Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
512
FNUS75 KRIW 121105
FWSRIW
Spot Forecast for Hams Fork RX Unit 8/6...USFS
National Weather Service Riverton WY
505 AM MDT Fri Jun 12 2026
Forecast is based on ignition time of 0800 MDT on June 12.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Dry conditions expected today under mainly clear skies. Afternoon
temperatures about 10 degrees warmer than Thursday, giving way to
lower minimum relative humidity values down to around 20 to 25
percent. Good RH recovery overnight with a few more clouds as
well. Light southwest winds around 5 to 10 mph until 0900L before
increasing to 20 to 25 mph gusts after noon through 2100L. Winds
diminish there after, and as a result, smoke dispersal will be
very good during the gusty wind period before becoming poor. A bit
less wind and cooler Saturday before a warming trend Sunday onward
with dry conditions continuing as well.
...Thunderstorms imply strong gusty and erratic winds...
.TODAY...
Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 67.
Min humidity........23 percent.
Wind (20 ft)........Light winds until 1100, then west 7 to 10 mph.
Ridgetop wind.......Light winds until 0800, then west 10 to 15 mph.
Mixing height.......2000 ft AGL until 1000. 6500 ft AGL after 1300.
Transport winds.....Southwest 7 to 8 mph until 0900, then west 9 to
18 mph until 1200, then 20 to 23 mph.
Smoke dispersal.....Poor until 0900. Very good there after.
TIME (MDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........0 0 0 0 0 0 5 5 5 5
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0
Temp............47 52 55 58 60 62 63 65 65 66
RH..............40 35 35 32 31 30 29 26 27 27
20 FT wind dir..SW SW W W W W W W W W
20 FT wind spd..3 4 6 7 8 9 10 10 10 10
20 FT wind gust.4 6 7 10 12 13 14 14 14 14
Ridge wind dir..SW SW W W W W W W W W
Ridge wind spd..10 10 10 15 15 15 15 15 15 15
Mix hgt (kft)...0.5 2.0 3.5 4.5 5.0 5.5 6.0 6.0 6.0 6.5
Transp wind dir.SW W W W W W W W W W
Transp wind spd.8 9 15 18 20 22 22 23 23 23
SDspl kt-ft/10005 15 43 69 82 106 112 121 124 126
.TONIGHT...
Sky/weather.........Clear (0-10 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 45.
Max humidity........44 percent.
Wind (20 ft)........West winds 8 to 10 mph until 2100, then light.
Ridgetop wind.......West 10 to 15 mph until 0400, then southeast
until 0500, then light.
Mixing height.......5500 ft AGL until 2000, then 500 ft AGL.
Transport winds.....West 15 to 23 mph until 2100, then 8 to 12 mph.
Smoke dispersal.....Very good until 2100, then poor.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........0 5 10 10 5 5 5 5 5 5 5 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............65 65 62 57 54 53 51 50 50 49 47 46
RH..............28 27 30 35 37 36 37 37 37 38 40 42
20 FT wind dir..W W W W W W W SW SW SW SE SE
20 FT wind spd..10 9 8 6 5 4 3 3 3 3 3 2
20 FT wind gust.14 13 12 7 6 6 4 4 4 4 4
Ridge wind dir..W W W W W W W SW SW SW SE SE
Ridge wind spd..15 15 15 10 10 10 10 10 10 10 10 5
Mix hgt (kft)...6.5 5.5 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 22 15 12 10 12 10 12 10 9 8 8
SDspl kt-ft/1000127 104 12 6 5 6 5 5 5 5 4 4
.SATURDAY...
Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 67.
Min humidity........24 percent.
Wind (20 ft)........Light winds until 1300, then west 7 to 8 mph.
Ridgetop wind.......Light winds until 0900, then west 10 to 15 mph.
Mixing height.......1000 ft AGL until 0900. 7000 ft AGL after 1500.
Transport winds.....West 7 to 16 mph until 1200, then 18 to 20 mph.
Smoke dispersal.....Poor until 1200. Very good there after.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........0 10 5 0 0 0 0 5 10 5 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............45 47 51 55 58 61 63 65 66 67 67 66
RH..............44 44 40 37 34 31 29 27 25 24 24 24
20 FT wind dir..SE SW W W W W W W W W W W
20 FT wind spd..2 2 2 4 5 6 6 7 7 8 8 8
20 FT wind gust. 6 6 7 7 10 10 12 12 12
Ridge wind dir..SE SW W W W W W W W W W W
Ridge wind spd..5 5 5 10 10 10 10 15 15 15 15 15
Mix hgt (kft)...0.5 0.5 1.0 3.0 4.0 5.0 6.0 6.0 6.5 7.0 6.5 6.5
Transp wind dir.W W W W W W W W W W W W
Transp wind spd.7 7 7 10 14 16 20 20 20 20 18 18
SDspl kt-ft/10003 3 7 26 48 70 101 106 113 115 106 101
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...
Clear. Lows in the lower 40s. Highs in the upper 60s. Light
winds.
.MONDAY...
Mostly clear. Lows in the lower 40s. Highs around 70. Light
winds.
.TUESDAY...
Partly cloudy. Lows in the upper 40s. Highs in the lower 70s.
Light winds.
$$
Forecaster...Lowe
Requested by...Greg Gamertsfelder
Type of request...PRESCRIBED
.TAG 2615181.3/RIW
.DELDT 06/12/26
.FormatterVersion 2.0.0
.EMAIL Greg.gamertsfelder@usda.gov