FNUS75 KBYZ 211415
FWSBYZ

SPOT FORECAST FOR BLACK SPRINGS...NORTHERN CHEYENNE
NATIONAL WEATHER SERVICE BILLINGS MT
814 AM MDT THU MAY 21 2009

FORECAST IS BASED ON IGNITION TIME OF 1200 MDT ON MAY 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
HIGH PRESSURE WILL WEAKEN OVER THE BURN SITE TODAY. IT WILL BE
WARMER THAN YESTERDAY WITH TEMPERATURES CLIMBING INTO THE 65
TO 70 DEGREE RANGE. MINIMUM RELATIVE HUMIDITIES WILL BE IN THE 30S.
WINDS WILL BE SOUTHEAST AT 5 TO 15 MPH. A WEAK LOW PRESSURE TROUGH
WILL BE OVER THE SITE TONIGHT. DRY WEATHER WILL CONTINUE AND SOUTHEAST
WINDS AT 5 TO 10 MPH WILL BECOME DOWNSLOPE/DOWN VALLEY AROUND 5 MPH
OVERNIGHT.

.REST OF TODAY...

SKY/WEATHER.........PARTLY CLOUDY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....65-70.
MIN HUMIDITY........33-38 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHEAST WINDS 5 TO 15 MPH.
 RIDGETOP...........SOUTHEAST 10 TO 20 MPH.
MIXING HEIGHT.......4600 FT AGL.
MIXING WINDS........SOUTHEAST 10 TO 20 MPH.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....44-49.
MAX HUMIDITY........69-74 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHEAST WINDS 5 TO 10 MPH BECOMING DOWNSLOPE/DOWN
                    VALLEY AROUND 5 MPH OVERNIGHT.
 RIDGETOP...........SOUTHEAST 5 TO 15 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........SOUTHEAST 5 TO 15 MPH.

$$
FORECASTER...ARTHUR
REQUESTED BY...LEE OLD BEAR
TYPE OF REQUEST...PRESCRIBED
.TAG 20090521.BLACK.01/BYZ