FNUS75 KBYZ 211110
FWSBYZ

SPOT FORECAST FOR BATTLE PARK RX...BIGHORN NATIONAL FOREST
NATIONAL WEATHER SERVICE BILLINGS MT
510 AM MDT THU OCT 21 2010

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON OCTOBER 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

A PUSH OF DRY AIR HAS MOVED INTO THE BIG HORN MOUNTAINS THIS
MORNING...WITH RELATIVE HUMIDITIES ALREADY IN THE TEENS AND 20S.
EXPECT RELATIVE HUMIDITIES TO HOLD IN THIS RANGE THROUGH THE DAY
TODAY WITH MARGINAL INCREASES TONIGHT. EXPECT SIMILAR RH TREND
FOR FRIDAY. WINDS WILL BE LIGHT AND SLOPE DOMINANT TODAY THROUGH
FRIDAY. A STORM SYSTEM WILL BEGIN TO IMPACT THE FIRE AREA LATE
SATURDAY WITH INCREASING PRECIPITATION CHANCES AND STRONGER
SOUTHWEST WINDS. A STRONG COLD FRONT WITH VERY GUSTY WEST TO
NORTHWEST WINDS AND GOOD WETTING RAIN/SNOW CHANCES ARRIVES LATE
SUNDAY. CHAMBERS


.TODAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....55-60.
MIN HUMIDITY........17-22 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWN SLOPE/VALLEY 4 TO 8 MPH IN THE MORNING
                    ...BECOMING UP SLOPE/VALLEY 6 TO 12 MPH IN
                    THE AFTERNOON.
 RIDGETOP...........SOUTHWEST 5 TO 10 MPH.
MIXING HEIGHT.......3100 FT AGL.
MIXING WINDS........WEST 5 TO 10 MPH.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....39-44.
MAX HUMIDITY........42-48 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......UP SLOPE/VALLEY 5 TO 10 MPH IN THE EVENING
                    ...BECOMING DOWN SLOPE/VALLEY 4 TO 8 MPH LATE.
 RIDGETOP...........SOUTHWEST 5 TO 10 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........SOUTHWEST 5 TO 10 MPH.

.FRIDAY...

SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....46-51.
MIN HUMIDITY........18-23 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWN SLOPE/VALLEY 4 TO 8 MPH IN THE MORNING
                    ...BECOMING UP SLOPE/VALLEY 6 TO 12 MPH IN
                    THE AFTERNOON.
 RIDGETOP...........SOUTHWEST 5 TO 10 MPH.
MIXING HEIGHT.......4000 FT AGL.
MIXING WINDS........SOUTHWEST 10 TO 15 MPH.

$$
FORECASTER...CHAMBERS
REQUESTED BY...CURTIS RASMUSON
TYPE OF REQUEST...PRESCRIBED
.TAG 20101021.BATTL.01/BYZ