Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
898
FNUS75 KRIW 151927
FWSRIW
Spot Forecast for Bare...USFS
National Weather Service Riverton WY
127 PM MDT Sat Aug 15 2026
Forecast is based on forecast start time of 0600 MDT on August 16.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Drier air moves in for Sunday, with minimum humidity trending about
10 percent lower and high temperatures a few degrees warmer. Winds
will prevail from the west. Winds increase around noon, with
sustained speeds around 10 mph and gusts 15 to 20 mph through about
1900. Isolated showers and thunderstorms will be possible (15 to 25
percent chances) between 1300 and 1800. Outflow gusts up to about 40
mph are possible with showers or storms. Sunday night winds are
light, with humidity recovery into the mid-to-upper 60 percents.
Looking ahead, Monday should remain dry, with increasing clouds
ahead of increasing rain chances Monday night through Tuesday.
...Thunderstorms imply strong gusty and erratic winds...
.SUNDAY...
Sky/weather.........Sunny (20-30 percent) then becoming partly
sunny (50-60 percent) after 1200. Slight chance
of showers and thunderstorms between 1300 and 1700.
CWR.................0 percent.
Chance of pcpn......25 percent.
Chance of thunder...20 percent.
Max temperature.....Around 70.
Min humidity........30-34 percent.
Wind (20 ft)........Light west winds until 1200, then west around
10 mph with gusts 15 to 20 mph. Gusty and erratic
winds expected near thunderstorms in the afternoon.
Ridgetop wind.......Southwest around 10 mph until 0800, then west until 1600,
then 15 to 20 mph.
Mixing height.......1500 ft AGL until 1000. 9000 ft AGL after 1300.
Transport winds.....West 10 to 15 mph until 1600, then 15 to 20 mph.
Smoke dispersal.....Poor until 1000. Very good after 1400.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........10 20 15 5 15 25 45 55 50 60 50 45
Weather cov..... SCH SCH SCH SCH SCH
Weather type.... RW RW RW RW RW
Tstm cov........ 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 20 20 20 20
Chc of thdr (%).0 0 0 0 0 0 10 10 20 20 20 20
Temp............46 45 49 53 57 60 62 64 64 65 66 66
RH..............66 68 65 60 56 50 44 42 41 39 38 37
20 FT wind dir..SW SW W E E W W W W SW W W
20 FT wind spd..4 4 2 2 3 4 6 6 8 7 11 9
20 FT wind gust.6 6 4 6 10 10 11 10 14 13
Ridge wind dir..SW SW W E E W W W W SW W W
Ridge wind spd..10 10 5 5 10 10 15 15 15 15 20 15
Mix hgt (kft)...0.5 0.5 0.5 1.5 4.0 7.0 8.5 9.0 8.5 9.0 7.5 7.5
Transp wind dir.SW SW SW W W W W W W W W W
Transp wind spd.9 9 8 8 10 10 13 13 15 14 18 16
SDspl kt-ft/10005 5 4 11 38 62 95 97 111 105 123 108
.SUNDAY NIGHT...
Sky/weather.........Partly cloudy (25-35 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...5 percent.
Min temperature.....Around 47.
Max humidity........62-66 percent.
Wind (20 ft)........West winds around 10 mph until 1900, then light
west winds around 6 mph.
Ridgetop wind.......West 10 to 15 mph.
Mixing height.......6500 ft AGL until 1900. 500 ft AGL after 2000.
Transport winds.....West 8 to 14 mph.
Smoke dispersal.....Good until 1900. Poor after 2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........45 30 35 25 20 15 10 10 10 10 15 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 10 0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 10 0 0 0 0 0 0 0 0 0
Temp............68 66 63 58 55 54 53 52 52 51 49 49
RH..............35 40 46 51 55 57 57 58 58 59 60 63
20 FT wind dir..W N NW NW W W W W W W W W
20 FT wind spd..7 6 5 5 5 4 4 3 3 3 3 3
20 FT wind gust.10 8 6 6 6 6 6 6 6 6 6 5
Ridge wind dir..W N NW NW W W W W W W W W
Ridge wind spd..15 15 10 10 10 10 10 10 10 10 10 10
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 NW W NW W W SW W W SW SW SW
Transp wind spd.14 13 10 10 10 9 9 8 8 8 9 9
SDspl kt-ft/100079 31 5 5 5 4 4 4 4 4 5 5
.MONDAY...
Sky/weather.........Mostly sunny (35-50 percent), increasing through
the afternoon.
CWR.................0 percent.
Chance of pcpn......5 percent.
Chance of thunder...5 percent.
Max temperature.....Around 70.
Min humidity........30-34 percent.
Wind (20 ft)........Light southwest winds around 7 mph until 1100, then
winds west 8 to 10 mph with gusts to around 20 mph
Ridgetop wind.......West around 10 mph until 1000, then west 10 to 15 mph.
Mixing height.......1500 ft AGL until 1000. 9000 ft AGL after 1200.
Transport winds.....West 10 to 15 mph.
Smoke dispersal.....Poor until 1000. Very good after 1200.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........30 40 40 35 40 40 45 50 55 60 60 65
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............49 48 50 55 59 62 65 67 67 68 69 69
RH..............59 60 58 53 48 42 38 36 34 34 33 32
20 FT wind dir..W W SW SW SW SW W W W W W W
20 FT wind spd..3 2 2 2 3 4 6 6 7 8 8 8
20 FT wind gust.6 5 4 4 6 8 11 13 14 16 17 17
Ridge wind dir..W W SW SW SW SW W W W W W W
Ridge wind spd..10 5 5 5 10 10 10 15 15 15 15 15
Mix hgt (kft)...0.5 0.5 1.0 1.5 4.0 6.5 9.0 9.0 9.0 9.0 8.5 8.0
Transp wind dir.W SW SW SW SW W W W W W W W
Transp wind spd.8 9 8 7 9 12 14 15 15 16 16 16
SDspl kt-ft/10004 4 8 10 33 66 109 117 117 125 120 115
.FORECAST DAYS 3 THROUGH 5...
.TUESDAY...
Mostly cloudy. Chance of showers and thunderstorms starting Monday night
and continuing through the day. Lows around 50. Highs in the upper 60s.
West winds around 15 mph with gusts around 25 mph. Minimum humidity around
35 percent.
.WEDNESDAY...
Mostly cloudy. Slight chance of showers and thunderstorms in the afternoon.
Lows in the upper 40s. Highs in the upper 60s. West winds around 10 mph
with gusts around 20 mph. Minimum humidity around 30 percent.
.THURSDAY...
Partly cloudy. Lows in the upper 40s. Highs in the lower 70s. West winds
around 10 mph with gusts around 20 mph. Minimum humidity around 27 percent.
$$
Forecaster...Wittmann
Requested by...Stan Mitchem
Type of request...WILDFIRE
.TAG 2619432.4/RIW
.DELDT 08/15/26
.FormatterVersion 2.0.0
.EMAIL paul_mitchem@firenet.gov,Stan@mitchem.com