FNUS75 KBYZ 041149
FWSBYZ

SPOT FORECAST FOR ANTELOPE UNIT...BIGHORN NATIONAL FOREST
NATIONAL WEATHER SERVICE BILLINGS MT
549 AM MDT SAT SEP 4 2010

FORECAST IS BASED ON IGNITION TIME OF 1200 MDT ON SEPTEMBER 04.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
AN UPPER RIDGE OF HIGH PRESSURE WILL BRING HOT AND DRY CONDITIONS
ALONG WITH HUMIDITIES IN THE LOWER 20 PERCENT RANGE TODAY. THE
UPPER RIDGE WILL BREAK DOWN BY LATE THIS AFTERNOON AS A STRONG
UPPER LEVEL TROUGH OF LOW PRESSURE MOVES IN FROM THE WEST. THIS
WILL BRING ISOLATED SHOWERS AND THUNDERSTORMS TO THE BURN SITE
TONIGHT. THE UPPER TROUGH WILL MOVE OVER THE AREA SUNDAY AND WILL
BRING MUCH COOLER TEMPERATURES ALONG WITH HIGHER MINIMUM RH
VALUES AND INCREASING CHANCE FOR SHOWERS AND THUNDERSTORMS.
TEMPERATURES WILL BE COLD SUNDAY NIGHT AND SNOW WILL BE POSSIBLE.

.TODAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....65-70.
MIN HUMIDITY........20-26 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTH WINDS 5 TO 10 MPH IN THE MORNING SHIFTING
                    TO THE WEST IN THE AFTERNOON.
 RIDGETOP...........WEST 5 TO 15 MPH.
MIXING HEIGHT.......7900 FT AGL.
MIXING WINDS........WEST 15 TO 25 MPH.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY. ISOLATED SHOWERS AND
                    THUNDERSTORMS OVERNIGHT.
CWR.................9 PERCENT.
LAL.................2...1 TO 8 STRIKES/15 MIN/CELL.
MIN TEMPERATURE.....44-49.
MAX HUMIDITY........49-54 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 5 TO 15 MPH. GUSTY AND ERRATIC WINDS
                    EXPECTED NEAR THUNDERSTORMS OVERNIGHT.
 RIDGETOP...........WEST 20 TO 35 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........WEST 10 TO 20 MPH.

.SUNDAY...

SKY/WEATHER.........PARTLY SUNNY. ISOLATED SHOWERS AND
                    THUNDERSTORMS IN THE MORNING...THEN SCATTERED
                    RAIN SHOWERS AND ISOLATED THUNDERSTORMS IN THE
                    AFTERNOON.
CWR.................18 PERCENT.
LAL.................2...1 TO 8 STRIKES/15 MIN/CELL.
MAX TEMPERATURE.....52-57.
MIN HUMIDITY........35-40 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 5 TO 10 MPH. GUSTY AND ERRATIC WINDS
                    EXPECTED NEAR THUNDERSTORMS.
 RIDGETOP...........WEST 15 TO 30 MPH.
MIXING HEIGHT.......6400 FT AGL.
MIXING WINDS........WEST 15 TO 25 MPH.

$$
FORECASTER...RICHMOND
REQUESTED BY...CURTIS RASMUSON
TYPE OF REQUEST...PRESCRIBED
.TAG 20100904.ANTEL.02/BYZ