054
FNUS75 KRIW 042331
FWSRIW

Spot Forecast for Life flight...NPS
National Weather Service Riverton WY
531 PM MDT Mon May 4 2026

Forecast is based on forecast start time of 1800 MDT on May 04.
If conditions become unrepresentative, contact the National Weather
Service

.DISCUSSION...

A cold front moved through the area earlier today. The frontal passage
will keep winds from the north at around 5-10 mph this evening
with a few periodic gusts of 15-20 mph. Clouds are expected to
gradually build in over the next 1-3 hours. Precipitation chances
should hold off until about 8-9 PM, after that a few isolated
snow showers may be possible through the late evening hours Monday
into early Tuesday morning.

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

.TONIGHT...

Sky/weather.........Partly cloudy (40-50 percent) then becoming
                    mostly cloudy (65-75 percent).
Chance of pcpn......10 percent.
Chance of thunder...4 percent.
Min temperature.....Around 27.
Max humidity........85 percent.
Min apparent temp...24.
Surface winds (mph).Light winds.
Wind (20 ft)........Light winds.
CEILING (KFT).......17 decreasing to 8.3 late in the evening decreasing to
                    decreasing to 3.7 after 3 am increasing to 5.7
                    increasing to 7.8 early in the morning.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........35  35  50  60  60  70  75  70  65  60  40  30
Weather cov.....
Weather type....
Tstm cov........
Chc of pcpn (%).10  10  10  10  0   0   10  0   0   10  0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............55  51  47  43  40  37  36  34  33  32  30  29
RH..............36  44  53  66  72  76  77  80  81  85  84  84
Wind chill (F)..55  51  43  38  35  32  31  30  29  27  25  24
20 FT wind dir..N   N   N   N   N   N   N   N   N   N   N   N
20 FT wind spd..6   6   6   5   4   4   4   4   4   4   4   4
20 FT wind gust.10  10  8   6   6   6   6   6   6   6   6   6
Surface wnd dir.N   N   N   N   N   N   N   N   N   N   N   N
Surface wnd spd.8   8   8   6   5   5   5   5   5   5   5   5
Surface wnd gst.13  13  10  8   8   8   7   7   7   7   7   8
Ceiling (kft)...17  13  14  11  11  8.3 7.0 5.8 4.8 3.7 5.7 7.8

.TUESDAY...

Sky/weather.........Mostly sunny (35-45 percent).
Chance of pcpn......10 percent.
Chance of thunder...11 percent.
Max temperature.....Around 40.
Min humidity........30 percent.
Min apparent temp...20.
Surface winds (mph).Light winds until 0800, then north 9 to 14 mph
                    with gusts to around 21 mph.
Wind (20 ft)........North winds 7 to 11 mph with gusts to around 17
                    mph.
CEILING (KFT).......6.9 increasing to 9.4 early in the morning,
                    then decreasing to 8.4 late in the morning
                    increasing to 9.4 late in the morning
                    increasing to 10.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........30  25  20  20  20  25  35  35  30  50  55  50
Weather cov.....                                    ISO ISO ISO
Weather type....                                    SW  SW  SW
Tstm cov........                                    ISO ISO ISO
Chc of pcpn (%).0   0   0   0   0   0   0   0   10  10  10  10
Chc of thdr (%).0   0   0   0   0   0   0   0   10  10  10  10
Temp............28  27  29  32  36  38  39  39  39  39  38  37
RH..............85  80  74  62  50  41  36  33  32  31  31  31
Wind chill (F)..23  20  20  24  29  31  31  31  31  31  30  28
20 FT wind dir..N   N   N   N   N   N   N   N   N   N   N   N
20 FT wind spd..4   5   7   8   8   9   10  10  11  11  11  11
20 FT wind gust.6   7   11  13  13  14  16  16  17  17  17  17
Surface wnd dir.N   N   N   N   N   N   N   N   N   N   N   N
Surface wnd spd.5   6   9   10  10  11  13  13  14  14  14  14
Surface wnd gst.8   9   14  16  16  17  20  20  21  21  21  21
Ceiling (kft)...7.6 6.9 9.4 8.4 9.4 12  11  10  10  10  11  11

$$
Forecaster...Dziewaltowski
Requested by...Laura Dooley
Type of request...SAR
.TAG 2612698.0/RIW
.DELDT 05/04/26
.FormatterVersion 2.0.0
.EMAIL laura_dooley@nps.gov