Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
825
FNUS75 KRIW 301203
FWSRIW
Spot Forecast for Bull Fire...USFS BTF
National Weather Service Riverton WY
603 AM MDT Tue Sep 30 2025
Forecast is based on forecast start time of 0700 MDT on September 30.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
There is a 10% chance for showers, increasing to 40% by 0900.
Showers and thunderstorms (50% chance) will be possible through
the afternoon, with most of the activity ending by 1800 this
evening. Wind gusts up to 40 mph will be the main threat. There is
a 10% chance for locally heavy rain to occur with the stronger
storms. Another round of weak showers will be possible again by
0300 Wednesday morning. Drier conditions will be in place
Wednesday, with an isolated shower or two possible through the
day.
...Thunderstorms imply strong gusty and erratic winds...
.TODAY...
Sky/weather.........Mostly cloudy (65-75 percent) then becoming
partly sunny (60-70 percent). Chance of rain
showers and slight chance of thunderstorms in
the morning, then rain showers likely and
chance of thunderstorms in the afternoon.
CWR.................3 percent increasing to 48 percent in the
afternoon.
Chance of pcpn......60 percent.
Chance of thunder...34 percent.
Max temperature.....Around 51.
Min humidity........68 percent.
Wind (20 ft)........Southwest winds 7 to 14 mph with gusts to
around 19 mph. Gusty and erratic winds expected
near thunderstorms in the late morning and
afternoon.
Ridgetop wind.......Southwest 15 to 20 mph.
Mixing height.......4000 ft AGL after 1100.
Transport winds.....Southwest 14 to 22 mph.
Smoke dispersal.....Poor until 1100, then fair until 1200, then
good until 1400.
TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........85 75 55 45 60 70 75 80 80 80 75
Weather cov.....SCH CHC CHC CHC CHC CHC LKY CHC CHC CHC CHC
Weather type....RW RW RW RW RW RW RW RW RW RW RW
Tstm cov........ SCH SCH SCH CHC CHC CHC CHC CHC CHC
CWR.............0 0 0 0 0 50 50 50 50 50 50
Chc of pcpn (%).20 30 40 40 30 50 60 50 50 50 30
Chc of thdr (%).0 0 10 10 10 30 30 30 30 30 30
Temp............42 41 43 47 48 50 48 46 44 43 43
RH..............86 91 90 77 80 70 78 85 90 91 90
20 FT wind dir..S S SW SW SW SW SW SW SW SW SW
20 FT wind spd..7 7 8 10 12 14 13 12 10 10 9
20 FT wind gust.14 14 16 17 18 19 19 18 18 18 17
Ridge wind dir..S S SW SW SW SW SW SW SW SW SW
Ridge wind spd..15 15 15 15 20 20 20 20 15 15 15
Mix hgt (kft)...0.1 0.1 1.0 2.0 3.0 4.0 3.5 2.5 2.5 2.5 2.5
Transp wind dir.SW SW S SW SW SW SW SW SW SW SW
Transp wind spd.14 14 15 17 20 22 21 20 20 20 16
SDspl kt-ft/10003 3 10 29 51 72 63 43 46 42 35
.TONIGHT...
Sky/weather.........Mostly cloudy (60-70 percent) then becoming
partly cloudy (45-55 percent) then becoming
mostly cloudy (65-75 percent). Chance of rain
showers and slight chance of thunderstorms.
CWR.................2 percent increasing to 25 percent overnight.
Chance of pcpn......50 percent.
Chance of thunder...23 percent.
Min temperature.....Around 37.
Max humidity........94 percent.
Wind (20 ft)........Southwest winds 7 to 9 mph with gusts to around
16 mph until 2200, then light. Gusty and
erratic winds expected near thunderstorms.
Ridgetop wind.......Southwest 10 to 15 mph.
Mixing height.......500 ft AGL until 2300, then 500 ft AGL after
0300 until 0400.
Transport winds.....Southwest 10 to 16 mph.
