253
FNUS75 KRIW 241052
FWSRIW

Spot Forecast for Escarpment...Yellowstone National Park
National Weather Service Riverton WY
452 AM MDT Sun Aug 24 2025

Forecast is based on forecast start time of 0600 MDT on August 24.
If conditions become unrepresentative, contact the National Weather
Service

.DISCUSSION...

Light south-southeast winds 5 to 7 mph in the morning. Winds shift
to be from the west around 1000L or 1100L. Winds increase around
1200L, with speeds 10 to 12 mph and gusts 15 to 20 mph through the
afternoon. Winds decrease and shift to be from the east between
1900L and 2100L. Winds Sunday night will be around 6 mph, with
occasional higher winds around 10 mph. There is a slight chance (15%
to 20%) for a shower or storm this afternoon and evening, between
1400L and 2300L, with peak chances between 1600L and 2200L. Though
moisture increases some today, any showers and storms today will be
not provide much wetting rain chances, with chance of wetting rain
remaining negligible. Looking ahead, increasing moisture through this
week brings daily shower and thunderstorm chances. Chances of a
wetting rain also increases, especially for Wednesday/Thursday.

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

.TODAY...

Sky/weather.........Mostly sunny (35-45 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...8 percent.
Max temperature.....Around 75.
Min humidity........22 to 25 percent.
Wind (20 ft)........Light winds until 1200, then wwest-northwest
10 to 12 mph with gusts to around 15 to 20 mph.
Ridgetop wind.......South around 10 mph until 0900, then becoming
southwest around 10 mph until 1200, then northwest
                    through the rest of the afternoon.
Mixing height.......2000 ft AGL until 1000 increasing through the late
morning, becoming 11500 ft AGL after 1400.
Transport winds.....Southeast 7 to 8 mph until 1000, then west 8 to
                    13 mph until 1200, then northwest 17 to 20 mph.
Smoke dispersal.....Poor until 1000. Very good after 1000 increasing
to excellent in the afternoon after 1200.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........25  25  25  25  30  30  35  40  45  50  50  55
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   10  10  10  10  10  10  10
Chc of thdr (%).0   0   0   0   0   0   10  10  10  10  10  10
Temp............49  49  55  62  65  70  73  75  75  75  74  74
RH..............58  56  53  43  38  33  28  26  26  24  24  24
20 FT wind dir..S   S   S   SE  S   W   W   NW  NW  NW  NW  NW
20 FT wind spd..3   3   3   2   3   5   7   8   9   10  10  9
20 FT wind gust.                    7   11  13  14  16  16  14
Ridge wind dir..S   S   S   SE  S   W   W   NW  NW  NW  NW  NW
Ridge wind spd..10  10  10  5   10  10  15  15  15  15  15  15
Mix hgt (kft)...1.5 1.5 1.5 2.0 4.0 6.5 9.0 11  11  12  12  11
Transp wind dir.SE  SE  SE  S   SW  W   W   W   W   W   NW  NW
Transp wind spd.8   8   8   7   8   13  18  20  18  18  18  17
SDspl kt-ft/100011  11  11  13  27  73  143 175 176 183 183 165

.TONIGHT...

Sky/weather.........Mostly cloudy (55-65 percent) with occasional
breaks in the clouds.
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...5 percent.
Min temperature.....Around 46.
Max humidity........64 percent.
Wind (20 ft)........North winds around 7 mph until 1900, then
                    light.
Ridgetop wind.......North 10 to 15 mph until 2100, then east until
                    0500, then light.
Mixing height.......9500 ft AGL until 1900. 1500 ft AGL after 2000.
Transport winds.....North 12 to 16 mph until 2000, then east 7 to
                    12 mph.
Smoke dispersal.....Very good until 1900. Poor after 2000.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........55  55  65  50  60  60  60  55  50  45  45  45
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of pcpn (%).10  10  10  0   0   0   0   0   0   0   0   0
Chc of thdr (%).10  10  10  0   0   0   0   0   0   0   0   0
Temp............72  68  62  58  56  55  53  52  51  51  50  49
RH..............24  29  37  42  45  47  52  54  57  57  56  59
20 FT wind dir..N   N   NE  E   E   E   E   E   E   E   E   E
20 FT wind spd..7   6   6   6   6   5   5   4   4   3   3   2
20 FT wind gust.11  8   8   8   8   7   7   6   6
Ridge wind dir..N   N   NE  E   E   E   E   E   E   E   E   E
Ridge wind spd..15  10  10  10  10  10  10  10  10  10  10  5
Mix hgt (kft)...9.5 3.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5
Transp wind dir.N   N   E   E   E   E   E   E   SE  SE  SE  SE
Transp wind spd.16  12  12  12  12  10  10  9   9   8   8   7
SDspl kt-ft/1000133 37  17  16  16  15  15  13  13  11  11  10

