520
FNUS75 KRIW 171142
FWSRIW

Spot Forecast for Upper Gros Ventre RX...BTNF
National Weather Service Riverton WY
542 AM MDT Sat Oct 17 2026

Forecast is based on ignition time of 0700 MDT on October 17.
If conditions become unrepresentative, contact the National Weather
Service

.DISCUSSION...

Skies remain mostly sunny again today, with no precipitation
expected. Winds will start light from the southeast, before
switching back from the west during the afternoon. Overall wind
speeds remain light, mainly under 5 mph through the day. Low
mixing heights and light winds will bring poor smoke dispersal.

Expect similar conditions on Sunday, with mostly sunny skies,
light west winds during the afternoon, and poor smoke dispersal.

.REST OF TODAY...

Sky/weather.........Sunny (20-30 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 60.
Min humidity........22 percent.
Wind (20 ft)........Light winds.
Ridgetop wind.......Southeast around 10 mph until 1100, then west.
Mixing height.......2000 ft AGL until 1300, then 3500 ft AGL.
Transport winds.....Southwest 8 to 14 mph until 1300, then west 16
                    to 18 mph.
Smoke dispersal.....Poor until 1300, then fair.

TIME (MDT)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........40  35  15  15  15  10  10  20  15  35  35
Weather cov.....
Weather type....
Tstm cov........
CWR.............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
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0
Temp............27  27  34  47  53  56  59  59  59  60  58
RH..............67  64  53  37  31  24  23  23  22  24  26
20 FT wind dir..SE  SE  SE  S   SW  W   W   W   W   W   W
20 FT wind spd..3   4   4   4   4   4   4   6   6   6   5
20 FT wind gust.4       6   6   6   6   11  13  14  14  11
Ridge wind dir..SE  SE  SE  S   SW  W   W   W   W   W   W
Ridge wind spd..10  10  10  10  10  10  10  10  15  10  10
Mix hgt (kft)...0.5 0.5 0.5 1.0 1.5 2.0 3.0 3.5 3.5 3.0 2.5
Transp wind dir.S   S   S   SW  SW  SW  W   W   W   W   W
Transp wind spd.8   9   9   9   12  14  16  18  18  17  16
SDspl kt-ft/10004   4   3   7   16  27  41  52  58  47  36

.TONIGHT...

Sky/weather.........Partly cloudy (30-40 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 26.
Max humidity........65 percent.
Wind (20 ft)........Light winds.
Ridgetop wind.......West around 10 mph until 2000, then southeast.
Mixing height.......500 ft AGL.
Transport winds.....Southwest 8 to 10 mph until 0500, then south
                    around 8 mph.
Smoke dispersal.....Poor.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........35  30  40  45  25  30  25  35  40  45  30  35
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............52  46  39  36  33  32  31  30  30  29  28  27
RH..............35  44  49  57  62  64  65  65  65  65  64  65
20 FT wind dir..W   W   E   E   SE  SE  SE  E   E   SE  SE  SE
20 FT wind spd..3   3   3   5   4   4   3   3   3   3   3   3
20 FT wind gust.8   7   8   10  8   6   6   5   5   5   5   5
Ridge wind dir..W   W   E   E   SE  SE  SE  E   E   SE  SE  SE
Ridge wind spd..10  10  10  10  10  10  10  10  10  10  10  10
Mix hgt (kft)...1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.SW  SW  SW  S   S   SW  S   S   S   S   S   S
Transp wind spd.10  8   8   10  9   9   8   8   8   8   8   8
SDspl kt-ft/100010  3   4   5   4   4   4   3   3   4   4   4

.SUNDAY...

Sky/weather.........Mostly sunny (30-40 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 57.
Min humidity........26 percent.
Wind (20 ft)........Light winds.
Ridgetop wind.......Southeast around 10 mph until 0700, then west
                    around 10 mph.
Mixing height.......2000 ft AGL until 1200, then 5000 ft.
Transport winds.....Southeast 7 to 8 mph until 1000, then light
                    until 1200, then southwest 7 to 14 mph.
Smoke dispersal.....Poor until 1300, increasing to good in the
                    afternoon.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........35  40  25  25  30  30  25  35  35  40  25  30
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............27  26  26  31  44  49  53  54  55  55  57  55
RH..............65  66  65  56  40  34  28  27  27  26  26  27
20 FT wind dir..SE  SE  SE  SE  S   SW  W   W   W   W   W   W
20 FT wind spd..3   2   2   3   1   1   2   3   4   5   5   3
20 FT wind gust.5   4   4   6   5   4   6   7   10  11  10  8
Ridge wind dir..SE  SE  SE  SE  S   SW  W   W   W   W   W   W
Ridge wind spd..10  5   5   10  5   5   5   10  10  10  10  10
Mix hgt (kft)...0.5 0.5 0.5 0.5 1.0 2.0 3.0 4.5 5.0 5.0 4.0 3.0
Transp wind dir.S   SE  SE  S   S   SW  SW  SW  SW  W   W   SW
Transp wind spd.8   7   7   8   6   6   7   12  14  10  13  12
SDspl kt-ft/10003   3   2   2   5   10  18  44  60  44  46  32

.FORECAST DAYS 3 THROUGH 5...
.MONDAY...
Mostly clear. Lows in the mid 20s. Highs in the upper 50s. Light
winds.
.TUESDAY...
Partly cloudy. Slight chance of showers and thunderstorms. Lows
in the upper 20s. Highs in the mid 50s. Light winds.
.WEDNESDAY...
Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the lower 30s. Highs in the upper 50s.
Light winds.

$$
Forecaster...Straub
Requested by...Eric Hawes
Type of request...PRESCRIBED
.TAG 2623595.5/RIW
.DELDT 10/17/26
.FormatterVersion 2.0.0
.EMAIL eric.hawes@usda.gov