Suppression Forecast
Issued by NWS Billings, MT

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000
FNUS75 KBYZ 211119
FWSBYZ

SPOT FORECAST FOR MAIN BOULDER STATION...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
519 AM MDT TUE APR 21 2015

FORECAST IS BASED ON IGNITION TIME OF 0525 MDT ON APRIL 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A WEAK COOL FRONT APPROACHING FROM THE EAST WILL MOVE THROUGH THE
BURN SITE DURING THE MID MORNING HOURS. IT WILL HAVE A MINIMAL
IMPACT ON WINDS AT THE BURN SITE SINCE IT WILL ALIGN WITH UPSLOPE
FLOWS AND ONLY INCREASE THEM BY 1 OR 2 MPH. CUMULUS CLOUDS WILL
DEVELOP OVER THE BURN SITE BY EARLY AFTERNOON BUT SHOWER ACTIVITY
IS EXPECTED TO STAY SOUTH OF THE BURN SITE. DESPITE A WARMER AND
DRIER START THIS MORNING THE FRONTAL PASSAGE WILL KEEP HUMIDITY
MINIMUMS THIS AFTERNOON AROUND 25 PERCENT.

EXPECT BETTER HUMIDITY RECOVERY OVERNIGHT WITH SLIGHTLY COOLER
TEMPERATURES. WEDNESDAY WILL BE WARMER WITH ISOLATED AFTERNOON
SHOWERS EXPECTED TO FAVOR THE HIGHER PEAKS SOUTH AND WEST OF
THE BURN SITE. WINDS WILL CONTINUE TO BE LIGHT AND DRIVEN BY
LOCAL UPSLOPE AND UPVALLEY WINDS. BORSUM

.TODAY...

SKY/WEATHER.........MOSTLY SUNNY IN THE MORNING...PARTLY CLOUDY
                    IN THE AFTERNOON. ISOLATED RAIN SHOWERS IN THE
                    AFTERNOON MAINLY TO THE SOUTH OF THE BURN AREA.
CWR.................5 PERCENT.
MAX TEMPERATURE.....54-59.
MIN HUMIDITY........24-29 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......UPSLOPE 7 TO 10 GUSTS TO 12 MPH.
MIXING HEIGHT.......6700 FT AGL.
MIXING WINDS........WEST 5 TO 10 MPH.
HAINES INDEX........3.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY. ISOLATED RAIN SHOWERS IN THE
                    EVENING MAINLY TO THE SOUTH OF THE BURN SITE.
CWR.................5 PERCENT.
MIN TEMPERATURE.....34-39.
MAX HUMIDITY........68-73 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNSLOPE/DOWNVALLEY 4 TO 6 MPH.
MIXING HEIGHT.......400 FT AGL.
MIXING WINDS........SOUTH 5 TO 10 MPH.
HAINES INDEX........3.

.WEDNESDAY...

SKY/WEATHER.........MOSTLY SUNNY. ISOLATED RAIN SHOWERS IN THE
                    AFTERNOON SOUTH AND WEST OF BURN SITE.
CWR.................10 PERCENT.
MAX TEMPERATURE.....63-68.
MIN HUMIDITY........23-28 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......UPSLOPE 7 TO 10 MPH.
MIXING HEIGHT.......7700 FT AGL.
MIXING WINDS........WEST 5 TO 15 MPH.
HAINES INDEX........3.

$$
FORECASTER...BORSUM
REQUESTED BY...MEGAN MARTINEZ
TYPE OF REQUEST...PRESCRIBED
.TAG 20150421.MAINB.02/BYZ



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