Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
575
FNUS75 KRIW 131708
FWSRIW
Spot Forecast for BIG SPRING...WASHAKIE COUNTY
National Weather Service Riverton WY
1108 AM MDT Wed Aug 13 2025
Forecast is based on forecast start time of 1100 MDT on August 13.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
West winds will begin to increase shortly and continue through
the afternoon gusting 15 to 20 mph. Humidity levels will fall to
around 20 percent through the afternoon. A few showers and
thunderstorms are expected during the afternoon, which may produce
briefly gusty winds as they move east.
Conditions Thursday will be similar to today, with low humidity
and a chance for showers during the afternoon. Winds will be from
the west again, but are currently expected to be lighter, with
most gusts remaining around 10 mph.
...Thunderstorms imply strong gusty and erratic winds...
.REST OF TODAY...
Sky/weather.........Sunny (20-30 percent) then partly cloudy (45-55
percent) after 1400. Slight chance of showers
and thunderstorms late in the afternoon.
CWR.................0 percent.
Chance of pcpn......30 percent.
Chance of thunder...17 percent.
Max temperature.....Around 84.
Min humidity........16 percent.
Wind (20 ft)........Light winds until 1200, then west 8 to 12 mph.
Gusts up to 21 mph. Gusty and erratic winds
expected near thunderstorms late in the
afternoon.
Ridgetop wind.......West 15 to 20 mph.
Mixing height.......7000 ft AGL until 1300, then 11500 ft AGL.
Transport winds.....West 13 to 21 mph until 1400, then 20 to 24
mph.
Smoke dispersal.....Fair until 1200, then excellent.
TIME (MDT) 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........10 10 15 15 30 25 35
Weather cov..... SCH SCH SCH
Weather type.... RW RW RW
Tstm cov........ SCH SCH SCH
CWR.............0 0 0 0 0 0 0
Chc of pcpn (%).0 10 10 10 10 20 20
Chc of thdr (%).0 0 10 10 10 20 20
Temp............77 80 82 83 83 83 82
RH..............30 27 24 21 19 19 20
20 FT wind dir..SW W W W W SW SW
20 FT wind spd..6 8 9 12 11 11 10
20 FT wind gust.10 12 13 17 16 16 14
Ridge wind dir..SW W W W W SW SW
Ridge wind spd..15 15 15 20 20 20 15
Mix hgt (kft)...5.5 7.0 10 12 11 12 10
Transp wind dir.W W W W W W W
Transp wind spd.13 15 21 24 24 23 20
SDspl kt-ft/100058 94 184 237 227 228 172
.TONIGHT...
Sky/weather.........Partly cloudy (25-35 percent) then becoming
clear (0-10 percent). Slight chance of showers
and thunderstorms early in the evening.
CWR.................0 percent.
Chance of pcpn......20 percent.
Chance of thunder...11 percent.
Min temperature.....Around 62.
Max humidity........41 percent.
Wind (20 ft)........West winds around 9 mph until 1900, then
light and variable. Gusty and erratic winds
expected near thunderstorms early in the
evening.
Ridgetop wind.......West around 15 mph until 1900, then southeast
until 2100, then east.
Mixing height.......9000 ft AGL until 1900. 1000 ft AGL after 2000.
Transport winds.....West 15 to 20 mph until 2300, then east 14 to
17 mph until 0200, then southeast 13 to 15 mph.
Smoke dispersal.....Excellent until 1900. Poor after 2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........45 45 40 40 35 30 20 20 15 5 5 5
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 (%).20 20 10 10 10 0 0 0 0 0 0 0
Chc of thdr (%).10 10 10 10 10 0 0 0 0 0 0 0
Temp............81 79 77 74 71 70 69 68 67 66 65 63
RH..............23 23 24 25 28 31 33 35 35 37 38 39
20 FT wind dir..W S SE E N NE NE N E E E E
20 FT wind spd..9 8 9 9 9 10 7 7 7 8 7 6
20 FT wind gust.13 12 13 13 13 14 10 10 10 12 10 10
Ridge wind dir..W S SE E N NE NE N E E E E
Ridge wind spd..15 15 15 15 15 15 15 15 15 15 15 15
Mix hgt (kft)...9.0 5.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Transp wind dir.W W SW W W E NE E S SE SE E
Transp wind spd.20 15 16 16 16 17 14 14 14 15 14 13
SDspl kt-ft/1000152 73 14 14 14 15 12 12 11 12 12 10
.THURSDAY...
Sky/weather.........Sunny (15-25 percent) then becoming partly
sunny (60-70 percent). Slight chance of showers
and thunderstorms late in the afternoon.
CWR.................0 percent.
Chance of pcpn......20 percent.
Chance of thunder...16 percent.
Max temperature.....Around 86.
Min humidity........15 percent.
Wind (20 ft)........Light winds until 1200, then west 8 to 9 mph.
Gusty and erratic winds expected near
thunderstorms late in the afternoon.
Ridgetop wind.......East 10 to 15 mph until 0900, then west.
Mixing height.......2500 ft AGL until 1000, then 11500 ft.
Transport winds.....West 10 to 17 mph until 1300, then 15 to 21 mph.
Smoke dispersal.....Poor until 1100, then excellent.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........10 10 10 10 15 5 10 10 20 20 30 65
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 0 0 10 10 10 20
Chc of thdr (%).0 0 0 0 0 0 0 0 10 10 10 20
Temp............63 65 69 73 75 78 79 82 83 84 85 83
RH..............40 41 38 35 31 28 23 20 17 15 16 17
20 FT wind dir..E E SE SW SW SW W W W W W W
20 FT wind spd..6 6 4 5 6 6 8 9 8 8 8 8
20 FT wind gust.10 7 6 6 10 10 12 13 12 12 12 12
Ridge wind dir..E E SE SW SW SW W W W W W W
Ridge wind spd..15 10 10 10 15 15 15 15 15 15 15 15
Mix hgt (kft)...1.0 1.0 1.5 2.5 3.0 5.5 7.5 9.0 11 12 11 8.5
Transp wind dir.E E S W W W W W W W W W
Transp wind spd.13 12 9 10 13 13 17 21 21 18 17 15
SDspl kt-ft/100011 10 10 22 35 58 112 164 190 184 168 109
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...
Partly cloudy. Lows in the lower 60s. Highs in the mid 80s. South
winds around 7 mph.
.SATURDAY...
Partly cloudy. Lows in the lower 60s. Highs in the lower 80s.
Southeast winds around 7 mph.
.SUNDAY...
Partly cloudy. Slight chance of showers and thunderstorms. Lows
in the lower 60s. Highs in the mid 80s. Light winds.
$$
Forecaster...Straub
Requested by...DARIA LOMASNEY
Type of request...WILDFIRE
.TAG 2519815.1/RIW
.DELDT 08/13/25
.FormatterVersion 2.0.0
.EMAIL sgettings@blm.gov,WYCDC@FIRENET.GOV