FNUS75 KBYZ 181122
FWSBYZ

SPOT FORECAST FOR GILEAD...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
522 AM MDT TUE SEP 18 2012

FORECAST IS BASED ON REQUEST TIME OF 0506 MDT ON SEPTEMBER 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A FAST NORTHWEST FLOW OF AIR AT RIDGTOP LEVEL WILL BE OVER THE
AREA TODAY AND WEDNESDAY. SOME OF THESE NORTHWEST WINDS WILL TRY
TO MIX DOWN TO THE SURFACE AND CREATE SOME GUSTS TO 20 MPH. THE
STRONGEST WINDS WILL BE AT RIDGETOP LEVEL. BELIEVE THE SURFACE
PRESSURE GRADIENT TODAY SHOULD MINIMIZE THE UPSLOPE COMPONENT TO A
CERTAIN DEGREE BUT DO EXPECT DIURNAL WIND INFLUENCES THIS
AFTERNOON AT TIME OF PEAK HEATING. HUMIDITY WILL FALL INTO THE
TEENS THIS AFTERNOON. A COLD FRONT WILL PUSH THROUGH TONIGHT AND
PROVIDE GUSTY NORTHWEST WINDS. WEDNESDAY WILL BE COOLER AND WINDS
WILL BE MAINLY DRIVEN BY TERRAIN. SOME WIND GUSTS CAN ALSO BE
EXPECTED WEDNESDAY AS SOME OF THE STRONGER WINDS ALOFT TRY TO MIX
DOWN AGAIN. TWH


.TODAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....71-76.
MIN HUMIDITY........17-22 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTHWEST WINDS 8 TO 16 MPH GUSTS TO 20 MPH.
 RIDGETOP...........NORTHWEST 15 TO 30 MPH.
MIXING HEIGHT.......5900 FT AGL.
MIXING WINDS........NORTHWEST 15 TO 25 MPH.
HAINES INDEX........4.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....42-47.
MAX HUMIDITY........30-35 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTHWEST WINDS 8 TO 16 MPH GUSTS TO 20 MPH.
 RIDGETOP...........NORTHWEST 20 TO 35 MPH.
MIXING HEIGHT.......900 FT AGL.
MIXING WINDS........NORTHWEST 15 TO 25 MPH.
HAINES INDEX........4.

.WEDNESDAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....66-71.
MIN HUMIDITY........20-25 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTHWEST WINDS 8 TO 16 MPH GUSTS TO 20 MPH
                    IN THE MORNING. WINDS TURNING MORE TO THE
                    NORTHEAST BY LATE MORNING.
 RIDGETOP...........NORTHWEST 15 TO 30 MPH.
MIXING HEIGHT.......4700 FT AGL.
MIXING WINDS........NORTH 15 TO 25 MPH.
HAINES INDEX........4.

$$
FORECASTER...HUMPHREY
REQUESTED BY...GALEN ROESLER
TYPE OF REQUEST...WILDFIRE
.TAG 20120918.GILEA.01/BYZ