Suppression Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
573
FNUS75 KRIW 082118
FWSRIW
Spot Forecast for Slough South RX...NPS
National Weather Service Riverton WY
318 PM MDT Thu May 8 2025
Forecast is based on ignition time of 1000 MDT on May 12.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
A weekend ridge of high pressure begins to break down late Sunday
and Monday as a weather system approaches from the west.
Unseasonably warm weekend high temperatures cool to seasonal
normals Monday and fall to below normal Tuesday onward. The wettest
period comes Tuesday afternoon through Wednesday as the weather
disturbance crosses the region. Cool and unsettled weather lingers
through at least Thursday, May 15.
...Thunderstorms imply strong gusty and erratic winds...
.MONDAY...
Sky/weather.........Partly cloudy (40-60 percent) with a
chance of rain showers. Isolated afternoon
thunderstorms.
CWR.................0 percent.
Chance of pcpn......40 percent.
Chance of thunder...18 percent.
Max temperature.....Around 62.
Min humidity........37 percent.
Wind (20 ft)........Southwest wind 10 to 14 mph. Gusts up to 18
mph developing between 1000 and 1200, then
increasing to 24 to 28 mph early in the afternoon.
Gusty and erratic winds expected near
thunderstorms in the afternoon.
Ridgetop wind.......Southwest 15 to 20 mph.
Mixing height.......Gradually rising to around 7000 ft AGL by 1400.
Transport winds.....Southwest 18 to 22 mph.
Smoke dispersal.....Becoming Excellent between 1200 and 1400.
TIME (MDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........45 45 45 45 45 45 45 45
Weather cov.....CHC CHC CHC CHC CHC CHC CHC CHC
Weather type....RW RW RW RW RW RW RW RW
Tstm cov........ SCH SCH SCH SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0
Chc of pcpn (%).30 30 40 40 40 40 40 40
Chc of thdr (%).0 0 20 20 20 20 20 20
Temp............50 52 54 55 56 56 56 56
RH..............60 54 49 44 40 37 35 35
20 FT wind dir..S S SW SW SW SW SW SW
20 FT wind spd..10 10 14 14 14 14 14 14
20 FT wind gust.14 14 22 22 22 22 22 22
Ridge wind dir..S S SW SW SW SW SW SW
Ridge wind spd..15 15 20 20 20 20 20 20
Mix hgt (kft)...5.0 7.0 9.0 9.0 8.5 8.5 7.5 6.0
Transp wind dir.SW W W W SW SW SW W
Transp wind spd.17 17 22 22 22 22 22 22
SDspl kt-ft/100073 105 173 169 164 159 139 119
.MONDAY NIGHT...
Sky/weather.........Mostly cloudy (60-70 percent) with a chance
of rain showers.
CWR.................0 percent.
Chance of pcpn......30 percent.
Chance of thunder...6 percent.
Min temperature.....Around 36.
Max humidity........68 percent.
Wind (20 ft)........Southwest wind 8 to 11 mph with gusts to
14 to 18 mph.
Ridgetop wind.......Southwest 15 to 20 mph.
Mixing height.......Gradually decreasing to less than
2500 ft AGL between 2100 and 2300.
Transport winds.....Southwest 15 to 18 mph.
Smoke dispersal.....Good early in the evening, then decreasing
to Poor between 2200 and 2400.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P 12A 1AM 2AM 3AM 4AM 5AM
Sky (%).........50 50 50 50 50 50 40 40 40 40 40 40
Weather cov.....CHC CHC CHC CHC CHC CHC SCH SCH SCH SCH SCH SCH
Weather type....RW RW RW RW RW RW RW RW RW RW RW RW
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).30 30 30 30 30 30 20 20 20 20 20 20
Chc of thdr (%).10 10 10 10 10 10 0 0 0 0 0 0
Temp............55 53 50 47 45 44 43 42 41 40 39 38
RH..............36 40 45 50 53 56 58 60 61 63 66 68
20 FT wind dir..SW SW SW SW SW SW S S S S S S
20 FT wind spd..11 11 11 11 11 11 8 8 8 8 8 8
20 FT wind gust.18 18 18 18 18 18 13 13 13 13 13 13
Ridge wind dir..SW SW SW SW SW SW S S S S S S
Ridge wind spd..20 20 20 20 20 20 15 15 15 15 15 15
Mix hgt (kft)...5.0 4.5 3.5 3.0 3.0 3.0 3.0 3.0 3.0 3.0 2.5 2.5
Transp wind dir.W SW SW SW SW SW SW SW SW SW SW SW
Transp wind spd.18 18 18 18 18 18 15 15 15 15 15 15
SDspl kt-ft/100083 71 58 46 46 46 37 38 39 39 36 32
.TUESDAY...