Smoke dispersal.....Poor.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........70 60 55 45 45 50 50 60 70 80 70 55
Weather cov.....CHC CHC SCH SCH SCH SCH SCH SCH CHC CHC CHC CHC
Weather type....RW RW RW RW RW RW RW RW RW RW RW RW
Tstm cov........SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH
CWR.............0 0 0 0 0 0 30 30 30 30 30 30
Chc of pcpn (%).30 30 20 20 20 10 10 20 40 50 50 50
Chc of thdr (%).20 20 20 10 10 10 10 10 10 10 10 10
Temp............43 42 41 41 40 39 38 38 38 39 38 38
RH..............89 89 90 91 91 92 93 93 94 94 94 94
20 FT wind dir..SW SW SW SW SW SW SW SW SW SW SW SW
20 FT wind spd..9 9 8 7 6 6 5 6 6 6 6 6
20 FT wind gust.16 16 14 14 12 10 8 7 8 10 8 8
Ridge wind dir..SW SW SW SW SW SW SW SW SW SW SW SW
Ridge wind spd..15 15 15 15 15 10 10 10 10 10 10 10
Mix hgt (kft)...2.0 1.5 0.5 0.5 0.5 0.1 0.1 0.1 0.1 0.5 0.1 0.1
Transp wind dir.SW SW SW W SW SW SW SW SW SW SW SW
Transp wind spd.16 16 15 14 13 12 10 12 12 12 12 12
SDspl kt-ft/100030 20 3 3 3 2 2 2 2 3 2 2
.WEDNESDAY...
Sky/weather.........Mostly sunny (35-45 percent). Chance of rain
showers and slight chance of thunderstorms.
CWR.................0 percent.
Chance of pcpn......30 percent.
Chance of thunder...20 percent.
Max temperature.....Around 52.
Min humidity........62 percent.
Wind (20 ft)........Light winds until 1200, then southwest 7 to 8
mph with gusts to around 14 mph. Gusty and
erratic winds expected near thunderstorms.
Ridgetop wind.......Southwest 10 to 15 mph.
Mixing height.......500 ft AGL until 0800, then 2000 ft AGL after
0900 until 1100, then 4000 ft AGL until 1500,
then 4500 ft AGL.
Transport winds.....Southwest 10 to 17 mph.
Smoke dispersal.....Poor until 1200, then fair until 1500, then
increasing to good in the afternoon until
1700, then poor.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........40 45 45 40 25 40 50 50 45 45 40 35
Weather cov.....CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC
Weather type....RW RW RW RW RW RW RW RW RW RW RW RW
Tstm cov........SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).30 30 30 30 30 30 30 30 30 30 30 30
Chc of thdr (%).10 10 10 10 10 10 20 20 20 20 20 20
Temp............37 38 38 40 44 46 48 49 51 51 51 51
RH..............94 90 90 89 80 75 72 68 65 63 61 60
20 FT wind dir..SW S S S S SW SW SW W W W SW
20 FT wind spd..6 5 5 5 6 6 7 8 8 8 8 7
20 FT wind gust.8 7 8 10 11 13 14 14 14 14 14 14
Ridge wind dir..SW S S S S SW SW SW W W W SW
Ridge wind spd..10 10 10 10 10 15 15 15 15 15 15 15
Mix hgt (kft)...0.5 0.5 0.1 0.5 2.0 2.5 3.5 4.0 4.0 4.5 4.0 3.5
Transp wind dir.SW SW S SW SW SW SW SW SW SW SW SW
Transp wind spd.12 10 10 10 12 13 14 15 16 17 16 14
SDspl kt-ft/10003 4 1 4 18 29 42 50 58 67 55 40
.FORECAST DAYS 3 THROUGH 5...
.THURSDAY...
Mostly clear. Slight chance of showers. Lows around 40. Highs in
the mid 50s. Southwest winds 12-20 mph.
.FRIDAY...
Mostly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the lower 40s. Highs in the lower 50s.
West-southwest winds 10-18 mph.
.SATURDAY...
Colder. Mostly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the upper 30s. Highs in the lower 40s.
West 9-17 mph winds.
$$
Forecaster...LaVoie
Requested by...Matt Ziegler
Type of request...WILDFIRE
.TAG 2522667.2/RIW
.DELDT 09/30/25
.FormatterVersion 2.0.0
.EMAIL wytdc@firenet.gov