Suppression Forecast
Issued by NWS Riverton, WY

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769
FNUS75 KRIW 260923
FWSRIW

Spot Forecast for South Pass...USFS
National Weather Service Riverton WY
323 AM MDT Wed Apr 26 2017

Forecast is based on ignition time of 0800 MDT on April 26.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...
Gusty west winds today through tonight with isolated snow showers
in the area. There is a small chance of an afternoon thunderstorm.
A stronger storm system will move in Thursday with snow expected on
Thursday with a couple inches expected. Winds will decrease as the day
wears on Thursday.

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

FORECASTER...Skrbac

.TODAY...

Sky/weather.........Mostly cloudy (75-85 percent). Isolated snow
                    showers with a slight chance of an afternoon thunderstorm.
Max temperature.....40-43.
Min humidity........56-59 percent.
20-foot winds.......West winds 10 to 15 mph. Increasing to 15 mph
                    to 25 mph after 1000L. Gusty and erratic winds expected
                    if a thunderstorm forms in the area.
Ridge top winds.....West to northwest 20 to 25 mph
LAL.................No Tstms until 1200, then 2.
Chc of wetting rain.Less than 5 percent.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.
Mixing height.......Gradually increasing from 2000 ft AGL to around 4000 ft AGL by noon
                    then increasing to 8000-8500 ft AGL after 1500L.
Transport winds.....West 16 to 21 mph.
Smoke dispersal.....Fair early then increasing to good by noon and excellent by 1500L.

.TONIGHT...

Sky/weather.........Cloudy (95-100 percent). Scattered snow
                    showers, isolated showers and thunderstorms in
                    the evening, then snow likely after midnight.
Min temperature.....24-27.
Max humidity........90-93 percent.
20-foot winds.......West winds 13 to 16 mph with gusts to around 30
                    mph. Gusty and erratic winds expected near
                    thunderstorms in the evening.
Ridge top winds.....West around 20 mph increasing to around 30 mph after midnight.
LAL.................2 until 2400, then 1.
Chc of wetting rain.10 percent.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.
Mixing height.......Around 4000 ft AGL until 2000L then decreasing to 1600-2600 ft AGL.
Transport winds.....West 14 to 21 mph.
Smoke dispersal.....Good early in the evening then decreasing to Poor to Fair.

.THURSDAY...

Sky/weather.........Cloudy (95-100 percent) with Snow.
Max temperature.....30-33.
Min humidity........70-80 percent.
20-foot winds.......Northwest winds around 13 mph with gusts to around
                    25 mph early in the morning becoming
                    upslope/upvalley 5-9 mph.
Ridge top winds.....Northwest 15 to 20 mph shifting to the north
                    around 10 mph late in the afternoon.
LAL.................No Tstms.
Chc of wetting rain.80-90 percent.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.
Mixing height.......3400-4400 ft AGL.
Transport winds.....Northwest 15 to 20 mph becoming north to northeast at 5 to 10 mph
                    in the afternoon.
Smoke dispersal.....Fair to good.

.FORECAST DAYS 3 THROUGH 5...
.THURSDAY NIGHT...
Snow. Lows in the lower 20s. Winds generally less than 10 mph.
.FRIDAY...
Snow. Lows in the lower 20s. Highs around 30. North winds around
12 mph.
.SATURDAY...
Partly cloudy. Scattered snow showers. Lows in the lower 20s.
Highs in the lower 30s. Winds generally less than 10 mph.
.SUNDAY...
Partly cloudy. Lows in the lower 20s. Highs in the lower 40s.
West winds around 11 mph.

$$
Forecaster...Skrbac
Requested by...Brett Heller
Type of request...PRESCRIBED
.TAG 1707787.0/RIW
.EMAIL bheller@fs.fed.us



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