Sky/weather.........Mostly cloudy (60-70 percent). A chance of
rain showers in the morning, then rain showers
likely and a slight chance of thunderstorms in
the afternoon.
CWR.................0 percent increasing to 40 percent in the
afternoon.
Chance of pcpn......60 percent.
Chance of thunder...15 percent.
Max temperature.....Near 50.
Min humidity........47 percent.
Wind (20 ft)........Southwest wind 8 to 11 mph with gusts to
around 18 mph. Gusty and erratic winds expected
near thunderstorms in the afternoon.
Ridgetop wind.......Southwest 15 to 20 mph.
Mixing height.......Gradually rising to 5000 to 6000 ft AGL by 1400.
Transport winds.....Southwest 15 to 18 mph until 1400, then slowly
shifting to the west-northwest late in the day.
Smoke dispersal.....Poor until 0900, then becoming Good by 1300.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........45 45 45 45 45 45 65 65 65 65 65 65
Weather cov.....CHC CHC CHC CHC CHC CHC LKY LKY LKY LKY LKY LKY
Weather type....RW RW RW RW RW RW RW RW RW RW RW RW
Tstm cov........ SCH SCH SCH SCH SCH SCH
CWR.............0 0 0 0 0 0 40 40 40 40 40 40
Chc of pcpn (%).30 30 30 30 30 30 60 60 60 60 60 60
Chc of thdr (%).0 0 0 0 0 0 20 20 20 20 20 20
Temp............38 39 41 43 45 47 48 49 48 48 48 47
RH..............69 67 64 60 56 52 49 46 44 43 43 44
20 FT wind dir..SW SW SW SW SW SW W W W W W W
20 FT wind spd..8 8 8 8 8 8 11 11 11 11 11 11
20 FT wind gust.12 12 12 12 12 12 18 18 18 18 18 18
Ridge wind dir..SW SW SW SW SW SW W W W W W W
Ridge wind spd..15 15 15 15 15 15 20 20 20 20 20 20
Mix hgt (kft)...2.0 2.5 3.0 3.0 4.0 4.5 5.0 5.5 6.0 6.0 5.5 5.0
Transp wind dir.SW SW SW SW SW W W W W NW NW NW
Transp wind spd.15 15 15 15 15 15 18 18 18 18 18 18
SDspl kt-ft/100028 33 37 42 75 75 90 99 108 108 99 90
.FORECAST DAYS 3 THROUGH 5...
.TUESDAY NIGHT...
Rain and snow showers likely. Lows in the lower 30s. Westerly
wind around 10 mph.
.WEDNESDAY...
Morning rain and snow showers, becoming all rain by midday,
possibly mixing with snow again after sunset. A slight chance
of afternoon thunderstorms. Highs in the mid 40s. Lows in the
lower 30s. Westerly wind around 10 mph.
.THURSDAY...
Mostly cloudy with a chance of showers, possibly mixing with
snow in the morning. Isolated afternoon thunderstorms. Highs
around 50. Lows in the lower 30s. Southwest wind around 10 mph.
.FRIDAY...
Mostly cloudy with a chance of showers. Highs near 50.
West wind around 10 mph.
$$
Forecaster...CNJ
Requested by...Paul Hood
Type of request...PRESCRIBED
.TAG 2513554.0/RIW
.DELDT 05/08/25
.FormatterVersion 2.0.0
.EMAIL paul_hood@nps.gov