Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
849
FNUS75 KRIW 261129
FWSRIW
Spot Forecast for Spread Creek...USFS
National Weather Service Riverton WY
529 AM MDT Tue May 26 2026
Forecast is based on forecast start time of 0600 MDT on May 26.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Increased moisture will spread across the fire site as a weather
system moves through. The result will be an increased of showers
and afternoon thunderstorms. There is around a 20 percent chance
of a shower in the morning, but the best chance of a shower will
be between 1400 and 1800 when the chance increases to around 50
percent. The chance of a thunderstorm will peak during roughly
the same time, with a chance lingering until around 2100. Light
wind this morning will increase with gusts to near 15 knots
possible after 1200. A wind gust over 40 mph will be possible in
and near any shower or thunderstorm. Mixing and smoke dispersal
will become good after 1200 with morning inversions breaking
around 1000.
...Thunderstorms imply strong gusty and erratic winds...
.TODAY...
Sky/weather.........Mostly cloudy (70-80 percent). Slight chance of
rain showers in the morning, then rain showers
likely and chance of thunderstorms in the
afternoon.
CWR.................3 percent increasing to 23 percent in the
afternoon.
Chance of pcpn......60 percent.
Chance of thunder...39 percent.
Max temperature.....Around 65.
Min humidity........46 percent.
Wind (20 ft)........Light winds until 1200, then southeast 7 to 9
mph with gusts to around 14 mph. Gusty and
erratic winds expected near thunderstorms in
the afternoon.
Ridgetop wind.......Southeast 10 to 15 mph.
Mixing height.......1500 ft AGL until 1000, rising to 6500 ft AGL by
1400.
Transport winds.....Southeast 9 to 18 mph until 1300, then south 16
to 21 mph.
Smoke dispersal.....Poor until 1000, then becoming good to very good.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........80 85 85 80 80 75 85 80 70 65 70 65
Weather cov..... SCH SCH SCH SCH CHC CHC CHC LKY LKY CHC
Weather type.... RW RW RW RW RW RW RW RW RW RW
Tstm cov........ CHC CHC CHC CHC CHC CHC
CWR.............0 0 0 0 0 0 20 20 20 20 20 20
Chc of pcpn (%).10 20 20 20 10 20 30 40 40 60 60 50
Chc of thdr (%).0 0 0 10 10 10 30 30 30 40 40 40
Temp............44 45 47 57 61 59 59 62 64 64 65 64
RH..............59 60 62 53 51 53 52 51 47 46 47 50
20 FT wind dir..SE SE SE SE SE SE SE SE SE SE S S
20 FT wind spd..6 6 5 4 5 6 7 9 8 8 6 6
20 FT wind gust.10 8 7 6 7 8 11 14 13 13 8 8
Ridge wind dir..SE SE SE SE SE SE SE SE SE SE S S
Ridge wind spd..15 10 10 10 10 10 15 15 15 15 10 10
Mix hgt (kft)...0.5 0.5 0.5 1.5 4.0 5.0 5.5 5.0 6.0 6.5 5.5 4.0
Transp wind dir.SE SE SE S SE SE SE SE SE S S S
Transp wind spd.13 12 10 9 14 17 18 20 21 20 18 16
SDspl kt-ft/10006 6 6 14 50 71 86 89 106 108 89 53
.TONIGHT...
Sky/weather.........Mostly cloudy (55-65 percent) then becoming
partly cloudy (35-45 percent). Chance of
showers and thunderstorms in the evening.
CWR.................2 percent.
Chance of pcpn......30 percent.
Chance of thunder...25 percent.
Min temperature.....Around 43.
Max humidity........67 percent.
Wind (20 ft)........Light winds. Gusty and erratic winds expected
near thunderstorms early in the evening.
Ridgetop wind.......Southeast 10 to 15 mph.
Mixing height.......2500 ft AGL until 2000, then 500 ft AGL.
