Suppression Forecast
Issued by NWS Riverton, WY

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754
FNUS75 KRIW 221207
FWSRIW

Spot Forecast for Starr Valley Ranches Pile Burns...USFS BTF
National Weather Service Riverton WY
607 AM MDT Tue May 22 2018

Forecast is based on ignition time of 0900 MDT on May 22.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...A chance of morning showers, then a chance of
showers and thunderstorms after 1100 through sunset this evening.
There will likely be some dry hours between shower and storm
activity, but the lack of drying and sunshine will keep relative
humidity fairly high today. Wednesday looks mostly cloudy as well
with a chance of showers and isolated thunderstorms. Thursday and
Friday look dry and warmer with lower afternoon humidity.

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

FORECASTER...AR

.TODAY...

Sky/weather.........Mostly cloudy. Chance of rain showers after
                    0900.  Then a better chance of showers and
                    thunderstorms after 1100.
Max temperature.....60-63.
Min humidity........47-50 percent.
20-foot winds.......East to southeast at 4 to 7 mph.

                    Gusty and erratic wind speeds to 20 mph
                    expected near thunderstorms.

Ridge top winds.....East to southeast at 9 to 13 mph with gusts
                    to 18 mph.

LAL.................1 until 1100, then 2.
Chc of wetting rain.64 percent.
Haines Index........3 or very low potential for large plume dominated
                    fire growth.
Mixing height.......Increasing to 4000-5000 FT AGL.
Transport winds.....East to southeast at 12 mph.
Smoke dispersal.....Becoming Fair after 1100.

.TONIGHT...

Sky/weather.........Mostly cloudy. A chance of showers and
                    thunderstorms until 2200. Isolated showers
                    after 2200.
Min temperature.....41-44.
Max humidity........88-91 percent.
20-foot winds.......East to southeast at 5 to 7 mph.
                    Gusty and erratic wind speeds to 25 mph
                    expected near thunderstorms.
Ridge top winds.....South to Southeast at 5 to 10 mph.
LAL.................2 until 2200, then LAL of 1.
Chc of wetting rain.58 percent.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.
Mixing height.......Decreasing to 500 FT AGL after sunset.
Transport winds.....South to southeast at 10 mph.
Smoke dispersal.....Fair until sunset, then Poor.

.WEDNESDAY...

Sky/weather.........Mostly cloudy. Chance of rain showers.
                    Isolated afternoon thunderstorms.
Max temperature.....55-58.
Min humidity........65-68 percent.
20-foot winds.......South to southwest at 5 to 9 mph until 1200.
                    Southwest to west at 7 to 11 mph after 1200.

                    Gusty and erratic wind speeds to 25 mph
                    expected near thunderstorms.

Ridge top winds.....Southwest 12 to 17 mph.
LAL.................1 until 1200, then 2.
Chc of wetting rain.50 percent.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.
Mixing height.......Increasing to 4000-5000 FT AGL.
Transport winds.....Southwest around 15 mph.
Smoke dispersal.....Becoming Fair after 1000.  Becoming Good
                    after 1300.


.FORECAST DAYS 3 THROUGH 5...

.WEDNESDAY NIGHT...
Mostly cloudy. Isolated showers or thunderstorms until sunset.
Lows around 40. Winds generally less than 10 mph.

.THURSDAY...
Partly cloudy. Highs in the mid 60s. South to southwest
winds generally around 10 mph in the afternoon.

.FRIDAY...
Partly cloudy. Lows in the lower 40s. Highs in the upper 60s.
Winds generally less than 10 mph.

.SATURDAY...
Partly cloudy with slight chance of showers and thunderstorms.
Lows in the lower 40s. Highs around 70.
South winds generally less than 10 mph.


$$
Forecaster...Ross
Requested by...Heather McDonald
Type of request...PRESCRIBED
.TAG 1810440.0/RIW
.EMAIL grte_dispatch@nps.gov



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