.MONDAY...

Sky/weather.........Mostly sunny (45-55 percent) then becoming
                    mostly cloudy (65-75 percent). Chance of rain
                    showers and slight chance of thunderstorms in
                    the afternoon.
CWR.................2 percent.
Chance of pcpn......30 percent.
Chance of thunder...23 percent.
Max temperature.....Around 79.
Min humidity........21 to 24 percent.
Wind (20 ft)........Light winds. Gusty and erratic winds expected
                    near thunderstorms in the afternoon.
Ridgetop wind.......Light winds until 1200, then northwest around
                    10 mph until 1600, then northeast.
Mixing height.......2500 ft AGL until 1000, increasing through the
morning until 1200, then 8500 ft AGL until 1700,
then 6500 ft AGL.
Transport winds.....Southeast around 7 mph until 1000, then
                    southwest until 1200, then turning gradually
to the north then east between 1500 and 1700.
Smoke dispersal.....Poor until 1000. Good after 1400.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........40  50  30  35  40  45  50  55  60  65  65  70
Weather cov.....                        CHC CHC CHC CHC CHC CHC
Weather type....                        RW  RW  RW  RW  RW  RW
Tstm cov........                        SCH SCH SCH SCH SCH SCH
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of pcpn (%).0   0   0   0   0   0   30  30  30  30  30  30
Chc of thdr (%).0   0   0   0   0   0   20  20  20  20  20  20
Temp............48  46  53  62  68  73  77  78  79  79  78  77
RH..............58  64  54  41  37  32  26  23  23  23  23  24
20 FT wind dir..SE  SE  SE  SE  S   W   W   NW  NW  NW  N   E
20 FT wind spd..2   2   2   2   2   2   3   4   5   6   6   6
20 FT wind gust.                            6   7   8   10  10
Ridge wind dir..SE  SE  SE  SE  S   W   W   NW  NW  NW  N   E
Ridge wind spd..5   5   5   5   5   5   10  10  10  10  15  15
Mix hgt (kft)...1.5 1.5 1.5 2.5 4.0 6.0 8.0 8.0 8.5 8.5 7.5 6.5
Transp wind dir.E   E   SE  SE  S   SW  W   NW  NW  N   N   E
Transp wind spd.7   7   7   7   7   7   8   9   10  12  13  13
SDspl kt-ft/100010  9   10  15  23  35  54  65  75  87  83  71

.FORECAST DAYS 3 THROUGH 5...
.TUESDAY...
Mostly cloudy with showers likely and chance of thunderstorms
after 1200L. Chance of wetting rain around 60 to 70 percent.
Lows in the upper 40s. Highs in the lower 70s. Light southeast
winds around 5 to 8 mph.
.WEDNESDAY...
Showers and chance of thunderstorms. Chance of wetting rain
around 70 to 80 percent. Lows in the upper 40s. Highs in the
mid 60s. Light south winds 5 to 10 mph.
.THURSDAY...
Mostly cloudy with showers and chance of thunderstorms. Chance
of wetting rain around 50 to 60 percent. Lows in the upper 40s.
Highs in the upper 60s. Light southwest winds 5 to 10 mph.

$$
Forecaster...Hensley
Requested by...E Folts
Type of request...WILDFIRE
.TAG 2520174.3/RIW
.DELDT 08/24/25
.FormatterVersion 2.0.0
.EMAIL ed_folts@partner.nps.gov,laura_dooley@nps.gov