FNUS75 KBYZ 092054
FWSBYZ

SPOT FORECAST FOR GRASSY RX...USDA FOREST SERVICE GALLATIN NATIONAL FOREST
NATIONAL WEATHER SERVICE BILLINGS MT
254 PM MDT THU MAY 9 2013

FORECAST IS BASED ON IGNITION TIME OF 1405 MDT ON MAY 09.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

MULTIPLE DISTURBANCES WILL BRING SCATTERED AFTERNOON/EVENING
THUNDERSTORMS TO THE BURN SITE THROUGH FRIDAY. MINIMUM RH VALUES
WILL BE IN THE 35 TO 45 PERCENT RANGE THROUGH SATURDAY...MINIMUM
RH VALUES FOR SUNDAY AND MONDAY WILL BE IN THE 25 TO 35 PERCENT
RANGE. HIGH TEMPERATURES OF 50 TO 60 ARE EXPECTED THROUGH
SATURDAY...WITH WARMER CONDITIONS SUNDAY AND MONDAY. COLD FRONTS
WILL PUSH ACROSS THE BURN SITE EARLY FRIDAY MORNING AND AGAIN
MONDAY MORNING. WIND SHIFTS FROM WEST TO NORTH CAN BE ANTICIPATED
WITH THESE FRONTS. A RIDGE OF HIGH PRESSURE WITH WARM AND MAINLY
DRY CONDITIONS IS EXPECTED FOR SUNDAY...ISOLATED AFTERNOON/EVENING
SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE.


.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY. SCATTERED SHOWERS AND
                    THUNDERSTORMS IN THE EVENING.
CWR.................15 PERCENT.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MIN TEMPERATURE.....42-47.
MAX HUMIDITY........73-78 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTHEAST WINDS 5 TO 10 MPH IN THE EVENING BECOMING
                    LIGHT OVERNIGHT. GUSTY AND ERRATIC WINDS
                    EXPECTED NEAR THUNDERSTORMS IN THE EVENING.
 RIDGETOP...........NORTH 5 TO 10 MPH.
MIXING HEIGHT.......4500 FT AGL.
MIXING WINDS........NORTHEAST 5 TO 10 MPH.
HAINES INDEX........4.

.FRIDAY...

SKY/WEATHER.........PARTLY SUNNY. ISOLATED RAIN SHOWERS IN THE
                    MORNING...THEN SCATTERED SHOWERS AND
                    THUNDERSTORMS IN THE AFTERNOON.
CWR.................29 PERCENT.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MAX TEMPERATURE.....54-59.
MIN HUMIDITY........35-45 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 5 TO 10 MPH IN THE MORNING SHIFTING
                    TO THE NORTH 10 TO 15 MPH BY THE AFTERNOON.
                    GUSTY AND ERRATIC WINDS EXPECTED NEAR
                    THUNDERSTORMS IN THE AFTERNOON.
 RIDGETOP...........NORTH 10 TO 20 MPH.
MIXING HEIGHT.......7500 FT AGL.
MIXING WINDS........NORTH 5 TO 15 MPH.
HAINES INDEX........4.

.FRIDAY NIGHT...

SKY/WEATHER.........MOSTLY CLOUDY. SCATTERED SHOWERS AND
                    THUNDERSTORMS IN THE EVENING.
CWR.................17.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MIN TEMPERATURE.....36-41.
MAX HUMIDITY........87-92 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 10 TO 20 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    EVENING.
 RIDGETOP...........WEST 15 TO 20 MPH
MIXING HEIGHT.......MISSING.
MIXING WINDS........
HAINES INDEX........MISSING.

.SATURDAY...

SKY/WEATHER.........PARTLY SUNNY. ISOLATED RAIN SHOWERS IN THE
                    MORNING...THEN SCATTERED SHOWERS AND
                    THUNDERSTORMS IN THE AFTERNOON.
CWR.................17.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MAX TEMPERATURE.....61-66.
MIN HUMIDITY........35-40 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTHWEST WINDS 10 TO 20 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    AFTERNOON.
 RIDGETOP........... NORTHWEST 15 TO 25 MPH


.SATURDAY NIGHT...

SKY/WEATHER.........MOSTLY CLOUDY. SCATTERED SHOWERS AND
                    THUNDERSTORMS IN THE EVENING...CLEARING OVERNIGHT.
CWR.................17.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MIN TEMPERATURE.....36-41.
MAX HUMIDITY........87-92 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 5 TO 15 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    EVENING.
 RIDGETOP........... WEST 10 TO 20 MPH

.SUNDAY...

SKY/WEATHER.........SUNNY. ISOLATED RAIN SHOWERS AND
                    THUNDERSTORMS IN THE AFTERNOON.
CWR.................17.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MAX TEMPERATURE.....65-72.
MIN HUMIDITY........25-35 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST TO NORTHWEST WINDS 5 TO 15 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    AFTERNOON.
 RIDGETOP...........NORTHWEST 15 TO 25 MPH


.SUNDAY NIGHT...

SKY/WEATHER.........MOSTLY CLOUDY. SCATTERED SHOWERS AND
                    THUNDERSTORMS IN THE EVENING.
CWR.................17.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL. .
MIN TEMPERATURE.....36-41.
MAX HUMIDITY........87-92 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 5 TO 15 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    EVENING.
 RIDGETOP...........WEST  20 TO 30 MPH


.MONDAY...

SKY/WEATHER.........PARTLY SUNNY. SCATTERED SHOWERS IN THE
                    MORNING...SCATTERED SHOWERS AND
                    THUNDERSTORMS IN THE AFTERNOON.
CWR.................30.
LAL.................3...9 TO 15 STRIKES/15 MIN/CELL.
MAX TEMPERATURE.....61-66.
MIN HUMIDITY........25-35 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST WINDS 10 TO 20 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    AFTERNOON.
 RIDGETOP...........WEST TO SOUTHWEST 30 TO 40 MPH


$$
FORECASTER...GILSTAD
REQUESTED BY...CRISTI HEANEY
TYPE OF REQUEST...PRESCRIBED
.TAG 20130509.GRASS.01/BYZ