FNUS75 KBYZ 202144
FWSBYZ

SPOT FORECAST FOR MEXICAN HILL RX...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
344 PM MDT MON SEP 20 2010

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON SEPTEMBER 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
AN AREA OF WEAK LOW PRESSURE WILL BE OVER THE BURN SITE ON TUESDAY.
A COLD FRONT WILL MOVE THROUGH THE BURN SITE LATE IN THE DAY AND
THE WEATHER WILL REMAIN DRY. SOUTHWEST WINDS AT 5 TO 15 MPH WILL
BECOME EAST 5 MPH OR LESS LATE IN THE DAY. TEMPERATURES WILL REACH
THE UPPER 40S TO MID 50S AND RELATIVE HUMIDITIES WILL BE IN THE 30S.
THE COLD FRONT WILL REMAIN STATIONARY NEAR THE BURN SITE TUESDAY
NIGHT. EAST WINDS AROUND 5 MPH WILL BECOME SOUTH 5 TO 15 MPH LATE.
RELATIVE HUMIDITIES WILL RECOVER INTO THE 60S. LOW PRESSURE WILL
APPROACH THE SITE FROM THE SOUTHWEST ON WEDNESDAY BRINGING ISOLATED
SHOWERS IN THE MORNING AND SCATTERED SHOWERS IN THE AFTERNOON.
TEMPERATURES WILL BE IN THE UPPER 40S TO LOWER 50S AND RELATIVE
HUMIDITIES WILL BE IN THE 30S. THE WINDS WILL BE SOUTH 5 TO 15 MPH.

.TUESDAY...

SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....49-54.
MIN HUMIDITY........33-38 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 15 MPH...BECOMING EAST 5 MPH
                    OR LESS LATE IN THE AFTERNOON.
 RIDGETOP...........WEST 15 TO 30 MPH.
MIXING HEIGHT.......4000 FT AGL.
MIXING WINDS........SOUTH 15 TO 25 MPH.
HAINES INDEX........2.

.TUESDAY NIGHT...

SKY/WEATHER.........PARTLY CLOUDY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....38-43.
MAX HUMIDITY........63-68 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......EAST WINDS AROUND 5 MPH...BECOMING SOUTH
                    5 TO 15 MPH LATE.
 RIDGETOP...........SOUTH 10 TO 20 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........SOUTHEAST 5 TO 15 MPH.
HAINES INDEX........3.

.WEDNESDAY...

SKY/WEATHER.........MOSTLY SUNNY WITH ISOLATED RAIN SHOWERS IN THE
                    MORNING...THEN MOSTLY CLOUDY WITH SCATTERED
                    RAIN SHOWERS IN THE AFTERNOON.
CWR.................13 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....47-52.
MIN HUMIDITY........33-38 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTH WINDS 5 TO 15 MPH.
 RIDGETOP...........SOUTH 15 TO 30 MPH.
MIXING HEIGHT.......400 FT AGL.
MIXING WINDS........SOUTH 15 TO 25 MPH.
HAINES INDEX........3.

$$
FORECASTER...ARTHUR
REQUESTED BY...JON WARDER
TYPE OF REQUEST...PRESCRIBED
.TAG 20100921.MEXIC.01/BYZ