615
FNUS75 KRIW 190154
FWSRIW

Spot Forecast for Spring Creek...BLM
National Weather Service Riverton WY
754 PM MDT Mon Aug 18 2025

Forecast is based on forecast start time of 2000 MDT on August 18.
If conditions become unrepresentative, contact the National Weather
Service

.DISCUSSION...
Conditions are mostly clear, dry, and warmer through Wednesday
morning as high pressure is in place and moisture is limited.
However, there is a hint of increasing mid-level moisture late in
the day Wednesday, which could fuel a few high-based, mostly dry,
showers and thunderstorms between 1700L and 2000L. Gusty outflow
wind would be the primary hazard. Otherwise, daytime temperatures
rise both Tuesday and Wednesday, as readings climb to 5 to 10
degrees above normal. Overnight humidity recovery will be poor
through at least Wednesday night.

...Thunderstorms imply strong gusty and erratic winds...

.REST OF TONIGHT...

Sky/weather.........Mostly clear (10-20 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....64 to 67.
Max humidity........35 to 38 percent.
Wind (20 ft)........East wind 9 to 13 with occasional gusts
                    around 19 mph until 2200L, then decreasing
                    to 7 to 10 mph by 0100L.
Ridgetop wind.......East around 15 mph.
Mixing height.......Decreasing to less than 1500 ft AGL
                    by 2100L.
Transport winds.....East 10 to 15 mph until 2300L, then
                    decreasing to 10 mph by 0100L.
Smoke dispersal.....Becoming Poor by 2100L.

TIME (MDT)      8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........20  20  20  20  15  15  10  10  10  10
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............79  76  75  74  73  72  71  71  70  70
RH..............20  22  24  27  29  30  31  32  32  33
20 FT wind dir..NE  E   E   E   E   E   E   E   E   E
20 FT wind spd..7   10  12  13  14  14  13  12  10  8
20 FT wind gust.10  13  16  18  18  18  17  14  13  10
Ridge wind dir..E   E   E   E   E   E   E   E   E   E
Ridge wind spd..15  20  20  25  25  25  25  20  20  15
Mix hgt (kft)...1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Transp wind dir.E   E   E   E   E   E   E   E   E   SE
Transp wind spd.14  20  22  24  24  24  24  22  18  15
SDspl kt-ft/100014  20  23  25  25  25  25  23  19  15

.TUESDAY...

Sky/weather.........Sunny (5-15 percent). A few cumulus over
                    the higher peaks of the Bighorn Mountains
                    to the east of the fire.
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....90 to 93.
Min humidity........Around 10 percent.
Wind (20 ft)........East wind 6 to 9 mph until 0900L, then
                    becoming west 7 to 11 mph by 1100L.
Ridgetop wind.......East around 10 mph until 0900L, then switching
                    to the west-southwest 9 to 13 mph by 1100L.
Mixing height.......Less than 1500 ft AGL until 0900L, then
                    gradually increasing to 11000 ft AGL by 1500L.
Transport winds.....East around 10 mph until 0900L, then becoming
                    southwest 10 to 15 mph by 1200L
Smoke dispersal.....Poor until 0900L, then slowly increasing to
                    Very Good by 1400L.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........5   5   5   5   5   5   5   5   10  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............69  72  75  78  81  83  86  88  90  91  91  90
RH..............33  30  28  26  23  20  17  15  13  12  11  11
20 FT wind dir..E   E   E   S   SW  SW  W   W   W   W   SW  SW
20 FT wind spd..6   6   4   3   4   5   6   6   6   4   6   6
20 FT wind gust.8   7   6   4   6   6   8   10  10  6   10  8
Ridge wind dir..E   E   E   S   SW  SW  W   W   W   W   SW  SW
Ridge wind spd..15  10  10  10  10  10  10  15  10  10  15  10
Mix hgt (kft)...1.0 1.0 1.0 3.0 5.5 8.0 12  13  14  14  14  14
Transp wind dir.SE  SE  SE  S   SW  SW  SW  SW  SW  SW  SW  SW
Transp wind spd.13  12  9   8   9   10  12  13  12  9   13  12
SDspl kt-ft/100012  11  10  21  45  74  116 137 134 111 153 134

.TUESDAY NIGHT...

Sky/weather.........Mostly clear (5-15 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....67 to 70.
Max humidity........31 to 34 percent.
Wind (20 ft)........West-southwest wind 7 to 10 mph until 2000L,
                    then becoming east 9 to 13 with occasional gusts
                    around 19 mph by 2200L. Speeds decreasing to
                    7 to 10 mph after 0100L.
Ridgetop wind.......West-southwest around 10 mph until 2000L,
                    then becoming east 10 to 15 mph by 2200L.
Mixing height.......Around 9000 ft AGL until 1900L, then decreasing
                    to less than 1500 ft AGL by 2100L.
Transport winds.....Southwest 10 to 15 mph until 1900L, then
                    becoming east 10 to 15 mph by 2100L. East wind
                    decreases to around 10 mph by 0300L.
Smoke dispersal.....Very Good until 1900L, then decreasing to
                    Poor by 2200L.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........5   5   10  10  10  10  5   10  10  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............90  88  83  79  78  77  76  75  75  74  73  72
RH..............10  12  14  15  17  19  22  24  26  28  29  30
20 FT wind dir..SW  S   SE  E   E   E   E   E   SE  SE  SE  E
20 FT wind spd..6   6   8   11  13  15  15  15  14  12  10  9
20 FT wind gust.10  10  11  14  18  18  19  18  17  14  13  10
Ridge wind dir..SW  S   SE  E   E   E   E   E   SE  SE  SE  E
Ridge wind spd..10  10  15  20  20  25  25  25  20  20  15  15
Mix hgt (kft)...12  2.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Transp wind dir.SW  S   E   E   SE  SE  SE  SE  SE  SE  SE  S
Transp wind spd.12  12  15  18  21  23  23  23  22  20  17  16
SDspl kt-ft/1000119 25  16  19  22  24  24  24  23  20  18  16

.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...
Mostly clear in the morning and early afternoon. Isolated
high-based (mostly dry) showers and perhaps a thunderstorm
between 1700L and 2000L. Hot with highs in the mid 90s.
Lows in the upper 60s. Typical diurnal upslope/downslope
wind pattern with speeds 7 to 10 mph.
.THURSDAY...
Partly cloudy with isolated, mainly high-based, showers and
thunderstorms late in the day. Highs in the upper 80s. Lows in
the upper 60s. West-northwest wind 5 to 10 mph.
.FRIDAY...
Mostly clear into the afternoon, then increasing clouds with
a slight chance of late afternoon and evening showers and
thunderstorms. Highs around 80. Lows in the lower 60s.
Southeast wind 5 to 10 mph.
.SATURDAY...
Mostly clear. Highs in the lower 80s. Lows around 60. East
wind 5 to 10 mph.

$$
Forecaster...CNJ
Requested by...Travis Pardue
Type of request...WILDFIRE
.TAG 2519957.4/RIW
.DELDT 08/18/25
.FormatterVersion 2.0.0
.EMAIL travis_pardue@firenet.gov