FNUS75 KBYZ 192050
FWSBYZ

SPOT FORECAST FOR GILEAD DIVISION T...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
250 PM MDT WED SEP 19 2012

FORECAST IS BASED ON REQUEST TIME OF 1430 MDT ON SEPTEMBER 19.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
PERSISTENT UPPER LEVEL HIGH PRESSURE OVER THE WESTERN UNITED
STATES WILL BEGIN SHIFTING EAST DURING THE NEXT TWO DAYS. THIS
WILL ALLOW NORTHWESTERLY FLOW ALOFT TO PERSIST BUT SURFACE HIGH
PRESSURE SHOULD ALLOW DIURNAL UPSLOPE AND UPVALLEY WINDS TO
DOMINATE. A WEAK FRONT PASSING THROUGH THE AREA IN THE THURSDAY
MORNING WILL NOT IMPACT THE WINDS MUCH BUT WILL HELP KEEP
HUMIDITY A BIT HIGHER. MODERATE HUMIDITY RECOVERY CAN BE EXPECTED
THURSDAY NIGHT WITH SLIGHTLY COOLER TEMPERATURES AND DRAINAGE
WINDS. ANOTHER WEAK FRONT WILL PASS THROUGH THE AREA ON FRIDAY BUT
AGAIN LITTLE IMPACT ON THE WINDS IS EXPECTED BUT THE AIRMASS WILL
BE COOLER.

THE UPPER LEVEL RIDGE WILL BECOME CENTERED OVER THE FIRE AREA ON
SATURDAY WHICH WILL BRING VERY LIGHT WINDS TO THE FIRE AREA.
RIDGETOP WINDS SHOULD BECOME LESS THAN 10 MPH WITH SLOPE AND
VALLEY WINDS FOLLOWING DIURNAL TRENDS. THERMAL BELTS WILL BECOME
MORE NOTICEABLE FRIDAY AND SATURDAY NIGHTS. SUNDAY WILL BE SIMILAR
TO SATURDAY WITH A FEW MORE CUMULUS CLOUDS. ISOLATED SHOWERS ARE
POSSIBLE BY MONDAY BUT MOISTURE WILL BE LIMITED. BORSUM


.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....39-44.
MAX HUMIDITY........43-48 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNSLOPE/DOWNVALLEY 5 TO 10 MPH.
 RIDGETOP...........NORTHWEST 15 TO 30 MPH.
MIXING HEIGHT.......1300 FT AGL.
MIXING WINDS........WEST 5 TO 15 MPH.

.THURSDAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....61-66.
MIN HUMIDITY........22-27 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......UPSLOPE/UPVALLEY 9 TO 15 MPH.
 RIDGETOP...........NORTHWEST 20 TO 30 MPH.
MIXING HEIGHT.......5800 FT AGL.
MIXING WINDS........NORTHWEST 25 TO 35 MPH.

.THURSDAY NIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................ZERO.
LAL.................1...NONE.
MIN TEMPERATURE.....36-41.
MAX HUMIDITY........56-61 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNSLOPE/DOWN VALLEY 5 TO 8 MPH.
 RIDGETOP...........NORTHWEST 15 TO 20 MPH.
MIXING HEIGHT.......1000 FEET AGL.
MIXING WINDS........NORTHWEST 20 MPH.

.FRIDAY...

SKY/WEATHER.........SUNNY.
CWR.................ZERO.
LAL.................1...NONE.
MAX TEMPERATURE.....58-63.
MIN HUMIDITY........22-27 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......UPSLOPE/UPVALLEY 8 TO 12 MPH.
 RIDGETOP...........NORTHWEST 15 MPH
MIXING HEIGHT.......5600 FEET AGL.
MIXING WINDS........NORTHWEST 20 MPH

.OUTLOOK FOR SATURDAY...
SUNNY. TEMPERATURES 60 TO 65. HUMIDITY 19-24 PERCENT. WINDS
UPSLOPE AND UPVALLEY 10 TO 15 MPH. RIDGETOP WINDS NORTH 10 MPH.

.OUTLOOK FOR SUNDAY...
MOSTLY SUNNY. TEMPERATURES 63 TO 68. HUMIDITY 17-22 PERCENT. WINDS
UPSLOPE AND UPVALLEY 10 TO 15 MPH. RIDGETOP WINDS WEST 10 MPH.

$$
FORECASTER...BORSUM
REQUESTED BY...KEVIN HILLARD
TYPE OF REQUEST...WILDFIRE
.TAG 20120919.GILEA.02/BYZ