Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
478
FNUS75 KRIW 140113
FWSRIW
Spot Forecast for Pumpkin Creek WF...USFWS
National Weather Service Riverton WY
713 PM MDT Wed Aug 13 2025
Forecast is based on forecast start time of 1900 MDT on August 13.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Isolated to scattered showers and a few thunderstorms continue to
travel east across the north half of Wyoming Wednesday evening. A
few of these may track across the fire site, with the best chance
coming between 2000L and 2200L. Gusty and erratic outflow wind of
30 to 40 mph has been occurring with these showers and storms
Wednesday evening. Thursday will again provide the chance for
some late day and early evening showers and thunderstorms. Gusty
outflow wind would again be the primary hazard. Surface wind does
switch to the north and blow 10 to 15 mph from late Thursday
morning into the early afternoon.
...Thunderstorms imply strong gusty and erratic winds...
.REST OF TONIGHT...
Sky/weather.........Partly cloudy (30-40 percent) with isolated
showers until 2300L. Becoming mostly clear late.
CWR.................0 percent.
Chance of pcpn......20 percent until 2300L, then 10 percent or less.
Chance of thunder...5 percent.
Min temperature.....60 to 63.
Max humidity........57 to 60 percent.
Wind (20 ft)........North to northeast wind 7 to 11 mph until 2100L,
then becoming southwest 6 to 9 mph by 2300L.
Gusty and erratic wind gusts 30 to 40 mph
possible with any showers, even those that
produce little if any rain.
Ridgetop wind.......North 10 to 15 mph until 2100L, then becoming
south to southwest around 10 mph by 2300L.
Mixing height.......Decreasing to less than 1000 ft AGL between
2100L and 2300L, then persisting through
the night.
Transport winds.....North around 12 mph until 2100L, then
becoming south to southwest around 10 mph
by 2300L.
Smoke dispersal.....Fair until 2000L, then becoming Poor by 2300L.
TIME (MDT) 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........50 45 40 35 35 30 30 20 20 15 15
Weather cov.....SCH SCH SCH SCH
Weather type....RW RW RW RW
Tstm cov........ISO ISO ISO ISO
CWR.............0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).20 20 10 10 0 0 0 0 0 0 0
Chc of thdr (%).10 10 10 10 0 0 0 0 0 0 0
Temp............85 80 76 74 72 70 68 67 65 64 63
RH..............26 30 34 37 41 44 46 48 50 53 55
20 FT wind dir..NW SW S S S S S S S S S
20 FT wind spd..7 6 5 5 5 6 6 6 6 6 7
20 FT wind gust.12 10 8 7 8 10 10 10 10 10 10
Ridge wind dir..N E S S S S S S S S S
Ridge wind spd..15 10 10 10 10 10 10 10 15 15 15
Mix hgt (kft)...3.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.NW N E SE S S S S S S S
Transp wind spd.13 12 10 12 10 12 12 12 13 13 13
SDspl kt-ft/100041 7 5 5 5 5 5 5 5 5 5
.THURSDAY...
Sky/weather.........Sunny (10-20 percent) until 1400L, then
becoming partly cloudy (30-40 percent) with
isolated showers and thunderstorms by 1600L.
CWR.................0 percent.
Chance of pcpn......0 percent until 1500L, then 15 percent.
Chance of thunder...5 percent after 1600L.
Max temperature.....91 to 94.
Min humidity........16 to 19 percent.
Wind (20 ft)........South-southwest 6 to 9 mph until 0700L, then
becoming north 9 to 14 mph with occasional
gusts to 18 mph between 0800L and 0900L.
North wind decreasing to around 10 mph between
1200L and 1400L.
Ridgetop wind.......Southwest around 10 mph until 0800L, then
becoming north 11 to 16 mph by 0900L.
Mixing height.......Less than 1000 ft AGL until 0800L, then
gradually increasing to around 11000 ft AGL by
1400.
Transport winds.....South around 10 mph until 0800L, then
becoming north 12 to 16 mph by 0900L.
Smoke dispersal.....Poor until 0900L, then gradually increasing
to Very Good by 1400L.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........10 10 15 10 10 10 10 5 5 10 10 25
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............63 65 69 74 79 82 85 87 89 89 92 91
RH..............58 60 49 40 33 29 26 22 21 19 18 18
20 FT wind dir..S S SW NW N N N N N N N N
20 FT wind spd..7 6 6 6 9 8 6 6 5 6 6 6
20 FT wind gust.11 10 7 10 13 12 10 8 7 8 8 10
Ridge wind dir..S S SW NW N N N N N N N N
Ridge wind spd..15 15 10 15 15 15 15 10 10 10 10 15
Mix hgt (kft)...0.5 0.5 0.5 1.5 2.0 3.0 4.0 5.5 9.0 11 12 12
Transp wind dir.S SW W N N N NW NW W W W W
Transp wind spd.14 13 12 13 16 15 13 12 14 14 14 13
SDspl kt-ft/10004 5 6 17 31 37 45 54 106 134 144 127
.THURSDAY NIGHT...
