Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
183
FNUS75 KRIW 092048
FWSRIW
Spot Forecast for Trail Creek...Yellowstone National Park
National Weather Service Riverton WY
248 PM MDT Wed Jul 9 2025
Forecast is based on forecast start time of 1500 MDT on July 09.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Maximum temperature and lowest RH of the day should occur between
1500 and 1600 this afternoon, at which point temperatures will
slowly decrease through the rest of the afternoon and evening.
Winds will be strongest (80 to 10 mph with gusts to around 15 mph)
through 1700 this afternoon from the west. Winds will gradually
decrease through the evening, becoming light (less than 5 mph) and
downslope/downvalley by 2100. Overnight, expect light downslope/
downvalley winds and partly cloudy skies through the night.
Minimum temperature should bottom out in the mid to upper 40s with
RHs recovering to around 40 to 45 percent.
There is a slight chance of rain showers around 0600 to 0800
Thursday morning, but chances generally remain less than 10
percent and there is a 0% chance of wetting rain. Mostly cloudy
skies Thursday should allow temperatures to be a 3 to 5 degrees
cooler than today, with min RHs staying above 25 percent. Showers
and thunderstorms will be possible (20 percent chance) Thursday
late afternoon, generally after 1500.
...Thunderstorms imply strong gusty and erratic winds...
.REST OF TODAY...
Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....79 to 81 degrees.
Min humidity........9 to 11 percent.
Wind (20 ft)........West winds 8 to 10 mph with gusts to around 15
mph.
Ridgetop wind.......West around 18 mph.
Mixing height.......13500 ft AGL.
Transport winds.....West around 25 mph.
Smoke dispersal.....Excellent.
TIME (MDT) 3PM 4PM 5PM
Sky (%).........10 10 15
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0
Chc of pcpn (%).0 0 0
Chc of thdr (%).0 0 0
Temp............79 77 76
RH..............11 13 15
20 FT wind dir..W W W
20 FT wind spd..12 11 11
20 FT wind gust.18 17 18
Ridge wind dir..W W W
Ridge wind spd..20 20 20
Mix hgt (kft)...14 14 13
Transp wind dir.W W W
Transp wind spd.25 25 25
SDspl kt-ft/1000294 293 274
.TONIGHT...
Sky/weather.........Mostly clear (20-30 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...5 percent.
Min temperature.....46 to 50 degrees.
Max humidity........40 to 45 percent.
Wind (20 ft)........West winds 7 to 11 mph with gusts to around 15
mph until 2000, then light.
Ridgetop wind.......West 15 to 20 mph until 2000, then around 10
mph until 2100, then becoming light around 5
to 10 mph.
Mixing height.......11500 ft AGL until 1900. 1000 ft AGL after
2000.
Transport winds.....West 18 to 22 mph until 2000, then west-northwest
at around 10 mph.
Smoke dispersal.....Excellent until 1900. Poor after 2100.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........15 15 15 15 20 25 30 30 35 35 35 35
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 10 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0 10 0 0
Temp............75 71 67 63 61 59 57 56 56 55 54 53
RH..............17 21 25 28 31 33 36 39 43 46 46 46
20 FT wind dir..W W W W SW W N E SE N NE S
20 FT wind spd..11 7 5 2 4 3 3 4 3 3 1 5
20 FT wind gust.15 10 6 6 5 4 5 4 4 6
Ridge wind dir..W W W W SW W N E SE N NE S
Ridge wind spd..20 15 10 5 10 10 10 10 10 10 5 10
Mix hgt (kft)...12 8.0 2.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Transp wind dir.W W W NW N N N NE NE NE NE W
Transp wind spd.22 18 10 7 9 8 8 9 8 8 9 10
SDspl kt-ft/1000216 125 20 7 9 7 7 8 7 7 9 10
.THURSDAY...
Sky/weather.........Sunny (15-25 percent). Slight chance of showers
and thunderstorms late in the afternoon.
CWR.................0 percent.
Chance of pcpn......20 percent.
Chance of thunder...19 percent.
Max temperature.....Around 75.
Min humidity........30 percent.
Wind (20 ft)........Light winds until 1200, then west 8 to 10 mph
with gusts to around 16 mph. Gusty and erratic
winds possible near thunderstorms late in the
afternoon.
Ridgetop wind.......East around 10 mph until 0700, then light until
0800, then south around 10 mph until 0900, then
west.
Mixing height.......1500 ft AGL until 0900. 9000 ft AGL after 1200.
Transport winds.....Southeast 7 to 10 mph until 1000, then west 13
to 17 mph.
Smoke dispersal.....Poor until 0900. Very good after 1200.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........30 25 20 15 15 10 10 10 15 15 25 30
Weather cov..... SCH SCH
Weather type.... RW RW
Tstm cov........ SCH 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............52 55 58 61 63 65 68 69 70 71 71 71
RH..............46 45 44 42 40 38 36 34 32 30 31 31
20 FT wind dir..E SE S W W W W W W W W W
20 FT wind spd..4 2 3 5 6 6 8 9 9 10 10 9
20 FT wind gust.6 4 7 10 10 12 13 14 16 16 14
Ridge wind dir..E SE S W W W W W W W W W
Ridge wind spd..10 5 10 10 15 15 15 15 15 15 15 15
Mix hgt (kft)...1.0 1.0 1.5 3.0 5.0 6.5 7.5 8.5 8.5 9.0 9.0 8.5
Transp wind dir.SE SE E S W W W W W W W W
Transp wind spd.9 7 8 10 13 13 15 16 16 17 17 16
SDspl kt-ft/10009 7 11 28 56 73 100 118 121 138 135 121
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...
Partly cloudy. Chance of showers and thunderstorms. Lows in the
upper 40s. Highs in the upper 60s. Light winds.
.SATURDAY...
Partly cloudy. Lows in the mid 40s. Highs in the mid 70s. Light
winds.
.SUNDAY...
Mostly clear. Lows around 50. Highs around 80. Light winds.
$$
Forecaster...Hensley
Requested by...Laura Dooley
Type of request...WILDFIRE
.TAG 2517681.0/RIW
.DELDT 07/09/25
.FormatterVersion 2.0.0
.EMAIL laura_dooley@nps.gov