Transport winds.....South 9 to 13 mph.
Smoke dispersal.....Poor.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........65 65 55 55 55 65 60 50 40 40 30 35
Weather cov.....CHC SCH SCH SCH
Weather type....RW RW RW RW
Tstm cov........CHC SCH SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).30 20 20 20 10 10 20 10 0 0 0 0
Chc of thdr (%).30 20 20 10 10 10 0 0 0 0 0 0
Temp............62 61 59 55 52 51 49 48 47 47 44 44
RH..............54 58 59 64 65 64 61 61 61 63 66 65
20 FT wind dir..SE E E S SE SE SE SE SE SE SE SE
20 FT wind spd..5 4 5 6 6 5 6 6 6 6 6 6
20 FT wind gust.7 6 7 10 10 7 8 8 8 8 10 10
Ridge wind dir..SE E E S SE SE SE SE SE SE SE SE
Ridge wind spd..10 10 10 15 15 10 10 10 10 10 15 15
Mix hgt (kft)...3.5 2.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.S S S S S SE SE SE SE SE S SE
Transp wind spd.12 9 10 13 13 10 12 12 12 12 13 13
SDspl kt-ft/100037 19 6 6 6 5 6 6 5 5 5 6
.WEDNESDAY...
Sky/weather.........Mostly sunny (25-35 percent). A slight chance
of showers and thunderstorms after 1200.
CWR.................0 percent.
Chance of pcpn......15 percent.
Chance of thunder...15 percent.
Max temperature.....Around 72.
Min humidity........24 percent.
Wind (20 ft)........Light winds until 1400, then southeast 7 to 9
mph with gusts to around 14 mph. Gusty and
erratic winds expected near thunderstorms in
the afternoon.
Ridgetop wind.......Southeast 10 to 15 mph.
Mixing height.......1500 ft AGL until 0900, rising to 10000 ft AGL
by 1200.
Transport winds.....Southeast 8 to 16 mph until 1200, then 18 to 22
mph.
Smoke dispersal.....Poor until 0900, becoming excellent by 1200.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........30 20 15 25 15 30 45 35 30 30 25 30
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 10 10 10 10 10 10 10
Chc of thdr (%).0 0 0 0 0 10 10 10 10 10 10 10
Temp............43 44 47 55 62 64 65 66 69 69 70 70
RH..............67 67 67 55 45 39 34 33 30 29 27 26
20 FT wind dir..SE SE SE SE SE SE S SE SE SE SE SE
20 FT wind spd..5 5 3 3 4 6 6 6 7 8 8 9
20 FT wind gust.7 7 6 8 10 10 11 13 13 14
Ridge wind dir..SE SE SE SE SE SE S SE SE SE SE SE
Ridge wind spd..10 10 10 10 10 10 15 15 15 15 15 15
Mix hgt (kft)...0.5 0.5 1.5 3.0 5.5 7.5 9.5 9.5 9.5 10 9.5 9.5
Transp wind dir.SE SE SE S S S S SE S S SE SE
Transp wind spd.10 10 8 9 12 16 18 21 21 21 22 21
SDspl kt-ft/10005 6 11 22 54 108 148 172 173 176 182 170
.FORECAST DAYS 3 THROUGH 5...
.THURSDAY...
Mostly clear. Lows in the upper 40s. Highs in the mid 70s.
Southeast winds around 7 mph.
.FRIDAY...
Partly cloudy. Lows in the upper 40s. Highs in the lower 70s.
Southeast winds around 7 mph.
.SATURDAY...
Cooler. Mostly cloudy. Showers likely and chance of
thunderstorms. Lows in the upper 30s. Highs in the mid 50s. Light
winds.
$$
Forecaster...Hattings
Requested by...Kyler Knapp
Type of request...WILDFIRE
.TAG 2613964.7/RIW
.DELDT 05/26/26
.FormatterVersion 2.0.0
.EMAIL kyler.knapp@usda.gov