FNUS75 KBYZ 251403
FWSBYZ

SPOT FORECAST FOR MAIN BOULDER UNIT 7 RX...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
803 AM MDT WED APR 25 2012

FORECAST IS BASED ON IGNITION TIME OF 0750 MDT ON APRIL 25.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

BIGGEST CHANGE TODAY IS THUNDERSTORM ACTIVITY SHOULD NOT IMPACT
THE BURN SITE UNTIL LATE AFTERNOON...AFTER 1800. ANY STORMS THAT
DEVELOP WILL APPROACH THE BURN SITE FROM THE SOUTH...SO STRONGER
DOWN VALLEY WINDS THIS EVENING COULD BE POSSIBLE. EXPECT A SUNNY
START BUT WINDS WILL REMAIN DOWNVALLEY DUE TO SURFACE LOW
PRESSURE OVER CENTRAL MONTANA BUT THEY WILL BE LIGHTER THIS
AFTERNOON THAN TUESDAY. TEMPERATURES AND HUMIDITY THIS AFTERNOON WILL
BE SIMILAR TO TUESDAY. EXPECT CLOUD COVER TO INCREASE AFTER 1400 WITH
WITH CUMULUS FORMING OVER THE MOUNTAINS.

BIGGER PICTURE...STRONGER DISTURBANCE WILL MOVE OVER THE BURN SITE
TONIGHT BRINGING A BETTER CHANCE FOR RAIN SHOWERS AND
THUNDERSTORMS. EXPECT COOLER TEMPERATURES AND HIGHER HUMIDITY ON
THURSDAY...WITH A CONTINUED CHANCE FOR SHOWERS AND THUNDERSTORMS.

.TODAY...

SKY/WEATHER.........MOSTLY SUNNY THIS MORNING INCREASING AFTERNOON
                    CUMULUS.
CWR.................ZERO.
LAL.................1...NONE.
MAX TEMPERATURE.....76-80.
MIN HUMIDITY........20-25 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTH WINDS 5 TO 10 MPH. GUSTY AND ERRATIC WINDS
                    EXPECTED NEAR THUNDERSTORMS AFTER 1700.
 RIDGETOP...........SOUTHWEST 5 TO 15 MPH.
MIXING HEIGHT.......9000 FT AGL.
MIXING WINDS........WEST 5 TO 15 MPH.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY. SCATTERED SHOWERS AND
                    THUNDERSTORMS.
CWR.................30 PERCENT.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MIN TEMPERATURE.....43-48.
MAX HUMIDITY........76-81 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST 10 TO 15 MPH WITH SOME GUSTS TO 30
                    MPH AFTER 2000. GUSTY AND ERRATIC WINDS
                    EXPECTED NEAR THUNDERSTORMS.
 RIDGETOP...........SOUTHWEST 15 TO 25 MPH.
MIXING HEIGHT.......1300 FT AGL.
MIXING WINDS........SOUTH 15 TO 25 MPH.

.THURSDAY...

SKY/WEATHER.........CLOUDY. SCATTERED RAIN SHOWERS AND ISOLATED
                    THUNDERSTORMS IN THE MORNING...THEN NUMEROUS
                    SHOWERS AND THUNDERSTORMS LIKELY IN THE
                    AFTERNOON.
CWR.................50 PERCENT.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MAX TEMPERATURE.....61-66.
MIN HUMIDITY........38-43 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 15 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS.
 RIDGETOP...........SOUTH 10 TO 20 MPH.
MIXING HEIGHT.......5800 FT AGL.
MIXING WINDS........SOUTH 15 TO 30 MPH.

$$
FORECASTER...BORSUM
REQUESTED BY...GREG JUVAN
TYPE OF REQUEST...PRESCRIBED
.TAG 20120425.MAINB.01/BYZ