Suppression Forecast
Issued by NWS Riverton, WY

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030
FNUS75 KRIW 281009
FWSRIW

Spot Forecast for June Fire...USFS SHF
National Weather Service Riverton WY
409 AM MDT Fri Jul 28 2017

Forecast is based on request time of 0700 MDT on July 28.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...

Isolated thunderstorms are expected across the area this afternoon
and evening, but the coverage will be less than what has occurred
over the past couple of days. Winds will be generally terrain
driven, but becoming dominated by breezy, thunderstorm outflow
winds by mid-afternoon. A few gusts between 35 and 45 mph could
occur.

Drier and warmer Saturday, but with continued mainly light,
terrain driven winds.

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

FORECASTER...Murrell

.TODAY...

Sky/weather.........Patchy fog early this morning, otherwise mostly
                    sunny (10-20 percent) this morning. Partly cloudy
                    (50-60 percent) with isolated thunderstorms in
                    the afternoon.
Max temperature.....73-78.
Min humidity........30-35 percent.
20-foot winds.......Upslope/upvalley 4-8 mph...becoming dominated
                    by variable and gusty thunderstorms winds by
                    around 2 PM.
Ridge top winds.....West 5-10 mph shifting to the east southeast
                    between Noon and 2 PM.
LAL.................No Tstms until 1200, then 1-8 strikes.
Chc of wetting rain.10 percent.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.
Mixing height.......8200 ft AGL.
Transport winds.....West to Northwest around 10 mph shifting to
                    the south in the afternoon.
Smoke dispersal.....Good.

.TONIGHT...

Sky/weather.........Partly cloudy (40-50 percent). Isolated showers
                    and thunderstorms in the evening.
Min temperature.....50-55.
Max humidity........55-60 percent.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusty and erratic
                    winds expected near thunderstorms in the
                    evening.
Ridge top winds.....East southeast around 10 mph, becoming south
                    to southwest 5-10 mph by midnight.
LAL.................1-8 strikes until 9 PM, then No Tstms.
Chc of wetting rain.5 percent.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.
Mixing height.......Decreasing to less than 1000 ft AGL by 9 PM.
Transport winds.....East southeast around 10 mph, becoming south
                    to southwest 5-10 mph by midnight.
Smoke dispersal.....Poor by 9 PM.

.SATURDAY...

Sky/weather.........Mostly sunny (20-30 percent) then becoming
                    partly cloudy (30-40 percent) with a very
                    isolated thunderstorm possible in the afternoon.
Max temperature.....75-80.
Min humidity........20-25 percent.
20-foot winds.......Upslope/upvalley 5-9 mph. Gusty and erratic
                    winds near any thunderstorms.
Ridge top winds.....Northwest 5-10 mph becoming east northeast
                    5-10 mph by around 3 PM.
LAL.................No Tstms through Noon, then 1-8 strikes.
Chc of wetting rain.Near zero percent.
Haines Index........4 or low potential for large plume dominated
                    fire growth.
Mixing height.......10700 ft AGL in the afternoon.
Transport winds.....Northwest 5-10 mph becoming northeast around
                    10 mph in the afternoon.
Smoke dispersal.....Very Good.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY NIGHT...Partly cloudy with a very isolated thunderstorm
possible through 8 PM, then mostly clear. Lows in the mid 50s.
Winds generally less than 10 mph.

.SUNDAY...Partly cloudy with slight chance of showers and
thunderstorms. Highs in the mid 70s. Winds generally less than 10
mph.

.MONDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the lower 50s. Highs in the mid 70s. Winds
generally less than 10 mph.

.TUESDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the lower 50s. Highs in the upper 70s.
Winds generally less than 10 mph.

$$
Forecaster...Murrell
Requested by...Cody Wienk
Type of request...WILDFIRE
.TAG 1713074.1/RIW
.EMAIL cody_wienk@nps.gov



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