FNUS75 KBYZ 271714
FWSBYZ

SPOT FORECAST FOR GRANNIS FIRE...PARK COUNTY RURAL
NATIONAL WEATHER SERVICE BILLINGS MT
1114 AM MDT SAT APR 27 2013

FORECAST IS BASED ON REQUEST TIME OF 1120 MDT ON APRIL 27.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
WINDS WILL INCREASE AT THE FIRE TODAY AS HUMIDITY FALLS TO NEAR 10
PERCENT. EXPECT WINDS TO REMAIN WEST NORTHWESTERLY THROUGH THE
AFTERNOON WITH GUSTS REACHING 35 TO 40 MPH BETWEEN 1400 AND 1800.
CLOUD COVER WILL BEGIN TO INCREASE AFTER 1500. THE AIRMASS WILL BE
UNSTABLE THROUGH THE AFTERNOON HOURS. HUMIDITY RECOVERY WILL BE
SLOW TONIGHT AS TEMPERATURES REMAIN MILD BUT WINDS WILL DECREASE
AFTER DARK. COLD FRONT WILL MOVE THROUGH THE AREA EARLY SUNDAY
MORNING BRINGING HIGHER HUMIDITY AND COOLER TEMPERATURES WITH A
CHANCE FOR MOISTURE. WINDS WILL BECOME NORTHERLY BEHIND THE FRONT.
BORSUM

.TODAY...

SKY/WEATHER.........MOSTLY SUNNY UNTIL 1500 BECOMING PARTLY CLOUDY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....73-78.
MIN HUMIDITY........7-12 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS INCREASING TO 15 TO 25 MPH IN THE
                    AFTERNOON WITH GUSTS TO OF 35 TO 40 MPH POSSIBLE.
 RIDGETOP...........WEST 30 TO 40 MPH.
MIXING HEIGHT.......10400 FT AGL.
MIXING WINDS........WEST 20 TO 35 MPH.
HAINES INDEX........5.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY. ISOLATED RAIN SHOWERS OVERNIGHT
                    AFTER MIDNIGHT.
CWR.................9 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....41-46.
MAX HUMIDITY........58-63 PERCENT BUT RECOVERY WILL NOT BEGIN UNTIL
                    AFTER 2300.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 10 TO 20 MPH. GUSTS UP TO 30 MPH IN
                    THE EVENING.
 RIDGETOP...........WEST 25 TO 40 MPH.
MIXING HEIGHT.......2200 FT AGL.
MIXING WINDS........WEST 20 TO 35 MPH.
HAINES INDEX........5.

.SUNDAY...

SKY/WEATHER.........PARTLY SUNNY WITH SCATTERED RAIN SHOWERS.
CWR.................11 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....60-65.
MIN HUMIDITY........22-27 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTHWEST WINDS 10 TO 20 MPH.
 RIDGETOP...........WEST 10 TO 20 MPH.
MIXING HEIGHT.......8600 FT AGL.
MIXING WINDS........WEST 15 TO 30 MPH.
HAINES INDEX........4.

$$
FORECASTER...BORSUM
REQUESTED BY...JEFF TONG
TYPE OF REQUEST...WILDFIRE
.TAG 20130427.GRANN.01/BYZ