Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
102
FNUS75 KRIW 292042
FWSRIW
Spot Forecast for Willow Creek Fire...BLM
National Weather Service Riverton WY
242 PM MDT Fri Aug 29 2025
Forecast is based on forecast start time of 1800 MDT on August 29.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Light northwest winds start the day Saturday, with speeds 5 to 7
mph. Winds shift to be northerly around 1200L, increasing to around
10 mph. Gusty winds to around 20 mph will occur through the
afternoon. A mostly clear sky all day, with no rain expected. Winds
Saturday night shift to be from the northeast around 0100L and then
from the east by around 0500L. Speeds will be under 10 mph
overnight, after midnight. Temperatures and RHs Saturday will be
similar to Friday, with a high in the mid-60s and minimum RHs around
30 percent. Looking ahead, temperatures trend warmer Sunday through
Tuesday, with RHs trending slightly down.
...Thunderstorms imply strong gusty and erratic winds...
.TONIGHT...
Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 48.
Max humidity........60-70 percent.
Wind (20 ft)........North winds 7 to 10 mph with gusts to around 15
mph until 2400, then light north wind.
Ridgetop wind.......North 10 to 15 mph.
Mixing height.......6500 ft AGL until 1900.
Transport winds.....North 10 to 15 mph.
Smoke dispersal.....Very good early in the evening decreasing to
good late in the night until 1900. Poor after
2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........30 30 30 25 25 20 20 15 15 25 20 10
Weather cov..... PTY PTY PTY PTY PTY PTY PTY PTY PTY
Weather type.... SMK SMK SMK SMK SMK SMK SMK SMK SMK
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 62 58 55 54 52 51 50 50 50 49 49
RH..............35 39 45 49 51 54 55 58 59 61 61 63
20 FT wind dir..N N N N N N N N N N N N
20 FT wind spd..10 9 10 9 8 7 6 6 6 6 6 6
20 FT wind gust.14 14 14 13 12 10 10 10 10 8 7 7
Ridge wind dir..N N N N N N N N N N N N
Ridge wind spd..15 15 15 15 10 10 10 10 10 10 10 10
Mix hgt (kft)...6.5 2.5 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
Transp wind dir.N N N N N N N N N N N N
Transp wind spd.16 15 14 13 12 10 10 10 9 9 9 9
SDspl kt-ft/1000126 66 17 15 13 13 13 13 12 12 12 12
.SATURDAY...
Sky/weather.........Sunny (5-15 percent).
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Upper-60s.
Min humidity........24-28 percent.
Wind (20 ft)........Light north to northwest winds until 1100, then
north around 10 mph with gusts to around 15 mph.
Ridgetop wind.......Northwest around 10 mph until 1100, then north
10 to 15 mph.
Mixing height.......7500 ft AGL after 1300.
Transport winds.....Northeast 10 mph until 0900, then northwest
8 to 15 mph.
Smoke dispersal.....Poor until 1000 increasing to very good in
the afternoon after 1200.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........10 10 10 0 5 5 5 15 15 10 5 5
Weather cov.....PTY PTY PTY PTY PTY PTY
Weather type....SMK SMK SMK SMK SMK SMK
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 51 56 60 63 65 67 67 68 69 68
RH..............60 60 58 52 44 37 33 31 29 28 27 26
20 FT wind dir..NW NE W W NW NW N N N N N N
20 FT wind spd..5 5 4 4 5 6 7 8 9 9 9 10
20 FT wind gust.6 7 6 6 6 10 10 12 13 13 13 14
Ridge wind dir..NW NE W W NW NW N N N N N N
Ridge wind spd..10 10 10 5 10 10 15 15 15 15 15 15
Mix hgt (kft)...0.1 0.1 0.1 0.5 2.0 4.0 5.5 7.0 7.5 7.5 7.5 7.0
Transp wind dir.NE NE NE NW NW NW NW NW NW N N N
Transp wind spd.9 9 8 7 9 12 14 14 15 15 15 16
SDspl kt-ft/100012 12 10 13 32 68 91 109 120 130 131 126
.SATURDAY NIGHT...
