FNUS75 KBYZ 172053
FWSBYZ

SPOT FORECAST FOR MAIN BOULDER 5B...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
253 PM MDT SUN MAY 17 2009

FORECAST IS BASED ON IGNITION TIME OF 1000 MDT ON MAY 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

ANOTHER WARM DAY IS EXPECTED IN THE BOULDER RIVER VALLEY MONDAY.
WINDS WILL BE LIGHTER THAN TODAY AND SHOULD BE MORE SLOPE
DOMINANT IN THE AFTERNOON. BY LATE AFTERNOON A WEAK COLD FRONT
WILL TRY AND MOVE INTO THE VALLEY...THOUGH THIS SHOULD ONLY
ENHANCE UPSLOPE FLOW SLIGHTLY. ISOLATED THUNDERSTORMS ARE
POSSIBLE AFTER ABOUT 3 PM...WITH GUSTY WINDS THE MAIN THREAT.
RELATIVE HUMIDITIES WILL BE SIMILAR TO SUNDAY...IN THE MID TO
UPPER TEENS.

.MONDAY...

SKY/WEATHER.........PARTLY CLOUDY. ISOLATED LATE AFTERNOON
                    THUNDERSTORMS. GUSTY ERRATIC WINDS NEAR ANY
                    THUNDERSTORMS.
CWR.................20 PERCENT.
LAL.................2...1 TO 8 STRIKES/15 MIN/CELL.
MAX TEMPERATURE.....78-82.
MIN HUMIDITY........16-20 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWN SLOPE/VALLEY 3 TO 8 MPH IN THE MORNING...
                    BECOMING UP SLOPE/VALLEY 8 TO 12 MPH AFTER
                    11 AM.
 RIDGETOP...........WEST 10 TO 20 MPH.
MIXING HEIGHT.......7800 FT AGL.
MIXING WINDS........WEST 15 TO 25 MPH.

$$
FORECASTER...CHAMBERS
REQUESTED BY...GREG JUVAN
TYPE OF REQUEST...PRESCRIBED
.TAG 20090518.MAINB.02/BYZ