Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
901
FNUS75 KRIW 140038
FWSRIW
Spot Forecast for Telephone...USFS
National Weather Service Riverton WY
638 PM MDT Sun Sep 13 2026
Forecast is based on forecast start time of 0500 MDT on September 14.
If conditions become unrepresentative, contact the National Weather
Service
...HIGH WIND WARNING IN EFFECT FROM MONDAY 0000 to 1400 MDT...
.DISCUSSION...
Gusty west to northwest wind persists Monday following passage of a
cold front early Monday morning. Cooler and drier air filters into
western Wyoming Monday leading to cool temperatures and better
humidity recovery Monday night. Seasonal temperatures and much less
wind occur Tuesday. The end of the week sees a steady increase in
the chance of showers, while temperatures remain seasonal.
...Thunderstorms imply strong gusty and erratic winds...
.MONDAY...
Sky/weather.........Becoming mostly sunny (10-20 percent) early
in the morning.
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 58.
Min humidity........23 to 26 percent.
Wind (20 ft)........West to northwest wind 18 to 24 mph with gusts
to around 35 mph.
Ridgetop wind.......West to northwest 20 to 30 mph with gusts
35 to 45 mph.
Mixing height.......Less than 2000 ft AGL until 0900, then
gradually rising to around 5000 ft AGL by 1400.
Transport winds.....West 25 to 35 mph.
Smoke dispersal.....Fair until 0800, then gradually becoming
Very Good by 1400.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........25 15 10 5 5 5 5 10 10 10 10 5
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............35 33 34 41 48 51 53 55 55 57 57 57
RH..............66 63 56 42 35 31 29 27 26 25 24 24
20 FT wind dir..W W W W W W W W W W W W
20 FT wind spd..15 17 17 20 23 25 24 25 24 23 19 18
20 FT wind gust.20 23 23 29 32 35 33 35 33 32 26 26
Ridge wind dir..W W W W W W W W W W W W
Ridge wind spd..20 25 25 30 30 35 35 35 35 30 30 30
Mix hgt (kft)...0.5 0.5 1.0 3.0 3.5 4.0 4.5 5.0 5.0 5.5 5.5 5.0
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.22 24 24 29 32 35 33 35 33 32 29 28
SDspl kt-ft/100011 12 21 76 93 117 129 143 146 150 134 120
.MONDAY NIGHT...
Sky/weather.........Mostly clear (10-20 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....28 to 31.
Max humidity........68 to 71 percent.
Wind (20 ft)........West-northwest wind 14 to 22 mph with gusts
around 30 mph until 1900. After 1900, becoming
north-northwest 8 to 13 mph with gusts to
around 18 mph until 2100. Eventually becoming
north to northeast 5 to 10 mph by 0200.
Ridgetop wind.......Northwest 15 to 25 mph until 2200, then
becoming north to northeast around 10 mph
by 0200.
Mixing height.......4000 ft AGL until 2000, then becoming less than
1000 ft AGL by 2200.
Transport winds.....West-northwest 15 to 25 mph until 2100, then
becoming north 8 to 14 mph by 0100.
Smoke dispersal.....Good until 1900, then Poor by 2300.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........10 20 10 15 10 10 10 15 15 15 10 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............58 55 49 44 41 38 37 35 34 33 32 32
RH..............27 28 35 42 48 54 58 62 64 66 67 67
20 FT wind dir..W NW NW NW N N N N E E NE E
20 FT wind spd..13 10 8 6 6 5 4 3 3 3 2 2
20 FT wind gust.18 14 12 10 7 6 6 4 4 4
Ridge wind dir..W NW NW NW N N N N E E NE E
Ridge wind spd..20 15 15 15 10 10 10 10 10 10 5 5
Mix hgt (kft)...4.5 3.5 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 W N N N N NE NE NE E E
Transp wind spd.21 17 15 13 12 10 9 8 8 8 8 9
SDspl kt-ft/100082 50 9 6 6 5 4 4 4 4 4 4
.TUESDAY...
Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 66.
Min humidity........22 percent.
Wind (20 ft)........North-northwest wind 4 to 8 mph until 1200,
then becoming southwest 7 to 10 mph.
Ridgetop wind.......Northerly 5 to 10 mph until 1000, then
southwest 10 to 15 mph.
Mixing height.......Less than 2000 ft AGL until 1000, then gradually
increasing to 6000 ft AGL by 1400.
Transport winds.....North 5 to 10 mph until 1100, then gradually
becoming southwest 14 to 20 mph by 1300.
Smoke dispersal.....Poor until 1100, then becoming Very Good
by 1400.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........10 20 15 5 5 5 5 10 10 15 25 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............32 30 32 40 45 51 57 61 63 64 66 66
RH..............66 69 63 53 43 36 30 26 24 22 22 22
20 FT wind dir..SE E SE S S SW SW SW SW SW SW SW
20 FT wind spd..1 1 1 2 3 5 6 7 8 9 9 9
20 FT wind gust. 4 6 7 10 12 13 13 13
Ridge wind dir..SE E SE S S SW SW SW SW SW SW SW
Ridge wind spd..5 5 5 5 10 10 10 15 15 15 15 15
Mix hgt (kft)...0.5 0.5 0.5 1.5 2.0 3.0 3.5 5.5 6.0 6.0 6.0 5.5
Transp wind dir.SE E E SW SW SW SW W W SW SW SW
Transp wind spd.8 8 8 7 9 12 13 16 18 17 16 16
SDspl kt-ft/10004 4 5 9 17 30 39 88 108 102 82 75
.FORECAST DAYS 3 THROUGH 5...
.TUESDAY NIGHT...
Partly cloudy. Lows in the upper 30s. Wind becoming
downslope/downvalley 4 to 8 mph by 2000.
.WEDNESDAY...
Mostly sunny and dry in the morning. Partly cloudy with a
slight chance of showers and thunderstorms in the afternoon.
Highs in the upper 60s. Lows in the upper 30s. Southwest wind
10 to 15 mph.
.THURSDAY...
Becoming mostly cloudy with an increasing chance of showers
through the day along with a slight chance of thunderstorms.
Highs in the mid 60s. Lows in the upper 30s. Southwest wind
10 to 15 mph.
.FRIDAY...
Partly cloudy. Showers likely and slight chance of afternoon
thunderstorms. Highs in the mid 60s. Lows in the upper 30s.
Southwest 10 to 15 mph.
$$
Forecaster...CNJ
Requested by...Brandon Bones
Type of request...WILDFIRE
.TAG 2621796.0/RIW
.DELDT 09/14/26
.FormatterVersion 2.0.0
.EMAIL branbon.bonenberger@usda.gov