Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
646
FNUS75 KRIW 022030
FWSRIW
Spot Forecast for KING SAR...NPS YNP
National Weather Service Riverton WY
230 PM MDT Tue Sep 2 2025
Forecast is based on forecast start time of 0600 MDT on September 03.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...Wednesday will again be warm and dry with clouds
developing in the afternoon. Breezy and gusty northwest winds are
expected from late morning through early evening. Wednesday night
will be mild under mostly clear skies and lighter winds. Thursday
will start out the same, though by noon, a cool front will move
north to south through the area, bringing gusty (20-30 mph) north
winds and cooler temperatures. There will be increasing clouds in
the afternoon Thursday with a small (10 percent) chance of showers
and an isolated thunderstorm, but best guess is that they will
stay to the east of the SAR area. Northeast, then east winds will
develop Thursday night. Clouds will increase over the area late
Friday, with the best chance of precipitation late Saturday.
...Thunderstorms imply strong gusty and erratic winds...
.WEDNESDAY...
Sky/weather.........Mostly sunny (10-20 percent). Patchy smoke early
in the morning.
Chance of pcpn......Less than 5 percent.
Chance of thunder...Less than 5 percent.
Max temperature.....65-68.
Min humidity........22-25 percent.
Min apparent temp...34 in the early morning.
Surface winds (mph).Light west-southwest winds until 1000, then
northwest 10 to 15 mph with gusts to around
20 mph.
Wind (20 ft)........West-northwest winds 6 to 10 mph until 1000,
then northwest 12 to 18 mph with gusts to
20-25 mph.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........20 15 10 5 10 15 25 25 30 45 40 35
Weather cov.....PTY PTY PTY
Weather type....SMK SMK SMK
Tstm cov........
Chc of pcpn (%).0 0 0 0 0 0 10 10 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 10 10 0 0 0 0
Temp............39 39 44 52 58 60 62 64 66 67 67 66
RH..............74 73 59 46 38 32 29 29 26 25 24 23
Wind chill (F)..M M M M M M M M M M M M
20 FT wind dir..NW NW W W W NW NW NW NW NW NW NW
20 FT wind spd..6 6 6 6 6 7 9 10 11 12 12 11
20 FT wind gust.8 8 8 8 10 11 13 14 17 18 18 18
Surface wnd dir.NW NW W W W NW NW NW NW NW NW NW
Surface wnd spd.8 8 8 8 8 9 11 13 14 15 15 14
Surface wnd gst.10 10 10 10 12 14 16 18 21 23 23 22
.WEDNESDAY NIGHT...
Sky/weather.........Partly cloudy (25-35 percent) until 2400, then
mostly clear (10-20 percent).
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 40.
Max humidity........65 percent.
Min apparent temp...37.
Surface winds (mph).Northwest winds 8 to 12 mph with gusts to
around 18 mph until 2000. Light north-
northwest winds around 6 mph after 2000.
Wind (20 ft)........Northwest winds 10 to 15 mph with gusts to
around 20 mph until 2100. Light north-northwest
winds around 8 mph after 2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........40 35 35 35 30 30 25 25 25 20 20 15
Weather cov.....
Weather type....
Tstm cov........
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 57 52 51 50 48 46 44 43 42 41
RH..............25 29 36 42 45 47 50 52 56 59 62 63
Wind chill (F)..M M M M M M M M M M M M
20 FT wind dir..NW NW NW NW NW W W W W W W W
20 FT wind spd..11 9 7 6 6 5 5 5 5 5 5 5
20 FT wind gust.17 14 11 10 8 7 7 7 7 7 7 7
Surface wnd dir.NW NW NW NW NW W W W W W W W
Surface wnd spd.14 11 9 8 8 6 6 6 6 6 6 6
Surface wnd gst.21 17 14 12 10 9 9 9 9 9 9 9
.THURSDAY...
Sky/weather.........Mostly sunny (15-25 percent) until 1200, then
partly cloudy (40-50 percent).
Chance of pcpn......10 percent after 1500.
Chance of thunder...5 percent after 1500.
Max temperature.....Around 62-65.
Min humidity........25 percent.
Min apparent temp...38 early in the morning.
Surface winds (mph).Light west winds until 0900, then northwest
9 to 13 mph with gusts to around 20 mph,
becoming more northerly in the afternoon
with gusts up to 30 mph.
Wind (20 ft)........West winds 6 to 8 mph until 0900, then
northwest 10 to 15 mph with gusts to around
20 mph, then north winds 15 to 20 mph with
gusts over 25 mph in the afternoon.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........15 10 10 5 10 10 25 25 25 25 25 30
Weather cov.....
Weather type....
Tstm cov........
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............42 45 50 55 59 62 64 65 65 65 64 63
RH..............61 55 47 39 33 28 26 25 26 26 28 30
Wind chill (F)..M M M M M M M M M M M M
20 FT wind dir..W W W W NW NW NW NW NW NW NW N
20 FT wind spd..6 6 6 7 7 8 9 10 11 12 12 11
20 FT wind gust.8 8 10 10 12 13 14 16 17 18 18 18
Surface wnd dir.W W W W NW NW NW NW NW NW NW N
Surface wnd spd.8 8 8 9 9 10 11 13 14 15 15 14
Surface wnd gst.10 10 12 13 15 16 17 20 21 22 22 22
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...
Mostly clear. Lows in the mid 30s. Highs in the lower 60s.
Northeast winds around 8 mph.
.SATURDAY...
Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the upper 30s. Highs in the lower 60s.
West winds around 8 mph.
.SUNDAY...
Mostly cloudy with showers likely and chance of thunderstorms.
Lows in the upper 30s. Highs in the mid 50s. Southwest winds
around 8 mph.
$$
Forecaster...McDonald
Requested by...Todd Opperman
Type of request...SAR
.TAG 2521122.0/RIW
.DELDT 09/02/25
.FormatterVersion 2.0.0
.EMAIL wildfire.opperman@gmail.com