FNAK79 PAFG 240411
FWSAFG

SPOT FORECAST FOR ROCK SLOUGH  347...BLM/ALASKA FIRE SERVICE UYTD
NATIONAL WEATHER SERVICE FAIRBANKS AK
811 PM AKDT THU JUL 23 2009

FORECAST IS BASED ON REQUEST TIME OF 1931 AKDT ON JULY 23.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
THIS EVENING A THERMAL TROUGH EXTENDS FROM THE BETTLES AREA
TO FORT YUKON AND EAST TO THE CANADA BORDER. THE THERMAL
TROUGH IS FORECAST TO MOVE SLOWLY NORTHWARD LATE AND FRIDAY
TO BE LOCATED ALONG THE BROOKS RANGE BY FRIDAY AFTERNOON.
THIS SHIFT IN THE POSITION OF THE THERMAL TROUGH WILL
RESULT IN A CHANGE IN THE PREVAILING WIND DIRECTION
OVER THE FIRE AREA. WINDS ARE EXPECTED TO BE LIGHT AND
VARIABLE TONIGHT BECOMING SOUTHWEST 6-10 MPH FRIDAY
AFTERNOON. A MODERATELY UNSTABLE AIR MASS WILL REMAIN
OVER THE AREA THROUGH FRIDAY AFTERNOON.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT) BECOMING PARTLY
                    CLOUDY (40-50 PERCENT) AFTER 0200. ISOLATED
                    THUNDERSTORMS POSSIBLE UNTIL 2300. ISOLATED
                    SHOWERS FOR THE REMAINDER OF THE NIGHT.
MIN TEMPERATURE.....AROUND 50.
MAX HUMIDITY........78 PERCENT.
WIND (20 FT)........VARIABLE 0-4 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS UNTIL 2300.
CWR.................10
LAL.................2.
MIXING HEIGHT.......5000-6000 FT AGL LOWERING TO 600-800 FT AGL
                    BY 0200.
MIXING WINDS........SOUTH 5-15 MPH BECOMING VARIABLE 0-5 MPH
                    BY 0200.

.FRIDAY...

SKY/WEATHER.........PARTLY CLOUDY (50-60 PERCENT). AREAS OF SMOKE.
                    ISOLATED THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 73.
MIN HUMIDITY........33 PERCENT.
WIND (20 FT)........SOUTHWEST 1-4 MPH IN THE MORNING INCREASING
                    TO 6-10 MPH AFTER 1300.
CWR.................10.
LAL.................2.
MIXING HEIGHT.......800-1000 FT AGL IN THE EARLY MORNING RISING
                    TO 5000-6000 FT AGL BY EARLY AFTERNOON.
MIXING WINDS........SOUTHWEST 1-4 MPH IN THE MORNING BECOMING
                    SOUTH 5-10 MPH IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...
PARTLY CLOUDY. AREAS OF SMOKE. LOWS 50 TO 55. HIGHS 70 TO 75.
SOUTHWEST WINDS 5 TO 10 MPH.
.SUNDAY...
PARTLY CLOUDY. LOWS 50 TO 55. HIGHS NEAR 75.
SOUTHEAST WINDS 5 TO 10 MPH.
.MONDAY...
MOSTLY CLOUDY. LOWS NEAR 55. HIGHS NEAR 80.
SOUTH WINDS TO 10 MPH.
.TUESDAY...
PARTLY CLOUDY. LOWS NEAR 55. HIGHS NEAR 80.
SOUTHWEST WINDS 10 TO 15 MPH.

$$
FORECASTER...FISCHER
REQUESTED BY...LISA ST  CLAIR
TYPE OF REQUEST...WILDFIRE
.TAG 20090723.ROCKS.01/AFG