FNUS75 KBYZ 270150
FWSBYZ

SPOT FORECAST FOR BRIDGER CANYON FIRE...PARK COUNTY SHERIFFS OFFICE
NATIONAL WEATHER SERVICE BILLINGS MT
750 PM MDT SAT SEP 26 2009

FORECAST IS BASED ON IGNITION TIME OF 1945 MDT ON SEPTEMBER 26.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

...RED FLAG WARNING IN EFFECT UNTIL MIDNIGHT MDT TONIGHT...

.DISCUSSION...
IT WILL BE DRY WITH WINDY CONDITIONS EARLY THIS EVENING AHEAD OF
A COLD FRONT THAT WILL APPROACH THE FIRE SITE EARLY SUNDAY MORNING.
A RED FLAG WARNING IS IN EFFECT FOR THE SITE UNTIL MIDNIGHT MDT
TONIGHT DUE TO THE ABOVE NORMAL TEMPERATURES...DRY CONDITIONS AND
GUSTY NORTHWEST WINDS. WINDS WILL BE NORTHWEST 15 TO 25 MPH EARLY THIS
EVENING...THEN WILL DECREASE TO DOWNSLOPE/DOWN VALLEY 5 TO 10 MPH
BY LATE THIS EVENING. RELATIVE HUMIDITIES WILL RECOVER INTO THE 50S
OVERNIGHT. THE COLD FRONT WILL PUSH SOUTH ACROSS THE FIRE SITE
SUNDAY MORNING ALLOWING WINDS TO BECOME NORTHWEST 5 TO 15 MPH. IT WILL
BE MUCH COOLER THAN IT WAS TODAY AND RELATIVE HUMIDITIES WILL BE 20 TO 25
PERCENT. HIGH PRESSURE WILL BRING COLD WEATHER TO THE SITE SUNDAY
NIGHT WITH NORTHWEST WINDS 5 TO 10 MPH BECOMING SOUTHEAST OVERNIGHT.
HUMIDITIES WILL BE IN THE UPPER 50S TO LOWER 60S.

.REST OF TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
MIN TEMPERATURE.....43-48.
MAX HUMIDITY........53-58 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTHWEST WINDS 15 TO 25 MPH EARLY...DECREASING TO
                    DOWNSLOPE/DOWN VALLEY 5 TO 10 MPH BY LATE EVENING.
 RIDGETOP...........NORTHWEST 20 TO 30 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........WEST 30 TO 45 MPH.

.SUNDAY...

SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....60-65.
MIN HUMIDITY........20-25 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNSLOPE/DOWN VALLEY WINDS 5 TO 10 MPH EARLY...
                    BECOMING NORTHWEST 5 TO 15 MPH BY LATE MORNING.
 RIDGETOP...........NORTHWEST 10 TO 20 MPH.
MIXING HEIGHT.......6700 FT AGL.
MIXING WINDS........NORTHWEST 15 TO 25 MPH.

.SUNDAY NIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
MIN TEMPERATURE.....33-38.
MAX HUMIDITY........58-63 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTHWEST WINDS 5 TO 10 MPH IN THE EVENING SHIFTING
                    TO THE SOUTHEAST OVERNIGHT.
 RIDGETOP...........WEST 5 TO 15 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........WEST 10 TO 20 MPH.

$$
FORECASTER...ARTHUR
REQUESTED BY...SGT TOM TOTLAND
TYPE OF REQUEST...PRESCRIBED
.TAG 20090926.BRIDG.05/BYZ