Sky/weather.........Mostly cloudy (50-60 percent) with isolated
showers and thunderstorms until 2100L. Then,
becoming partly cloudy (30-40 percent)
by 2300L.
CWR.................0 percent.
Chance of pcpn......20 percent until 2100L, then becoming less
than 10 percent by 2300L.
Chance of thunder...15 percent.
Min temperature.....60 to 63.
Max humidity........58 to 61 percent.
Wind (20 ft)........Northwest wind around 7 mph until 1900L, then
becoming southerly 6 to 9 mph by 2200L. Gusty
and erratic wind expected near showers and
thunderstorms in the evening. However, the
strongest gusts are likely to come from the
west or southwest.
Ridgetop wind.......Northwest around 8 to 12 mph until 1900L, then
becoming southerly 10 to 15 mph by 2000L. Wind
decreasing to 6 to 9 mph between 2200L and
2400L midnight.
Mixing height.......10000 ft AGL until 1900L, then gradually
decreasing to less than 1000 ft AGL by 2300L.
Transport winds.....Northwest around 10 mph until 1900L, then
becoming south to southwest 11 to 16 mph.
Smoke dispersal.....Very Good until 1900L, then becoming
gradually becoming Poor by 2300L.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........35 80 80 80 75 60 40 40 35 30 35 35
Weather cov.....SCH SCH SCH
Weather type....RW RW RW
Tstm cov........SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).10 10 10 10 10 10 0 0 0 0 0 0
Chc of thdr (%).10 10 10 10 10 10 0 0 0 0 0 0
Temp............90 86 82 78 75 73 71 69 67 65 63 62
RH..............18 22 27 31 37 41 43 46 49 52 55 58
20 FT wind dir..NW W S E E SE S S S S S S
20 FT wind spd..7 6 6 6 6 6 6 6 5 5 5 6
20 FT wind gust.13 11 11 11 10 10 10 10 10 10 10 10
Ridge wind dir..NW W S E E SE S S S S S S
Ridge wind spd..15 15 10 10 10 10 10 10 10 10 10 10
Mix hgt (kft)...10 2.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.SW SW S S S S S S S S S S
Transp wind spd.14 14 16 15 20 16 13 13 12 12 12 13
SDspl kt-ft/1000119 33 17 7 12 9 6 5 4 4 4 4
.FRIDAY...
Sky/weather.........Mostly sunny (25-35 percent). Isolated showers
and thunderstorms after 1700L.
CWR.................0 percent.
Chance of pcpn......10 percent after 1700L.
Chance of thunder...10 percent after 1700L.
Max temperature.....Around 92.
Min humidity........16 to 19 percent.
Wind (20 ft)........South-southwest wind 6 to 9 mph until 1000L,
then becoming north to northeast 7 to 11 mph.
Ridgetop wind.......Southwest around 10 mph until 1000L, then
becoming north to northeast.
Mixing height.......1000 ft AGL until 0800L, then gradually
increasing to around 10000 ft AGL by 1400L.
Transport winds.....Southwest around 10 mph until 1000L, then
becoming northerly by 1200L.
Smoke dispersal.....Poor until 1000L, then gradually increasing
to Very Good by 1400L.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........40 35 25 20 20 20 20 20 20 20 35 35
Weather cov..... SCH
Weather type.... RW
Tstm cov........ SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 10 10 10 10 10 10
Chc of thdr (%).0 0 0 0 0 0 10 10 10 10 10 10
Temp............62 65 69 73 77 81 84 86 88 89 90 90
RH..............58 54 48 41 36 31 27 23 21 19 18 17
20 FT wind dir..S SW SW SW W N N N N N N N
20 FT wind spd..6 6 6 6 6 6 6 6 6 6 6 6
20 FT wind gust.10 10 10 10 10 10 10 11 11 12 12 11
Ridge wind dir..S SW SW SW W N N N N N N N
Ridge wind spd..10 10 10 10 10 10 10 10 10 10 10 15
Mix hgt (kft)...0.5 0.5 1.0 1.0 2.5 4.5 6.0 7.5 9.0 11 10 9.0
Transp wind dir.S SW SW SW W W W W W W W NW
Transp wind spd.13 13 12 12 12 13 13 13 12 12 12 13
SDspl kt-ft/10004 7 8 11 27 49 67 84 92 107 100 102
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY NIGHT...
A few showers and thunderstorms early, otherwise partly cloudy.
Lows in the lower 60s. South wind around 10 mph.
.SATURDAY...
Partly cloudy with a slight chance of afternoon and early
evening showers and thunderstorms. Highs in the lower 90s.
Lows in the lower 60s. South wind around 10 mph.
.SUNDAY...
Partly cloudy. Slight chance of showers and thunderstorms. Highs
in the upper 80s. Lows around 60. South wind around 10 mph.
.MONDAY...
Mostly clear. Highs in the lower 90s. Lows in the upper 50s.
Light wind.
$$
Forecaster...CNJ
Requested by...Eric Mark
Type of request...WILDFIRE
.TAG 2519861.0/RIW
.DELDT 08/13/25
.FormatterVersion 2.0.0
.EMAIL eric_mark@fws.gov