Suppression Forecast
Issued by NWS Riverton, WY

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FNUS75 KRIW 171213
FWSRIW

Spot Forecast for Sylvan Bay Piles...USFS
National Weather Service Riverton WY
513 AM MST Fri Nov 17 2017

Forecast is based on ignition time of 0900 MST on November 17.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...Colder today with periods of light snow.
Breezy to windy in exposed terrain with less wind in sheltered
locations. The snow ends around sunset with decreasing clouds
late in the night. Saturday will be dry and cold with some
afternoon wind.

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

FORECASTER...AR

.TODAY...

Sky/weather.........Cloudy. Periods of snow showers.
Max temperature.....30-33.
Min humidity........68-71 percent.
20-foot winds.......West to northwest at 10 to 15 mph with
                    gusts around 20 mph.

Ridge top winds.....West to northwest at 15 to 20 mph with
                    gusts around 25 mph.

LAL.................No Tstms.
Chc of wetting rain.73 percent.
Haines Index........2 or very low potential for large plume
                    dominated fire growth.
Mixing height.......2000-3000 ft AGL.
Transport winds.....West at 15 to 20 mph.
Smoke dispersal.....Poor this morning. Poor to Fair after 1200.

.TONIGHT...

Sky/weather.........A chance of snow showers until 2100.
                    Decreasing clouds after midnight.
Min temperature.....9-12.
Max humidity........84-87 percent.
20-foot winds.......West to Northwest at 8 to 12 mph until 2100.
                    After 2100 wind becoming
                    downslope/downvalley 4-7 mph.

Ridge top winds.....West to Northwest at 10 to 15 mph until 2100.
                    After 2100...west to northwest at 5 to 10 mph.

LAL.................No Tstms.
Chc of wetting rain.4 percent.
Haines Index........2 or very low potential for large plume
                    dominated fire growth.
Mixing height.......500-1000 ft AGL.
Transport winds.....West to Northwest at 10 to 15 mph until 2100.
                    West to northwest ar 5 to 10 mph after 2100.
Smoke dispersal.....becoming Poor by 2100.

.SATURDAY...

Sky/weather.........Mostly sunny.
Max temperature.....26-29.
Min humidity........40-43 percent.
20-foot winds.......Upslope/upvalley at 4 to 8 mph until 1200.
                    West to northwest at 6 to 11 mph after 1200.

Ridge top winds.....West to Northwest at 5 to 10 mph until 1200.
                    West to northwest at 9 to 14 mph after 1200.

LAL.................No Tstms.
Chc of wetting rain.Zero percent.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.
Mixing height.......1500-2500 ft AGL.
Transport winds.....West to Northwest around 10 mph.
Smoke dispersal.....Poor.

.FORECAST DAYS 3 THROUGH 5...

.SATURDAY NIGHT...
Clear. Lows around 5. Winds generally less than 10 mph.

.SUNDAY...
Mostly clear. Highs in the upper 20s to lower 30s.
Winds generally less than 10 mph.

.MONDAY...
Mostly cloudy with chance of snow showers. Lows 10 to 15. Highs
in the mid 30s. Winds generally less than 10 mph.

.TUESDAY...
Partly cloudy. Slight chance of snow showers. Lows around 20.
Highs in the upper 30s. Winds generally less than 10 mph.

$$
Forecaster...Ross
Requested by...Dave Wilkins
Type of request...PRESCRIBED
.TAG 1718606.5/RIW
.EMAIL dawilkins@fs.fed.us



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