FNUS75 KBYZ 082017
FWSBYZ

SPOT FORECAST FOR MAIN BOULDER 8A...USDA FOREST SERVICE GALLATIN NATIONAL FOREST
NATIONAL WEATHER SERVICE BILLINGS MT
217 PM MDT WED MAY 8 2013

FORECAST IS BASED ON IGNITION TIME OF 1355 MDT ON MAY 08.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
WINDS MAY VARY IN DIRECTION AT TIMES UNTIL SUNSET DUE TO LIGHT
SHOWER ACTIVITY OVER THE SURROUNDING HIGH TERRAIN. OTHERWISE...
SLOPE AND VALLEY WINDS WILL PERSIST THIS AFTERNOON AND TONIGHT...
WITH MOSTLY DRY WEATHER. ON THURSDAY...LOOK FOR INCREASING CHANCES
OF SHOWERS AND THUNDERSTORMS BY AFTERNOON. SHOWER ACTIVITY ON
THURSDAY MAY CAUSE ERRATIC WIND GUSTS AT THE BURN SITE.

.REST OF TODAY...

SKY/WEATHER.........PARTLY SUNNY. ISOLATED LIGHT SHOWERS.
CWR.................LESS THAN 10 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....68-71.
MIN HUMIDITY........18-20 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTH/UPCANYON 5-15 MPH. WINDS MAY BE VARIABLE
                    IN DIRECTION DUE TO LIGHT DOWNDRAFTS OVER THE
                    MOUNTAINS.
 RIDGETOP...........NORTHEAST 10 MPH.
MIXING HEIGHT.......6500 FT AGL.
MIXING WINDS........NORTHEAST 10 MPH.
HAINES INDEX........3.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY. ISOLATED EVENING SHOWERS.
CWR.................LESS THAN 10 PERCENT.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MIN TEMPERATURE.....36-41.
MAX HUMIDITY........65-75 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTH/UPCANYON 5-15 MPH BECOMING SOUTH/
                    DOWNCANYON 5-10 MPH AFTER SUNSET. ERRATIC
                    WINDS TO 15 MPH POSSIBLE UNTIL SUNSET.
 RIDGETOP...........NORTH TO NORTHEAST 5-10 MPH.
MIXING HEIGHT.......1000 FT AGL.
MIXING WINDS........NORTHEAST 10 MPH BECOMING SOUTH.
HAINES INDEX........4.

.THURSDAY...

SKY/WEATHER.........MOSTLY SUNNY IN THE MORNING...THEN INCREASING
                    CLOUDS WITH SCATTERED SHOWERS AND
                    THUNDERSTORMS IN THE AFTERNOON.
CWR.................20 PERCENT.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MAX TEMPERATURE.....69-72.
MIN HUMIDITY........23-28 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTH 5-10 MPH EARLY BECOMING UPCANYON 5-15
                    MPH BY LATE MORNING. GUSTY AND ERRATIC WINDS
                    POSSIBLE NEAR SHOWER ACTIVITY IN THE
                    AFTERNOON.
 RIDGETOP...........NORTH 10 MPH.
MIXING HEIGHT.......7000 FT AGL.
MIXING WINDS........NORTH 10 MPH.
HAINES INDEX........4.

$$
FORECASTER...LESTER
REQUESTED BY...CRISTI HEANEY
TYPE OF REQUEST...PRESCRIBED
.TAG 20130508.MAINB.01/BYZ