FNUS75 KBYZ 100240
FWSBYZ

SPOT FORECAST FOR RESERVOIR FIRE...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
840 PM MDT FRI SEP 9 2011

FORECAST IS BASED ON REQUEST TIME OF 1952 MDT ON SEPTEMBER 09.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

...MORE UNSTABLE SUNDAY WITH RIDGETOP WINDS WESTERLY...

EXPECT WEAKER RIDGETOP WINDS AT THE FIRE ON SATURDAY AS UPPER
LEVEL HIGH PRESSURE BECOMES CENTERED OVER THE NORTHERN BIG HORNS.
IT WILL BE ANOTHER WARM AND DRY DAY WITH HUMIDITY MINIMUMS IN THE
UPPER TEENS. SLOPE EFFECTS WILL DOMINATE THE LOWER ELEVATIONS WITH
RIDGETOP WINDS LESS THAN 10 MPH. SUNDAY WILL BE MORE UNSTABLE WITH
RIDGETOP WINDS BECOMING NORTHWESTERLY. AFTERNOON WIND GUSTS OF 20
MPH FROM THE NORTHWEST WILL BE POSSIBLE DURING THE HEAT OF DAY.
EXPECT HUMIDITY TO FALL INTO THE LOWER TEENS WHILE TEMPERATURES
REMAIN IN THE UPPER 60S. IT WILL REMAIN UNSTABLE ON MONDAY WITH EVEN
CONTINUED NORTHWESTERLY WINDS BUT HIGHER HUMIDITY. BORSUM

.REST OF TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....39-44.
MAX HUMIDITY........55-60 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNVALLEY 4 TO 8 MPH.
 RIDGETOP...........WEST 5 TO 10 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........NORTHEAST 10 TO 20 MPH.

.SATURDAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....64-69.
MIN HUMIDITY........17-21 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......UPSLOPE/UPVALLEY 3 TO 7 MPH.
 RIDGETOP...........VARIABLE LESS THAN 10 MPH BUT GENERALLY
                    EAST.
MIXING HEIGHT.......7800 FT AGL.
MIXING WINDS........NORTHWEST 5 TO 10 MPH.

.SATURDAY NIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....42-47.
MAX HUMIDITY........45-50 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNSLOPE/DOWNVALLEY 4 TO 8 MPH.
 RIDGETOP...........SOUTHWEST 8 TO 12 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........SOUTHWEST 5 TO 15 MPH.

.SUNDAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....64-69.
MIN HUMIDITY........13-17 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......UPSLOPE/UPVALLEY 8 TO 12 MPH.
 RIDGETOP...........WEST 15 TO 20 MPH TRENDING NORTHWEST.
MIXING HEIGHT.......10200 FT AGL.
MIXING WINDS........NORTHWEST 15 TO 20 MPH.

$$
FORECASTER...BORSUM
REQUESTED BY...JON WARDER
TYPE OF REQUEST...WILDFIRE
.TAG 20110909.RESER.02/BYZ