Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
127
FNUS75 KRIW 212055
FWSRIW
Spot Forecast for Bare...USFS
National Weather Service Riverton WY
255 PM MDT Fri Aug 21 2026
Forecast is based on forecast start time of 0600 MDT on August 22.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Mostly cloudy skies and light winds to start Saturday morning
becoming partly cloudy by 11-1200. Increasing storm chances after
this point through 1900, with the best chances between 1200-1600
(~40%). Gusty outflow winds over 40 mph and lightning the main
hazards during this time. Light winds and increasing clouds after
1900 and into the overnight hours into Sunday morning. Afternoon
high temperatures Saturday about 3 to 5 degrees cooler than
Friday, with minimum relative humidity values down to 40 percent.
Mixing and smoke dispersal will be poor Saturday morning, becoming
only fair after 0900 as winds remain relatively light throughout
the entirety of the day. Similar conditions Sunday, and even
cooler into early next week.
...Thunderstorms imply strong gusty and erratic winds...
.SATURDAY...
Sky/weather.........Mostly cloudy (70-80 percent) then becoming
partly sunny (50-60 percent). Chance of showers
and thunderstorms in the afternoon.
CWR.................0 percent.
Chance of pcpn......35 percent.
Chance of thunder...35 percent.
Max temperature.....Around 72.
Min humidity........43 percent.
Wind (20 ft)........Light winds. Gusty and erratic winds expected
near thunderstorms in the afternoon.
Ridgetop wind.......Light winds until 0900, then south around
10 mph.
Mixing height.......1000 ft AGL until 0900, then 4500 ft AGL.
Transport winds.....Southwest 10 to 15 mph.
Smoke dispersal.....Poor until 0900, then fair.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........85 90 80 65 75 55 40 45 45 65 65 60
Weather cov..... CHC CHC CHC CHC CHC SCH
Weather type.... RW RW RW RW RW RW
Tstm cov........ CHC CHC CHC CHC CHC SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 10 30 30 30 30 30 10
Chc of thdr (%).0 0 0 0 10 10 30 30 30 40 30 10
Temp............58 57 57 61 65 68 71 72 72 72 71 71
RH..............64 69 72 67 55 49 46 45 43 43 46 47
20 FT wind dir..W SW SW E SE SW SW W W W W SW
20 FT wind spd..2 2 2 3 3 5 6 6 6 6 6 6
20 FT wind gust. 4 4 6 7 10 10 10 10 7
Ridge wind dir..W SW SW E SE SW SW W W W W SW
Ridge wind spd..5 5 5 10 10 10 10 15 15 15 15 10
Mix hgt (kft)...0.5 0.5 0.5 1.0 2.5 5.5 7.5 7.0 7.0 6.0 4.5 5.0
Transp wind dir.SW SW S S S SW SW W W W W W
Transp wind spd.9 9 9 8 9 12 15 15 14 13 14 12
SDspl kt-ft/10005 5 4 7 20 56 100 89 83 66 55 48
.SATURDAY NIGHT...
Sky/weather.........Mostly cloudy (50-60 percent) then becoming
partly cloudy (25-35 percent) then becoming
mostly cloudy (65-75 percent). Slight chance of
showers and thunderstorms early in the evening.
CWR.................0 percent.
Chance of pcpn......20 percent.
Chance of thunder...18 percent.
Min temperature.....Around 53.
Max humidity........74 percent.
Wind (20 ft)........Light winds after 1900. Gusty and erratic winds expected
near thunderstorms early in the evening.
Ridgetop wind.......Northwest around 10 mph until 2000, then west.
Mixing height.......4500 ft AGL until 2000, then 500 ft AGL.
Transport winds.....Southwest 10 to 15 mph.
