FNUS75 KBYZ 211427
FWSBYZ

SPOT FORECAST FOR BLACK SPRINGS RX...NORTHERN CHEYENNE AGENCY
NATIONAL WEATHER SERVICE BILLINGS MT
827 AM MDT THU OCT 21 2010

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON OCTOBER 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

HIGH PRESSURE WILL REMAIN OVER THE BURN SITE TODAY...BUT BEGIN TO
WEAKEN ON FRIDAY. SKIES WILL BE MOSTLY CLEAR THROUGH FRIDAY WITH
CONTINUED ABOVE NORMAL TEMPERATURES. MINIMUM RELATIVE HUMIDITIES
WILL BE LOW TODAY IN THE UPPER TEENS TO LOWER 20S. HUMIDITIES WILL
COME UP A LITTLE ON FRIDAY INTO THE 20S. WIND DIRECTION WILL NOT BE
FAVORABLE FOR THE BURN THROUGH FRIDAY. WINDS WILL BECOME SOUTHWEST
5 TO 10 MPH THIS AFTERNOON AND WILL BE NORTHEAST 5 TO 10 MPH
FRIDAY AFTERNOON. SOUTHEAST WINDS WILL BE POSSIBLE FOR THE BURN
SATURDAY NIGHT INTO EARLY SUNDAY WITH RELATIVE HUMIDITIES ABOVE 25
PERCENT...OTHERWISE A COLD FRONT WILL MOVE THROUGH THE AREA LATE
SUNDAY NIGHT USHERING IN STRONG NORTHWEST WINDS AND COOLER AND WETTER
CONDITIONS FOR EARLY NEXT WEEK.

.REST OF TODAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....70-75.
MIN HUMIDITY........17-22 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNSLOPE/DOWN VALLEY WINDS LESS THAN 5 MPH
                    BECOMING SOUTHWEST 5 TO 10 MPH IN THE AFTERNOON.
 RIDGETOP...........WEST 5 TO 15 MPH.
MIXING HEIGHT.......3900 FT AGL.
MIXING WINDS........WEST 5 TO 15 MPH.

.TONIGHT...

SKY/WEATHER.........CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....37-42.
MAX HUMIDITY........65-70 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNSLOPE/DOWN VALLEY WINDS 5 MPH OR LESS.
 RIDGETOP...........WEST 5 TO 15 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........WEST 5 TO 15 MPH.

.FRIDAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....65-70.
MIN HUMIDITY........22-27 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNSLOPE/DOWN VALLEY WINDS 5 MPH OR LESS BECOMING
                    NORTHEAST 5 TO 10 MPH IN THE AFTERNOON.
 RIDGETOP...........EAST 5 TO 15 MPH.
MIXING HEIGHT.......3700 FT AGL.
MIXING WINDS........EAST 5 TO 10 MPH.

$$
FORECASTER...ARTHUR
REQUESTED BY...LEE OLD BEAR
TYPE OF REQUEST...PRESCRIBED
.TAG 20101021.BLACK.01/BYZ