FNUS75 KBYZ 200228
FWSBYZ

SPOT FORECAST FOR DUDLEY CREEK...USDA FOREST SERVICE
NATIONAL WEATHER SERVICE BILLINGS MT
828 PM MDT SUN APR 19 2009

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON APRIL 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
HIGH PRESSURE ALOFT WILL KEEP DRY AND WARM CONDITIONS FOR MONDAY
AND TUESDAY. WINDS AT RIDGETOP LEVEL WILL BE GUSTY OUT OF THE
WEST TO NORTHWEST...BUT TOWARD THE LOWER VALLEY WINDS WILL BE
SLOPE DOMINANT FROM 5 TO 10 MPH . THERE MAY BE A FEW BRIEF
ERRATIC THERMAL WIND GUSTS FROM 15 TO 20 MPH IN THE AFTERNOON. RH
VALUES WILL DROP INTO THE MID TO UPPER TEENS BY AROUND NOON.
MIXING HEIGHTS WILL BE WELL ABOVE MOUNTAIN TOP LEVEL BY MID DAY.
MOSTLY CLEAR SKIES MONDAY NIGHT WITH VALLEY INVERSION FORMING AS
LIGHT DOWN SLOPE/VALLEY WINDS KICK IN AROUND MID EVENING. USED
THE KARST DOT OBSERVATIONS FOR WIND/TEMP/RH TRENDS. CHAMBERS

.MONDAY...

SKY/WEATHER.........PARTLY CLOUDY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....58-62.
MIN HUMIDITY........15-20 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......BECOMING UP SLOPE/VALLEY 6 TO 10 MPH AROUND 10 AM.
                    EXPECT OCCASIONAL BRIEF THERMAL WIND GUSTS FROM 15
                    TO 20 MPH FROM ERRATIC DIRECTIONS IN THE AFTERNOON
 RIDGETOP...........WEST 20 TO 30 MPH.
MIXING HEIGHT.......12300 FT AGL.
MIXING WINDS........WEST 15 TO 25 MPH.

.MONDAY NIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
MIN TEMPERATURE.....29-33.
MAX HUMIDITY........82-88 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......BECOMING DOWN SLOPE/VALLEY 3 TO 6 MPH AROUND 8 PM.
 RIDGETOP...........NORTHWEST 15 TO 25 MPH.
MIXING HEIGHT.......1300 FT AGL.
MIXING WINDS........SOUTH 8 TO 12 MPH.

$$
FORECASTER...CHAMBERS
REQUESTED BY...ANNA ANDERSON
TYPE OF REQUEST...PRESCRIBED
.TAG 20090420.DUDLE.02/BYZ