Smoke dispersal.....Fair until 1900, then poor.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........55 55 50 40 15 10 25 30 55 85 80 70
Weather cov.....SCH SCH SCH SCH
Weather type....RW RW RW RW
Tstm cov........SCH SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).20 10 20 10 0 0 0 0 0 0 10 10
Chc of thdr (%).20 10 20 10 0 0 0 0 0 0 10 10
Temp............69 67 64 62 59 58 58 57 57 56 55 55
RH..............51 54 60 65 67 67 65 66 66 67 66 68
20 FT wind dir..W NW SW W W SW W W W W W W
20 FT wind spd..6 4 4 4 4 4 4 4 3 3 3 3
20 FT wind gust.12 10 7 7 6 6 7 6 6 6 6 6
Ridge wind dir..W NW SW W W SW W W W W W W
Ridge wind spd..10 10 10 10 10 10 10 10 10 10 10 10
Mix hgt (kft)...4.5 1.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.W SW SW SW W W W SW SW W W SW
Transp wind spd.13 9 9 9 9 9 9 9 10 13 10 10
SDspl kt-ft/100052 11 5 5 5 5 5 5 5 6 5 5
.SUNDAY...
Sky/weather.........Partly sunny (55-65 percent) then becoming
cloudy (90-100 percent) then becoming partly
sunny (55-65 percent) then becoming mostly
sunny (30-40 percent). Chance of showers and
thunderstorms in the afternoon.
CWR.................0 percent.
Chance of pcpn......40 percent.
Chance of thunder...37 percent.
Max temperature.....Around 72.
Min humidity........43 percent.
Wind (20 ft)........Light winds until 1100, then west 10 to 15 mph
with gusts to around 20 mph. Gusty and erratic
winds expected near thunderstorms in the
afternoon.
Ridgetop wind.......West around 10 mph until 1100, then west 15 to
20 mph until 1400.
Mixing height.......1500 ft AGL until 1100, then 6000 ft AGL.
Transport winds.....West 10 to 15 mph until 1100, then 15 to 20
mph.
Smoke dispersal.....Poor until 1100, then good.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........60 95 60 25 25 25 25 30 35 45 45 45
Weather cov..... CHC CHC CHC CHC CHC CHC
Weather type.... RW RW RW RW RW RW
Tstm cov........ CHC CHC CHC CHC CHC CHC
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).10 10 10 10 10 10 40 40 40 40 40 40
Chc of thdr (%).0 0 0 10 10 10 40 40 40 40 40 40
Temp............54 53 55 59 62 66 69 70 71 71 71 70
RH..............70 74 72 65 58 51 45 43 43 43 42 42
20 FT wind dir..W W W W W W W W W W W W
20 FT wind spd..3 3 2 2 4 6 9 10 11 11 11 10
20 FT wind gust.6 6 5 6 8 12 16 18 20 21 21 20
Ridge wind dir..W W W W W W W W W W W W
Ridge wind spd..10 10 5 5 10 15 15 15 20 20 20 15
Mix hgt (kft)...0.5 0.5 1.0 1.5 4.0 6.0 8.5 8.0 8.0 7.5 7.0 6.0
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.10 10 10 10 13 16 18 18 20 20 20 18
SDspl kt-ft/10005 5 9 12 41 86 136 132 135 130 118 100
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...
Partly cloudy. Showers likely and chance of thunderstorms. Lows
in the lower 50s. Highs in the lower 70s. Light winds.
.TUESDAY...
Mostly cloudy. Chance of showers and thunderstorms. Lows around
50. Highs in the lower 70s. Light winds.
.WEDNESDAY...
Partly cloudy. Slight chance of showers and thunderstorms. Lows
in the lower 50s. Highs in the lower 70s. Light winds.
$$
Forecaster...Lowe
Requested by...Stan Mitchem
Type of request...WILDFIRE
.TAG 2619432.10/RIW
.DELDT 08/21/26
.FormatterVersion 2.0.0
.EMAIL Stan@mitchem.com,paul_mitchem@firenet.gov