FNUS75 KBYZ 101458
FWSBYZ

SPOT FORECAST FOR SARPY CREEK...NORTHEN CHEYENNE
NATIONAL WEATHER SERVICE BILLINGS MT
858 AM MDT THU SEP 10 2009

FORECAST IS BASED ON REQUEST TIME OF 0833 MDT ON SEPTEMBER 10.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

...RED FLAG WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 10 PM
MDT THIS EVENING DUE TO COLD FRONTAL PASSAGE...

.DISCUSSION...
A COLD FRONT WILL PUSH INTO THE WILDFIRE SITE BY LATE THIS
AFTERNOON OR EARLY EVENING...BRINGING A WIND SHIFT DURING THE
PERIOD OF LOWEST HUMIDITY. WINDS WILL REMAIN IN THE 10 TO 20 MPH
RANGE WITH GUSTS TO 30 MPH FOR SEVERAL HOURS AFTER THE FRONTAL
PASSAGE. CONDITIONS WILL BE UNSEASONABLY WARM AND DRY
TODAY...WITH HIGHS IN THE MID 80S AND RH VALUES FALLING INTO THE
TEENS AGAIN TODAY. WINDS WILL PICK UP THROUGH THE DAY...REMAINING
LIGHT SOUTHWESTERLY UNTIL EARLY AFTERNOON WHEN WINDS WILL BECOME
NORTHWESTERLY AT 10 TO 15 MPH. HUMIDITY VALUES WILL BE SLOW TO
RECOVER OVERNIGHT...BUT SHOULD REACH THE 70 PERCENT RANGE AS
TEMPERATURES COOL BEHIND THE COLD FRONT. NO THUNDERSTORMS ARE
EXPECTED AT THIS TIME OVER THE WILDFIRE SITE. TEMPERATURES ARE
EXPECTED TO BE MUCH COOLER TOMORROW WITH HIGHS IN THE 70S...AND
RH VALUES WILL BE HIGHER...WITH MINIMUMS IN THE 30 PERCENT RANGE.


.TODAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....78-83.
MIN HUMIDITY........14-19 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 10 MPH IN THE MORNING
                    SHIFTING TO THE NORTHWEST 10 TO 20 MPH WITH
     GUSTS TO 30 MPH IN THE LATE AFTERNOON.
 RIDGETOP...........WEST 5 TO 10 MPH.
MIXING HEIGHT.......8800 FT AGL.
MIXING WINDS........WEST 10 TO 20 MPH.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....47-52.
MAX HUMIDITY........66-71 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTH WINDS 10 TO 20 MPH WITH GUSTS TO 30
    MPH MAINLY IN THE LATE EVENING.
 RIDGETOP...........NORTH 15 TO 30 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........NORTH 15 TO 30 MPH.

.FRIDAY...

SKY/WEATHER.........PARTLY CLOUDY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....65-70.
MIN HUMIDITY........36-41 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTHWEST WINDS 5 TO 15 MPH.
 RIDGETOP...........NORTH 10 TO 20 MPH.
MIXING HEIGHT.......5200 FT AGL.
MIXING WINDS........NORTH 10 TO 20 MPH.

$$
FORECASTER...GILSTAD/BORSUM
REQUESTED BY...LEE OLD BEAR
TYPE OF REQUEST...WILDFIRE
.TAG 20090910.SARPY.01/BYZ