Spot Forecast
Issued by NWS Riverton, WY

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FNUS75 KRIW 131043
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Spot Forecast for Star Valley Front Rx...USFS BTF
National Weather Service Riverton WY
443 AM MDT Sat Apr 13 2024

Forecast is based on ignition time of 0900 MDT on April 13.
If conditions become unrepresentative, contact the National Weather
Service

.DISCUSSION...

Dry conditions will be in place today. There is a very slight
chance (10%) for a virga shower between 1500 and 1700 this
afternoon. If any shower were to occur, it would only be an impact
for 15 minutes or less. Otherwise, high clouds will increase this
afternoon stream over the area. Winds will be light and southerly,
with gusts up to 15 mph this afternoon.

Similar conditions return Sunday, with a slight chance (10-15%)
for rain showers again between 1600 and 1900.

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

.TODAY...

Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
LAL.................1.
Max temperature.....Around 59.
Min humidity........29 percent.
Wind (20 ft)........South winds 6 to 7 mph shifting to the
                    southwest late in the afternoon.
Ridgetop wind.......Southwest around 15 mph.
Mixing height.......700 ft AGL increasing to 4900 ft AGL.
Transport winds.....South 13 to 14 mph.
Smoke dispersal.....Poor early in the morning increasing to fair
                    by 1500.
Haines Index........3 to 4 or very low to low potential for large
                    plume dominated fire growth.

TIME (MDT)      9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........3   2   2   2   9   16  23  22  21
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0
Chc of pcpn (%).0   0   0   0   0   0   0   0   0
LAL.............1   1   1   1   1   1   1   1   1
Temp............43  46  50  54  56  57  59  58  57
RH..............56  50  45  39  36  33  29  30  30
20 FT wind dir..S   S   S   S   SW  SW  SW  SW  SW
20 FT wind spd..6   6   7   7   7   7   7   7   6
20 FT wind gust.10  10  11  11  11  11  11  11  10
Ridge wind dir..S   S   S   SW  SW  SW  SW  SW  SW
Ridge wind spd..15  15  15  15  15  15  15  15  15
Mix hgt (kft)...0.7 0.7 0.7 3.5 3.5 3.5 4.9 4.9 4.9
Transp wind dir.S   S   S   SW  SW  SW  SW  SW  SW
Transp wind spd.13  13  13  14  14  14  14  14  14
Haines index....4   4   4   3   3   3   3   3   3
SDspl kt-ft/10007   7   7   42  42  42  58  58  58

.TONIGHT...

Sky/weather.........Mostly clear (5-15 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
LAL.................1.
Min temperature.....Around 34.
Max humidity........55 percent.
Wind (20 ft)........South winds around 6 mph shifting to the
                    southeast early in the evening.
Ridgetop wind.......Southeast around 10 mph.
Mixing height.......3700 ft AGL decreasing to 500 ft AGL
                    after 2100.
Transport winds.....South around 12 mph shifting to the southeast
                    after 2100.
Smoke dispersal.....Poor.
Haines Index........4 or low potential for large plume dominated
                    fire growth.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........20  16  12  9   6   4   2   2   2   2   2   2
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   0   0   0
LAL.............1   1   1   1   1   1   1   1   1   1   1   1
Temp............57  53  48  43  41  40  38  37  37  36  35  34
RH..............30  36  44  51  52  52  53  53  53  54  54  55
20 FT wind dir..SW  S   SE  SE  SE  SE  SE  SE  SE  SE  SE  SE
20 FT wind spd..6   6   6   6   6   6   6   6   6   6   6   6
20 FT wind gust.10  8   8   8   8   8   8   8   8   8   8   8
Ridge wind dir..S   S   S   SE  SE  SE  SE  SE  SE  SE  SE  SE
Ridge wind spd..10  10  10  10  10  10  10  10  10  10  10  10
Mix hgt (kft)...3.7 3.7 3.7 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.S   S   S   SE  SE  SE  SE  SE  SE  S   S   S
Transp wind spd.12  12  12  12  12  12  12  12  12  12  12  12
Haines index....4   4   4   4   4   4   4   4   4   4   4   4
SDspl kt-ft/100037  37  37  5   5   5   5   5   5   5   5   5

.SUNDAY...

Sky/weather.........Sunny (10-20 percent). Slight chance of rain
                    showers late in the afternoon.
CWR.................0 percent.
Chance of pcpn......20 percent.
LAL.................1.
Max temperature.....Around 57.
Min humidity........25 percent.
Wind (20 ft)........Southeast winds around 5 mph early in the
                    morning becoming light, then becoming southwest
                    5 to 10 mph late in the morning.
Ridgetop wind.......South around 10 mph shifting to the southwest
                    in the afternoon.
Mixing height.......1000 ft AGL increasing to 6900 ft AGL.
Transport winds.....South 10 to 15 mph.
Smoke dispersal.....Poor early in the morning increasing to
                    good by 1500.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........2   2   2   2   3   5   6   12  19  25  27  28
Weather cov.....                                            SCH
Weather type....                                            RW
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   0   10  20
LAL.............1   1   1   1   1   1   1   1   1   1   1   1
Temp............34  36  39  41  46  50  54  55  56  57  54  51
RH..............55  53  51  49  43  38  32  30  27  25  28  32
20 FT wind dir..SE  S   S   S   S   SW  SW  SW  SW  SW  SW  W
20 FT wind spd..5   5   4   4   4   5   6   6   8   9   9   7
20 FT wind gust.7   7   6   6   6   7   8   10  13  14  14  11
Ridge wind dir..S   S   S   SW  SW  SW  SW  SW  SW  SW  SW  SW
Ridge wind spd..10  10  10  10  10  10  15  15  15  15  15  15
Mix hgt (kft)...0.5 0.5 0.5 1.0 1.0 1.0 5.3 5.3 5.3 6.9 6.9 6.9
Transp wind dir.S   S   S   S   S   S   S   S   S   S   S   S
Transp wind spd.10  10  10  9   9   9   13  13  13  15  15  15
Haines index....3   3   3   3   3   3   3   3   3   3   3   3
SDspl kt-ft/10005   5   5   8   8   8   58  58  58  90  90  90

.FORECAST DAYS 3 THROUGH 5...
.MONDAY...
Mostly cloudy. Chance of showers and snow showers. Lows in the
lower 30s. Highs in the upper 40s. North winds around 5 mph.
.TUESDAY...
Mostly cloudy. Slight chance of showers and snow showers. Lows in
the lower 30s. Highs in the mid 40s. West winds around 8 mph.
.WEDNESDAY...
Mostly cloudy. Chance of snow showers and showers. Lows around
30. Highs in the lower 40s. West winds around 10 mph.

$$
Forecaster...LaVoie
Requested by...Michael McEwen
Type of request...PRESCRIBED
.TAG 2410508.0/RIW
.DELDT 04/13/24
.FormatterVersion 2.0.0
.EMAIL michael.mcewen@usda.gov
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