FNUS75 KBYZ 221420
FWSBYZ

SPOT FORECAST FOR MAIN BOULDER...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
820 AM MDT WED APR 22 2009

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON APRIL 22.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

WESTERLY FLOW ALOFT WILL BRING ANOTHER WARM...DRY AND BREEZY DAY
TO THE BURN SITE...WITH TEMPS TO AROUND 75 DEGREES AND RH READINGS
DROPPING INTO THE LOWER TEENS OR SINGLE DIGITS AGAIN TODAY. LIGHT
DRAINAGE WINDS FROM THE SOUTH AND EAST WILL BE COMMON EARLY IN THE
MORNING WITH OCCASIONAL WEST WINDS. BY MIDDAY WINDS WILL BECOME WEST AND
NORTHWEST...AND INCREASE SLIGHTLY WITH GUSTS AROUND 20 MPH. THERE WILL
BE A VERY SLIGHT CHANCE OF A SHOWER OR THUNDERSHOWER IN THE AFTERNOON
PRODUCING ERRATIC GUSTY WINDS. THE CHANCE OF SHOWERS WILL
INCREASE TONIGHT INTO THURSDAY. A COLD FRONT IS EXPECTED TO
MOVE THROUGH THE AREA EARLY THURSDAY AND TURN WINDS NORTHEAST WITH
COOLER TEMPS AND MUCH HIGHER RH READINGS FOR THURSDAY AFTERNOON.


.TODAY...

SKY/WEATHER.........PARTLY CLOUDY. ISOLATED SHOWERS AND
                    THUNDERSTORMS IN THE AFTERNOON.
CWR.................10 PERCENT.
MAX TEMPERATURE.....73-78.
MIN HUMIDITY........10-15 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 5 TO 15 MPH IN THE MORNING
                    INCREASING TO 15 TO 25 MPH IN THE AFTERNOON.
                    GUSTY AND ERRATIC WINDS EXPECTED NEAR
                    THUNDERSTORMS IN THE AFTERNOON.
MIXING HEIGHT.......6500 FT AGL.
MIXING WINDS........WEST 25 TO 40 MPH.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY. ISOLATED SHOWERS AND
                    THUNDERSTORMS IN THE EVENING...THEN SCATTERED
                    RAIN SHOWERS AND SNOW SHOWERS OVERNIGHT.
CWR.................16 PERCENT.
MIN TEMPERATURE.....31-36.
MAX HUMIDITY........72-77 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 15 TO 25 MPH. GUSTS UP TO 30 MPH IN
                    THE EVENING. GUSTY AND ERRATIC WINDS EXPECTED
                    NEAR THUNDERSTORMS IN THE EVENING.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........SOUTHWEST 35 TO 50 MPH.

.THURSDAY...

SKY/WEATHER.........MOSTLY CLOUDY. SCATTERED RAIN SHOWERS AND SNOW
                    SHOWERS IN THE MORNING...THEN RAIN AND SNOW
                    LIKELY IN THE AFTERNOON.
CWR.................34 PERCENT.
MAX TEMPERATURE.....36-41.
MIN HUMIDITY........47-52 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 15 TO 25 MPH.
MIXING HEIGHT.......1900 FT AGL.
MIXING WINDS........SOUTHWEST 35 TO 50 MPH.

$$
FORECASTER...GILSTAD/HOOLEY
REQUESTED BY...ASHLEY SITES
TYPE OF REQUEST...PRESCRIBED
.TAG 20090422.MAINB.03/BYZ