FNUS75 KBYZ 161404
FWSBYZ

SPOT FORECAST FOR DRY FORK RX...SWEETGRASS SHERIFF
NATIONAL WEATHER SERVICE BILLINGS MT
804 AM MDT WED SEP 16 2009

FORECAST IS BASED ON IGNITION TIME OF 1000 MDT ON SEPTEMBER 16.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

...WARM AND DRY CONDITIONS THROUGH THE WEEK...

...SOME GUSTY WINDS IN THE AFTERNOON...

.DISCUSSION...
CONDITIONS SHOULD REMAIN WARM AND DRY THROUGH THE WEEK.
HUMIDITIES WILL FALL BELOW 30 PERCENT AND APPROACH THE MID 20S.
WINDS WILL FOLLOW MOSTLY TERRAIN INFLUENCES. SOME GUSTS UP TO 22
MPH CAN BE EXPECTED AS THE ATMOSPHERE MIXES OUT AND COMBINES WITH
PEAK UP CANYON AND UP VALLEY FLOW AS THE GROUND HEATS UP AROUND
NOON TIME. THE WINDS WILL WANT TO TURN DOWN VALLEY TONIGHT BUT
WILL BE BATTLING PRESSURE INFLUENCES TO PULL THE WINDS UP THE
CANYON...SO THE WINDS TONIGHT MAY GET A BIT ERRATIC. DO THINK THE
TERRAIN INFLUENCE WILL EVENTUALLY WIN OUT. THURSDAY SHOULD BE
SIMILAR TO TODAY WITH SOME AFTERNOON GUSTS AS THE CANYON FLOOR
HEATS UP. A WEAK COLD FRONT WILL PUSH INTO THE AREA THURSDAY
NIGHT...AND THIS WILL LIKELY SWITCH THE WINDS TO THE NORTHWEST
OVERNIGHT. HUMPHREY


.TODAY...

SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....69-74.
MIN HUMIDITY........26-31 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTH TO SOUTHWEST 6 TO 14 MPH THIS MORNING.
    WINDS BECOMING MORE SOUTHEAST 8 TO 16 MPH WITH
    SOME GUSTS TO 22 MPH BY NOON.
 RIDGETOP...........SOUTH 15 TO 20 MPH.
MIXING HEIGHT.......5000 FT AGL.
MIXING WINDS........SOUTHEAST 10 TO 20 MPH.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY.
MIN TEMPERATURE.....50-55.
MAX HUMIDITY........60-65 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WINDS TRENDING EAST TO NORTHEAST OR DOWN VALLEY
    6 TO 14 MPH IN THE EARLY EVENING.
 RIDGETOP...........SOUTH 10 TO 15 MPH.
MIXING HEIGHT.......1000 FT AGL.
MIXING WINDS........SOUTH 5 TO 15 MPH.

.THURSDAY...

SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....69-74.
MIN HUMIDITY........26-31 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......EAST TO NORTHEAST EARLY IN THE MORNING TENDING TO
    THE SOUTH TO SOUTHWEST 6 TO 14 MPH BY MID MORNING.
    WINDS BECOMING MORE SOUTHEAST 8 TO 16 MPH WITH SOME
    GUSTS TO 22 BY NOON.
 RIDGETOP...........LIGHT WINDS.
MIXING HEIGHT.......5000 FT AGL.
MIXING WINDS........SOUTHWEST 10 TO 15 MPH.

$$
FORECASTER...HUMPHREY
REQUESTED BY...DAN TRONRUD
TYPE OF REQUEST...PRESCRIBED
.TAG 20090916.DRYFO.02/BYZ