 8 8 8 8 7 6 6 7
20 FT wind gust.23 21 16 13 13 13 13 12 11 10 10 11
Ridge wind dir..W W W W NW NW NW NW NW NW NW NW
Ridge wind spd..20 20 15 15 15 15 15 15 15 15 15 15
Mix hgt (kft)...5.0 3.0 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.23 18 17 16 15 15 15 15 14 14 16 14
SDspl kt-ft/1000103 50 13 8 8 7 7 7 7 7 8 7
.FRIDAY...
Sky/weather.........Mostly sunny (35-45 percent). Isolated rain
showers early in the morning.
CWR.................1 percent.
Chance of pcpn......20 percent.
Chance of thunder...8 percent.
Max temperature.....Around 68.
Min humidity........23 percent.
Wind (20 ft)........West winds 7 to 16 mph with gusts to around 23
mph until 1300, then around 17 mph with gusts
to around 26 mph.
Ridgetop wind.......West 15 to 20 mph until 1200, then around 25
mph.
Mixing height.......2000 ft AGL until 1000, then 8000 ft AGL.
Transport winds.....West 14 to 18 mph until 1000. 31 to 36 mph
after 1300.
Smoke dispersal.....Poor until 0900, then Excellent.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........60 45 30 20 25 25 30 30 30 25 30 30
Weather cov.....ISO
Weather type....RW
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).20 10 10 0 10 10 10 10 0 0 0 0
Chc of thdr (%).10 10 10 0 10 10 10 10 0 0 0 0
Temp............45 45 45 55 60 62 65 67 66 68 68 68
RH..............59 65 68 56 45 39 34 30 29 26 25 24
20 FT wind dir..NW NW W W W W W W W W W W
20 FT wind spd..7 7 7 8 10 13 16 17 17 17 17 17
20 FT wind gust.11 11 12 13 16 19 23 25 26 26 26 26
Ridge wind dir..NW NW W W W W W W W W W W
Ridge wind spd..15 15 15 15 15 20 25 25 25 25 25 25
Mix hgt (kft)...0.5 0.5 1.0 2.0 4.0 6.0 7.0 7.5 6.5 7.5 8.0 8.0
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.14 15 14 18 24 29 32 35 35 36 35 31
SDspl kt-ft/10007 8 10 36 82 149 194 225 197 238 234 210
.FRIDAY NIGHT...
Sky/weather.........Partly cloudy (30-40 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...3 percent.
Min temperature.....Around 36.
Max humidity........78 percent.
Wind (20 ft)........West winds 9 to 16 mph with gusts to around 23
mph until 2100, then light.
Ridgetop wind.......West 20 to 25 mph until 2000, then northwest 10
to 15 mph until 0100, then north until 0200,
then southeast until 0500, then south.
Mixing height.......7500 ft AGL until 1900. 500 ft AGL after 2000.
Transport winds.....West 21 to 29 mph until 2000, then 9 to 16 mph
until 0300, then southwest 8 to 9 mph until
0500, then east around 8 mph.
Smoke dispersal.....Excellent until 1900. Poor after 2100.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........30 25 20 20 15 15 20 25 40 50 45 35
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............67 64 57 53 51 49 46 44 42 42 40 39
RH..............23 25 30 36 38 42 48 53 59 63 68 73
20 FT wind dir..W W W W W NW NW N E SE SE S
20 FT wind spd..16 13 9 6 5 5 4 4 4 4 3 3
20 FT wind gust.23 19 14 10 7 6 6 6
Ridge wind dir..W W W W W NW NW N E SE SE S
Ridge wind spd..25 20 15 15 10 10 10 10 10 10 10 10
Mix hgt (kft)...7.5 5.0 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.W W W W W W W SW SW SW SW E
Transp wind spd.29 21 16 13 10 10 9 9 9 9 8 8
SDspl kt-ft/1000182 91 17 7 5 5 5 5 5 6 4 4
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...
Partly cloudy. Chance of showers, slight chance of thunderstorms
and snow showers. Lows in the lower 40s. Highs in the mid 60s.
Southwest winds around 7 mph.
.MONDAY...
Mostly clear. Lows in the lower 30s. Highs around 60. West winds
around 13 mph.
.TUESDAY...
Mostly clear. Lows in the upper 20s. Highs in the lower 60s.
Light winds.
$$
Forecaster...Straub
Requested by...Dominic Manley
Type of request...WILDFIRE
.TAG 2621629.0/RIW
.DELDT 09/10/26
.FormatterVersion 2.0.0
.EMAIL trenton.jones@usda.gov,dominic.manley@usda.gov