Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
376
FNUS75 KRIW 071119
FWSRIW
Spot Forecast for Hams Fork Rx Unit 6/8...USFS
National Weather Service Riverton WY
519 AM MDT Sun Jun 7 2026
Forecast is based on ignition time of 0600 MDT on June 07.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Dry conditions expected with much of the storm activity to the
east and southeast throughout the day. Increasing southwest to
westerly winds up to 15 to 20 mph after 0800 peaking to 25 mph
gusts after 1200L. Therefore, smoke dispersal improves with the
stronger winds, best in the afternoon and early evening before
diminishing after 2100L and overnight into Monday morning. Not as
warm Sunday afternoon with temperatures around 10 to 15 mph cooler
than Saturday, and as a result, humidity values only down to
around the 35 percent mark. Otherwise, partly cloudy skies with a
weak frontal boundary turning winds with more of a northerly
component as they weaken after the 2100L timeframe.
...Thunderstorms imply strong gusty and erratic winds...
.TODAY...
Sky/weather.........Mostly sunny (30-40 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...6 percent.
Max temperature.....Around 60.
Min humidity........34 percent.
Wind (20 ft)........Light winds until 0800, then southwest 7 to 15
mph with gusts to around 20 mph.
Ridgetop wind.......Southwest 10 to 15 mph until 0800, then west 20
to 25 mph.
Mixing height.......1000 ft AGL until 0900. 7500 ft AGL after 1300.
Transport winds.....Southwest 9 to 18 mph until 1100, then 21 to 30
mph.
Smoke dispersal.....Poor until 0800, then good until 1200, increasing to
excellent in the afternoon and evening.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........50 50 45 55 60 50 40 30 15 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 10 10 0 0 0 10 10 0 0 0
Chc of thdr (%).0 0 0 10 10 0 10 10 10 0 0 0
Temp............48 48 50 51 54 54 56 57 58 58 58 56
RH..............51 56 52 52 48 52 51 51 47 42 42 40
20 FT wind dir..S SW SW SW SW SW SW SW W W W W
20 FT wind spd..4 4 7 9 11 12 13 14 14 15 14 13
20 FT wind gust.5 6 10 13 14 17 18 19 19 20 18 18
Ridge wind dir..S SW SW SW SW SW SW SW W W W W
Ridge wind spd..10 10 15 15 20 20 20 20 20 25 20 20
Mix hgt (kft)...0.5 0.5 1.0 2.5 4.0 5.0 6.0 7.0 7.5 7.0 7.0 6.0
Transp wind dir.S SW SW SW SW SW SW SW SW SW W W
Transp wind spd.9 9 14 16 18 21 25 28 30 29 29 25
SDspl kt-ft/10004 5 10 36 61 94 137 164 194 176 169 131
.TONIGHT...
Sky/weather.........Mostly clear (20-30 percent) then becoming
mostly cloudy (60-70 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 39.
Max humidity........42 percent.
Wind (20 ft)........West winds 9 to 12 mph with gusts to around 17
mph until 2100, then light.
Ridgetop wind.......Northwest 15 to 20 mph until 2200, then
northeast around 10 mph until 0200, then
southeast.
Mixing height.......4000 ft AGL until 2000. 500 ft AGL after 2100.
Transport winds.....West 16 to 23 mph until 2100, then north 9 to
13 mph until 0200, then northeast until 0300,
then southeast around 9 mph.
Smoke dispersal.....Very good early in the evening decreasing to
fair to poor after 2100.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........5 5 10 10 10 10 15 25 30 40 55 75
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............56 53 51 46 44 42 41 40 40 40 40 39
RH..............40 35 36 41 42 42 42 41 40 39 39 40
20 FT wind dir..W W NW NW N N NE NE E SE SE SE
20 FT wind spd..12 11 9 6 6 5 4 4 3 4 4 4
20 FT wind gust.17 14 12 10 7 6 6 5 4 5 5 5
Ridge wind dir..W W NW NW N N NE NE E SE SE SE
Ridge wind spd..20 20 15 15 10 10 10 10 10 10 10 10
Mix hgt (kft)...5.5 4.0 2.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.W W NW NW N N N N NE SE SE SE
Transp wind spd.23 20 16 13 12 10 9 9 8 9 9 9
SDspl kt-ft/1000108 71 33 6 5 5 4 4 4 4 4 4
.MONDAY...
Sky/weather.........Mostly cloudy (70-80 percent) then becoming
mostly sunny (45-55 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...1 percent.
Max temperature.....Around 65.
Min humidity........25 percent.
Wind (20 ft)........Light winds until 1000, then southwest 7 to 14
mph with gusts to around 19 mph.
Ridgetop wind.......South 10 to 15 mph until 1000, then southwest
15 to 20 mph.
Mixing height.......2000 ft AGL until 1000. 10000 ft AGL after
1300.
Transport winds.....Southeast 9 to 10 mph until 0800, then south 10
to 15 mph until 1100, then southwest 20 to 29
mph.
Smoke dispersal.....Poor until 1000, then fair to good until 1200,
then very good to excellent there after.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........80 90 85 60 60 65 70 65 65 45 55 50
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............41 43 45 50 55 59 62 63 64 65 63 63
RH..............41 42 41 37 33 31 30 28 26 26 26 25
20 FT wind dir..SE SE S S S SW SW SW SW SW SW SW
20 FT wind spd..5 4 5 6 7 8 10 12 12 14 14 13
20 FT wind gust.6 5 6 7 10 12 14 17 17 19 18 18
Ridge wind dir..SE SE S S S SW SW SW SW SW SW SW
Ridge wind spd..10 10 10 10 15 15 15 20 20 20 20 20
Mix hgt (kft)...0.5 0.5 1.5 2.0 3.5 5.0 7.0 9.0 10 10 9.5 9.0
Transp wind dir.SE S S S S SW SW SW SW SW SW SW
Transp wind spd.10 9 10 12 15 20 25 24 25 29 26 24
SDspl kt-ft/10005 5 12 21 47 88 149 185 219 245 223 187
.FORECAST DAYS 3 THROUGH 5...
.TUESDAY...
Mostly cloudy with chance of showers and thunderstorms. Lows in
the mid 40s. Highs in the mid 50s. Southwest winds around 9 mph.
.WEDNESDAY...
Partly cloudy. Chance of showers, snow showers and slight chance
of thunderstorms. Lows in the mid 30s. Highs around 50. West
winds around 12 mph.
.THURSDAY...
Mostly clear. Lows around 30. Highs in the mid 50s. West winds
around 9 mph.
$$
Forecaster...Lowe
Requested by...Michael McEwen
Type of request...PRESCRIBED
.TAG 2614723.6/RIW
.DELDT 06/07/26
.FormatterVersion 2.0.0
.EMAIL michael.mcewen@usda.gov