FNUS75 KRIW 181245
FWSRIW

SPOT FORECAST FOR BEARTOOTH FACE...USFS SHF
NATIONAL WEATHER SERVICE RIVERTON WY
645 AM MDT FRI SEP 18 2009

FORECAST IS BASED ON IGNITION TIME OF 0655 MDT ON SEPTEMBER 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
HIGH PRESSURE ALOFT TODAY WILL PRODUCE LIGHT...TERRAIN DRIVEN
WINDS AND HIGH TEMPERATURES WELL ABOVE NORMAL WITH LOW MINIMUM RELATIVE
HUMIDITIES TODAY. THE UPPER LEVEL HIGH WILL SHIFT SOUTHWARD SATURDAY...
AS A STRONG LOW PRESSURE SYSTEM MOVES ACROSS THE PACIFIC NORTHWEST.
IT WILL REMAIN DRY AND UNSEASONABLY WARM SATURDAY. WINDS WILL BE LIGHT
AND TERRAIN DRIVEN AGAIN ON SATURDAY.

...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS...
...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT...

FORECASTER...C.BAKER

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....80-84.
MIN HUMIDITY........18-20 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH.
RIDGE TOP WINDS.....NORTH AROUND 8 MPH SHIFTING TO THE NORTHEAST IN
                    THE AFTERNOON.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3200 FT AGL INCREASING TO 9000 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....NORTH AROUND 8 MPH SHIFTING TO THE NORTHEAST 9
                    TO 10 MPH IN THE AFTERNOON.
SMOKE DISPERSAL.....BECOMING GOOD BY 11 AM MDT (90000 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).
MIN TEMPERATURE.....56-58.
MAX HUMIDITY........40-45 PERCENT.
20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 4-7 MPH.
RIDGE TOP WINDS.....EAST AROUND 10 MPH SHIFTING TO THE SOUTH LATE
                    IN THE EVENING...THEN SHIFTING TO THE WEST
                    AFTER MIDNIGHT.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......DECREASING TO 1000 FT AGL BY 10 PM MDT.
TRANSPORT WINDS.....EAST AROUND 9 MPH SHIFTING TO THE SOUTH LATE IN
                    THE EVENING...THEN SHIFTING TO THE WEST 8 TO 9
                    MPH AFTER MIDNIGHT.
SMOKE DISPERSAL.....BECOMING POOR  BY 9 PM MDT(4700-15700 KNOT-FT).

.SATURDAY...
SKY/WEATHER.........SUNNY (5-15 PERCENT) THEN BECOMING PARTLY
                    CLOUDY (40-45 PERCENT). SLIGHT CHANCE OF
                    SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....81-84.
MIN HUMIDITY........15-18 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTHWEST
                    AROUND 10 MPH LATE IN THE AFTERNOON. GUSTY AND
                    ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN
                    THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST 10 TO 15 MPH.
LAL.................1 UNTIL 1200...THEN 2.
CHC OF WETTING RAIN.5 PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......6200 FT AGL INCREASING TO 11500 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 10 TO 16 MPH.
SMOKE DISPERSAL.....FAIR (55300 KNOT-FT) INCREASING TO VERY GOOD
                    (137300 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY NIGHT...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE MID 50S. WINDS GENERALLY LESS THAN
10 MPH.
.SUNDAY...MUCH COOLER. MOSTLY CLOUDY WITH CHANCE OF SHOWERS...
THUNDERSTORMS AND SLIGHT CHANCE OF SNOW SHOWERS. LOWS IN THE
MID 40S. HIGHS AROUND 60. WINDS GENERALLY LESS THAN 10 MPH.
.MONDAY...MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE LOWER
60S. WINDS GENERALLY LESS THAN 10 MPH.
.TUESDAY...MOSTLY CLEAR. LOWS IN THE MID 40S. HIGHS IN THE LOWER
70S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...C.BAKER
REQUESTED BY...CLINT DAWSON
REASON FOR REQUEST...PRESCRIBED
.TAG 20090918.BEART.01/RIW