Sky/weather.........Mostly clear (5-15 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 47.
Max humidity........50-54 percent.
Wind (20 ft)........North winds around 8 mph with gusts to around 15
mph until 2300, then 10 mph or less north to northeast
until 0200, then east to southeast.
Ridgetop wind.......North 10 to 15 mph until 0100, then east.
Mixing height.......6500 ft AGL until 1900.
Transport winds.....North 10 to 15 mph until 0200, then east around
8 mph.
Smoke dispersal.....Very good early in the evening decreasing to
good late in the night until 1900. Poor after
2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........10 10 10 10 15 10 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............66 64 60 56 55 53 52 51 51 50 49 48
RH..............27 32 36 41 43 47 49 50 50 51 52 54
20 FT wind dir..N NW N N N N NE NE E E E E
20 FT wind spd..9 8 8 7 8 6 6 6 5 5 5 5
20 FT wind gust.14 12 11 10 11 8 8 8 8 7 7 7
Ridge wind dir..N NW N N N N NE NE E E E E
Ridge wind spd..15 15 15 10 10 10 10 10 10 10 10 10
Mix hgt (kft)...6.5 1.5 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
Transp wind dir.N N N N N N NE NE NE NE E E
Transp wind spd.16 15 13 12 10 10 9 9 9 8 8 8
SDspl kt-ft/1000111 43 16 15 13 13 12 12 10 10 10 10
.SUNDAY...
Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 70.
Min humidity........23-27 percent.
Wind (20 ft)........Light southeast winds until 1000, turning south
and then west around 8 mph by around 0100.
Afternoon gusts 10 to 14 mph.
Ridgetop wind.......East around 10 mph until 0800, then light until
1000, then south around 10 mph until 1200, then
west.
Mixing height.......8500 ft AGL after 1500.
Transport winds.....Southeast around 8 mph until 1100, then southwest
around 9 mph until 1500, then west around 10 mph.
Smoke dispersal.....Poor until 1000 increasing to good in the afternoon
after 1500.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........5 5 5 0 5 5 5 5 5 10 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............48 50 52 55 59 63 66 68 69 69 70 70
RH..............54 54 52 48 42 36 30 27 26 25 24 24
20 FT wind dir..E E E E SE SW SW W W W W NW
20 FT wind spd..5 5 4 4 4 5 5 6 6 6 6 5
20 FT wind gust.7 7 6 6 6 7 8 10 10 11 11 11
Ridge wind dir..E E E E SE SW SW W W W W NW
Ridge wind spd..10 10 5 5 10 10 10 10 10 10 10 10
Mix hgt (kft)...0.1 0.1 0.1 0.1 2.0 4.0 6.0 7.0 7.5 8.5 7.5 7.0
Transp wind dir.SE SE SE SE SE S SW SW W W W W
Transp wind spd.8 8 7 7 8 8 9 9 9 10 10 10
SDspl kt-ft/100010 11 12 13 27 46 70 77 84 91 87 81
.FORECAST DAYS 3 THROUGH 5...
.LABOR DAY...
Clear. Lows around 50. Highs in the low 70s. Southwest winds
around 10 mph.
.TUESDAY...
Mostly clear. Lows in the lower 50s. Highs in the mid 70s.
Afternoon west winds around 10 mph.
.WEDNESDAY...
Mostly clear. Lows around 50. Highs in the mid 70s.
Afternoon northwest winds around 10 mph, with gusts around 15 mph.
$$
Forecaster...Wittmann
Requested by...Dionysius Nicolas - Plans Section
Type of request...WILDFIRE
.TAG 2520679.3/RIW
.DELDT 08/29/25
.FormatterVersion 2.0.0
.EMAIL dnicolas@blm.gov,dionysius-caesar_nicolas@firenet.gov