511
FNUS75 KRIW 282321
FWSRIW

Spot Forecast for King SAR...Yellowstone National Park
National Weather Service Riverton WY
521 PM MDT Sat Sep 28 2024

Forecast is based on forecast start time of 0600 MDT on September 29.
If conditions become unrepresentative, contact the National Weather
Service

.DISCUSSION...

No real change from the previous forecast. Southwest winds begin to
increase by the middle of Sunday morning. Near surface winds will be
around 20 mph by late morning, with gusts around 30 mph. These winds
increase further after 1200L, with gusts around 45 mph. Expect the
strongest winds, potentially near 50 mph, at the highest elevations.
Winds decrease some into Sunday night, but sustained winds around
25 or 30 mph continue, with gusts around 35 mph. Winds shift more
westerly around sunrise Monday, with gusts around 25 mph.

As for temperatures, highs Sunday are in the mid-60s for the higher
elevations. A strong cold front moves through Sunday night, with
lows around 30 Monday morning. With the winds, wind chill temperatures
fall near 20 degrees. Highs Monday around 50 degrees, but wind chill
will be in the lower 40s. Monday night will be colder than Sunday night.

...Thunderstorms imply strong gusty and erratic winds...
...Haines index is high level haines both day and night...

.SUNDAY...

Sky/weather.........Sunny (5-10 percent).
Chance of pcpn......0 percent.
Max temperature.....Around 67.
Min humidity........17 percent.
Min apparent temp...30.
Surface winds (mph).Southwest winds 15 to 25 mph. Gusts up to 30
                    mph in the morning increasing to around 43 mph
                    after 12 pm.
Wind (20 ft)........Southwest winds 15 to 25 mph. Gusts up to 30
                    mph increasing to around 45 mph in the afternoon.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........5   10  15  15  10  10  10  5   10  10  10  5
Weather cov.....
Weather type....
Tstm cov........
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............39  39  40  49  58  62  65  66  66  66  64  62
RH..............50  50  50  37  27  23  21  21  19  18  17  19
Wind chill (F)..M   M   M   M   M   M   M   M   M   M   M   M
20 FT wind dir..SW  SW  S   SW  SW  SW  SW  SW  SW  SW  W   W
20 FT wind spd..13  13  14  14  16  17  18  20  20  20  21  21
20 FT wind gust.17  18  20  21  25  28  30  32  32  33  33  33
Surface wnd dir.SW  SW  S   SW  SW  SW  SW  SW  SW  SW  W   W
Surface wnd spd.16  16  18  18  20  21  23  25  25  25  26  26
Surface wnd gst.21  22  25  26  31  35  38  40  40  41  41  41

.SUNDAY NIGHT...

Sky/weather.........Mostly clear (5-10 percent).
Chance of pcpn......0 percent.
Min temperature.....Around 30.
Max humidity........63 percent.
Min apparent temp...20.
Surface winds (mph).Breezy. Southwest winds 20 to 30 mph. Gusts up
                    to 45 mph decreasing to 30 mph after 3 am.
Wind (20 ft)........Breezy. Southwest winds 18 to 26 mph. Gusts up
                    to 45 mph decreasing to 35 mph after 3 am.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........10  5   10  10  5   5   5   5   5   5   5   5
Weather cov.....
Weather type....
Tstm cov........
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............59  54  50  47  45  43  41  40  38  37  35  34
RH..............20  26  30  32  33  36  39  42  46  50  56  58
Wind chill (F)..M   M   M   M   M   M   M   M   M   M   M   M
20 FT wind dir..W   W   W   SW  SW  SW  SW  SW  SW  SW  SW  SW
20 FT wind spd..19  21  24  26  26  26  25  24  23  22  20  18
20 FT wind gust.33  34  36  37  35  34  32  31  30  29  26  24
Surface wnd dir.W   W   W   SW  SW  SW  SW  SW  SW  SW  SW  SW
Surface wnd spd.24  26  30  33  33  33  31  30  29  28  25  23
Surface wnd gst.41  43  45  46  44  43  40  39  38  36  32  30

.MONDAY...

Sky/weather.........Sunny (5-25 percent).
Chance of pcpn......0 percent.
Max temperature.....Around 50.
Min humidity........16 percent.
Min apparent temp...20.
Surface winds (mph).West winds 15 to 20 mph with gusts to around 28
                    mph.
Wind (20 ft)........West winds 12 to 18 mph with gusts to around 22
                    mph.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........5   5   10  10  10  10  5   15  20  30  30  30
Weather cov.....
Weather type....
Tstm cov........
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............33  32  33  36  40  42  45  48  49  49  49  48
RH..............61  63  58  50  39  31  23  19  18  17  16  17
Wind chill (F)..M   M   M   M   M   M   M   M   M   M   M   M
20 FT wind dir..W   W   W   W   W   W   W   W   W   W   W   W
20 FT wind spd..17  15  13  13  12  13  13  13  14  14  13  13
20 FT wind gust.22  20  19  19  19  19  20  21  22  22  22  21
Surface wnd dir.W   W   W   W   W   W   W   W   W   W   W   W
Surface wnd spd.21  19  16  16  15  16  16  16  18  18  16  16
Surface wnd gst.28  25  24  24  24  24  25  26  28  28  28  26

.FORECAST DAYS 3 THROUGH 5...
.TUESDAY...
Partly cloudy. Lows in the upper 20s. Highs in the lower 50s.
West to southwest winds 10 to 15 mph, with afternoon gusts
around 25 mph.
.WEDNESDAY...
Mostly clear. Lows in the mid 30s. Highs in the lower 50s.
West to southwest winds around 18 mph, with afternoon gusts
around 30 mph.
.THURSDAY...
Mostly clear. Lows in the lower 30s. Highs around 50. West to
southwest winds around 15 mph, with afternoon gusts around 24 mph.

$$
Forecaster...Wittmann
Requested by...Jim Warren
Type of request...SAR
.TAG 2423196.0/RIW
.DELDT 09/28/24
.FormatterVersion 2.0.0
.EMAIL marlee_jennings@nps.gov,jim_warren@nps.gov