FNUS75 KBYZ 110127
FWSBYZ

SPOT FORECAST FOR POWERLINE FIRE...GOLDEN VALLEY CO
NATIONAL WEATHER SERVICE BILLINGS MT
727 PM MDT SAT SEP 10 2011

FORECAST IS BASED ON REQUEST TIME OF 1904 MDT ON SEPTEMBER 10.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

...HOT...UNSTABLE AND DRY SUNDAY WITH RH VALUES NEAR 10 PERCENT...
...STRONG COLD FRONT LATE SUNDAY NIGHT WITH GUSTY NORTH WINDS...

EXPECT LIGHT WINDS TONIGHT WITH HUMIDITY RECOVERIES ONLY TO 50
PERCENT.

SUNDAY WILL BE WARM AND DRY AND MORE UNSTABLE AS AN UPPER
LEVEL RIDGE BREAKS DOWN OVER THE REGION. EXPECT AFTERNOON HUMIDITY
TO FALL TO NEAR 10 PERCENT AS TEMPERATURES APPROACH 90. DURING THE
HEAT OF DAY NORTHWEST WINDS WILL BEGIN TO MIX DOWN ON THE FIRE
WITH GUSTS TO 20 MPH. IT WILL REMAIN MILD AND DRY SUNDAY EVENING
WITH HUMIDITIES REMAINING BELOW 30 PERCENT UNTIL MIDNIGHT.

A COLD FRONT WILL MOVE OVER THE FIRE BETWEEN 1 A.M. AND 4 A.M.
MONDAY MORNING BRINGING A SHIFT TO GUSTY NORTH WINDS. TEMPERATURES
WILL BE COOLER MONDAY BEHIND THE FRONT WITH SLIGHTLY HIGHER
HUMIDITY. WINDS WILL DECREASE MONDAY AFTERNOON. BORSUM

.REST OF TONIGHT...

SKY/WEATHER.........CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....47-52.
MAX HUMIDITY........45-50 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......EAST WINDS 4 TO 8 MPH IN THE EVENING SHIFTING
                    TO THE WEST OVERNIGHT.
 RIDGETOP...........SOUTHEAST 5 TO 10 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........SOUTHEAST 5 TO 10 MPH.

.SUNDAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....85-90.
MIN HUMIDITY........9-14 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 10 MPH BECOMING NORTHWEST
                    11 TO 15 MPH BY AFTERNOON WITH GUSTS TO 20 MPH.
 RIDGETOP...........NORTHWEST 15 TO 20 MPH.
MIXING HEIGHT.......12700 FT AGL.
MIXING WINDS........NORTHWEST 20 MPH.

.SUNDAY NIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....50-55.
MAX HUMIDITY........45-50 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 5 TO 10 MPH IN THE EVENING SHIFTING
                    TO THE NORTHWEST AFTER MIDNIGHT AND INCREASING
                    TO 15 TO 20 MPH.
 RIDGETOP...........NORTHWEST 10 TO 20 MPH.
MIXING HEIGHT.......1300 FT AGL.
MIXING WINDS........WEST 10 TO 20 MPH.

.MONDAY...

SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....75-80.
MIN HUMIDITY........28-32 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTHWEST WINDS 12 TO 17 MPH IN THE MORNING
                    DECREASING AND SHIFTING TO THE NORTHEAST IN
                    THE AFTERNOON.
 RIDGETOP...........NORTH 15 TO 30 MPH.
MIXING HEIGHT.......4500 FT AGL.
MIXING WINDS........NORTHWEST 15 TO 30 MPH.

$$
FORECASTER...BORSUM
REQUESTED BY...FLOYD R FISHER
TYPE OF REQUEST...WILDFIRE
.TAG 20110910.POWER.02/BYZ