FNUS75 KBYZ 231305
FWSBYZ

SPOT FORECAST FOR BLACK SPRINGS RX PROJECT...NORTHERN CHEYENNE
NATIONAL WEATHER SERVICE BILLINGS MT
705 AM MDT WED SEP 23 2009

FORECAST IS BASED ON IGNITION TIME OF 0900 MDT ON SEPTEMBER 23.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
EXPECT LITTLE CHANGE IN THE WEATHER PATTERN OVER THE BURN SITE
FOR THE NEXT TWO DAYS...AS AN UPPER LEVEL HIGH PRESSURE BUILDS
INTO THE AREA. WARMING AND DRYING CONDITIONS WILL CONTINUE WITH
TEMPERATURES AGAIN WELL ABOVE NORMAL...IN THE 80S...TODAY AND
TOMORROW...AND MINIMUM RH VALUES IN THE TEENS AND LOW 20S RANGE.
OVERNIGHT TEMPERATURES WILL AGAIN DROP INTO THE 40S... ALLOWING
FOR GOOD RH RECOVERY...INTO THE 60 PERCENT RANGE. WINDS OVER THE
AREA SHOULD REMAIN LIGHT NORTHWESTERLY THROUGH THE MORNING...BUT
WILL TURN NORTHEASTERLY THIS AFTERNOON...AND A BIT LIGHTER THAN
YESTERDAY...AROUND 10MPH. WINDS WILL BECOME MORE EASTERLY TO
SOUTHEASTERLY AND DROP OFF THIS EVENING. A COLD FRONT IS EXPECTED
INTO THE BURN AREA LATE SATURDAY OR EARLY SUNDAY
MORNING...RESULTING IN MUCH HIGHER TEMPERATURES FOR SATURDAY AHEAD
OF THE FRONT. GILSTAD

.TODAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....78-83.
MIN HUMIDITY........17-22 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 5 TO 10 MPH IN THE MORNING SHIFTING
                    TO THE NORTHEAST IN THE AFTERNOON.
 RIDGETOP...........NORTHEAST 5 TO 15 MPH.
MIXING HEIGHT.......6600 FT AGL.
MIXING WINDS........EAST 5 TO 15 MPH.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....45-50.
MAX HUMIDITY........62-67 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......EAST WINDS 5 TO 10 MPH IN THE EVENING SHIFTING
                    TO THE SOUTH OVERNIGHT.
 RIDGETOP...........SOUTHEAST 5 TO 10 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........NORTHEAST 5 TO 10 MPH.

$$
FORECASTER...GILSTAD/BORSUM
REQUESTED BY...LEE OLD BEAR
TYPE OF REQUEST...PRESCRIBED
.TAG 20090923.BLACK.01/BYZ