FNUS75 KBYZ 292230
FWSBYZ

SPOT FORECAST FOR TWINN BUTTE...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
430 PM MDT WED AUG 29 2012

FORECAST IS BASED ON IGNITION TIME OF 1625 MDT ON AUGUST 29.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

...RED FLAG WARNING IN EFFECT UNTIL MIDNIGHT MDT TONIGHT...

.DISCUSSION...

SOMEWHAT ERRATIC WINDS ARE EXPECTED LATE THIS AFTERNOON/EARLY
EVENING. GUSTY SOUTHWESTERLY WINDS AT THE FIRE SITE SHOULD
DECREASE BY LATE EVENING AND BECOME DOWNSLOPE OVERNIGHT. WINDS
REMAIN LIGHT THURSDAY...FAVORING NORMAL DIURNAL PATTERNS. RH
RECOVERIES WILL BE POOR TONIGHT...WITH RH VALUES ONLY INTO THE
TEENS AGAIN THURSDAY. TEMPERATURES WILL BE MUCH COOLER THURSDAY.
THERE WILL BE A SLIGHT CHANCE SHOWERS AND THUNDERSTORMS OVER THE
BURN SITE THURSDAY NIGHT AND FRIDAY AS ANOTHER ANOTHER WEATHER
SYSTEM MOVES INTO THE REGION.

.REST OF TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....48-53.
MAX HUMIDITY........41-46 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 15 MPH....BECOMING DOWNSLOPE
                    OVERNIGHT...AND REMAINING LIGHT.
 RIDGETOP...........WEST 15 TO 30 MPH.
MIXING HEIGHT.......9300 FT AGL EARLY IN THE EVENING DECREASING TO
                    1000 FT AGL.
MIXING WINDS........WEST 15 TO 25 MPH EARLY IN THE EVENING SHIFTING
                    TO THE NORTH 5 TO 15 MPH.
HAINES INDEX........6.

.THURSDAY...

SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....74-79.
MIN HUMIDITY........13-18 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WINDS 5 TO 10 MPH...FAVORING NORMAL
                    DIURNAL PATTERNS.
 RIDGETOP...........SOUTHWEST 15 TO 25 MPH.
MIXING HEIGHT.......6800 FT AGL.
MIXING WINDS........SOUTH 5 TO 15 MPH.
HAINES INDEX........4.

.THURSDAY NIGHT...

SKY/WEATHER.........PARTLY CLOUDY WITH SCATTERED SHOWERS AND
                    THUNDERSTORMS.
CWR.................13 PERCENT.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MIN TEMPERATURE.....51-56.
MAX HUMIDITY........45-50 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTH WINDS 5 TO 15 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS.
 RIDGETOP...........SOUTHWEST 10 TO 20 MPH.
MIXING HEIGHT.......2300 FT AGL.
MIXING WINDS........SOUTH 5 TO 15 MPH.
HAINES INDEX........5.

.FRIDAY...

SKY/WEATHER.........MOSTLY SUNNY WITH SCATTERED SHOWERS AND
                    THUNDERSTORMS.
CWR.................13 PERCENT.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MAX TEMPERATURE.....75-80.
MIN HUMIDITY........17-22 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTH WINDS 5 TO 10 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS.
 RIDGETOP...........SOUTHWEST 10 TO 20 MPH.
MIXING HEIGHT.......9000 FT AGL.
MIXING WINDS........SOUTHEAST 5 TO 15 MPH.
HAINES INDEX........5.

$$
FORECASTER...GILSTAD
REQUESTED BY...IC
TYPE OF REQUEST...PRESCRIBED
.TAG 20120829.TWINN.01/BYZ