211
FNUS75 KRIW 282148
FWSRIW

Spot Forecast for Basin Creek...Yellowstone NP
National Weather Service Riverton WY
348 PM MDT Tue Jul 28 2026

Forecast is based on forecast start time of 1600 MDT on July 28.
If conditions become unrepresentative, contact the National Weather
Service

.DISCUSSION...

Southwest winds continue the rest of today, with occasional gusts to
around 15 mph through 1800L. Then, southwest winds 5 to 7 mph
overnight. A few showers or storms are possible (15 percent) through
sunset, with gusty outflow winds to around 40 mph the main hazard.
Overnight, clouds decrease with patchy smoke from fires over the
western US making its way into the area. Low temperatures will be in
the low 50s between 0300 and 0800.

Wednesday, shower and thunderstorm chances increase around 1100,
with 20 to 40 percent chances through the remainder of the day.
Outside any storms, winds will be from the southwest around 10 mph,
with gusts 15 to 20 mph possible. Storm chances decrease by 2200,
with light winds Wednesday night. Smoke increases Wednesday night.

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

.REST OF TODAY...

Sky/weather.........Sunny (15-25 percent).
Chance of pcpn......10 percent until 1700.
Chance of thunder...10 percent.
Max temperature.....Around 82.
Min humidity........22-25 percent.
Wind (20 ft)........Southwest winds around 10 mph with occasional
                    gusts to around 15 mph until 1800, then
                    south-southwest winds around 7 mph or less.
                    Gusty and erratic winds possible near
                    thunderstorms.

TIME (MDT)      4PM 5PM
Sky (%).........20  15
Weather cov.....SCH
Weather type....RW
Tstm cov........SCH
Chc of pcpn (%).10  10
Chc of thdr (%).10  10
Temp............80  81
RH..............26  26
Wind chill (F)..79  80
20 FT wind dir..SW  S
20 FT wind spd..8   6
20 FT wind gust.12  10
Surface wnd dir.SW  S
Surface wnd spd.10  8
Surface wnd gst.15  12
Ceiling (kft)...24  24

.TONIGHT...

Sky/weather.........Mostly clear (20-30 percent). Patchy smoke
                    after 0300.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 48.
Max humidity........58-64 percent.
Wind (20 ft)........Southwest winds around 7 mph.


TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........15  25  25  30  30  30  25  25  25  25  20  20
Weather cov.....                                    PTY PTY PTY
Weather type....                                    SMK SMK SMK
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............79  77  74  66  62  60  59  58  56  55  53  52
RH..............28  33  40  44  50  52  53  55  57  58  58  60
Wind chill (F)..79  77  74  66  62  60  59  58  56  55  53  52
20 FT wind dir..SW  SW  S   S   SW  SW  SW  SW  S   SW  S   SW
20 FT wind spd..7   6   3   2   4   4   4   4   3   4   3   3
20 FT wind gust.10  10  4       6   6   6   6   5   6   4   4
Surface wnd dir.SW  SW  S   S   SW  SW  SW  SW  S   SW  S   SW
Surface wnd spd.9   8   4   3   5   5   5   5   4   5   4   4
Surface wnd gst.13  12  5       7   7   7   7   6   7   5   5
Ceiling (kft)...24  24  24  24  24  24  25  24  24  20  23  23

.FORECAST DAYS 2 THROUGH 4...
.WEDNESDAY...
Partly cloudy becoming mostly cloudy in the afternoon. Chance
(25 to 35 percent) of showers and thunderstorms starting around
1100 and continuing through the afternoon. Highs around 80.
Southwest winds 10 to 15 mph.
.WEDNESDAY NIGHT...
Mostly cloudy becoming partly cloudy after midnight. Increasing smoke
after midnight. Lows around 45. South winds around 5 mph.
.THURSDAY...
Partly cloudy with smoke. Highs around 80. Southwest winds around 10 mph.
.FRIDAY...
Mostly clear. Lows around 50. Highs in the mid 80s. West to southwest winds.

$$
Forecaster...Wittmann
Requested by...Jim Warren
Type of request...SAR
.TAG 2618527.0/RIW
.DELDT 07/28/26
.FormatterVersion 2.0.0
.EMAIL jim_warren@nps.gov