FNUS76 KSTO 121741
FWSSTO

SPOT FORECAST FOR TWIN BRIGDES PILES...U.S.FOREST SERVICE
NATIONAL WEATHER SERVICE SACRAMENTO CA
941 AM PST THU NOV 12 2009

FORECAST IS BASED ON IGNITION TIME OF 1030 PST ON NOVEMBER 12.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
WINDS ACROSS THE BURNSITE WILL REMAIN LIGHT THROUGH FRIDAY MORNING.
THOUGH GENERAL UPPER AIR FLOW ACROSS RIDGETOPS IS NORTHERLY...
SURFACE WINDS AROUND BURNSITE SHOULD BE MORE TERRAIN DRIVEN WITH
LIGHT UPSLOPE FLOW DEVELOPING THIS AFTERNOON. RECENT FRONTAL PASSAGE
WILL KEEP RH VALUES ON THE WETTER SIDE. ANOTHER STORM
WILL MOVE ACROSS NORTHERN CALIFORNIA TOMORROW WITH SNOW SHOWERS
PROBABLE IN THE BURNSITE VICINITY AND WINDS BECOMING SOUTHWESTERLY
AHEAD OF THE FRONT.

.TODAY...

SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF SNOW SHOWERS IN
                    THE MORNING.
MAX TEMPERATURE.....AROUND 42.
MIN HUMIDITY........47-57 PERCENT.
WIND (20 FT)........
   SLOPE/VALLEY.....LIGHT UPSLOPE WINDS AT 3 TO 8 MPH.
   RIDGETOP.........NORTH AROUND 5 TO 10 MPH.
MIXING HEIGHT.......1000 FT AGL INCREASING TO 4000-5000 FT AGL
                    IN THE AFTERNOON.
MIXING WINDS........NORTH AROUND 7 MPH.

.FRIDAY...

SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SNOW SHOWERS THROUGH
                    THE DAY.
MAX TEMPERATURE.....AROUND 42.
MIN HUMIDITY........50-60 PERCENT.
WIND (20 FT)........
   SLOPE/VALLEY.....LIGHT WINDS BECOMING SOUTHWEST 5 TO 10 MPH IN
                    THE AFTERNOON.
   RIDGETOP.........SOUTHWEST AROUND 7 TO 12 MPH.
MIXING HEIGHT.......400 FT AGL INCREASING TO 2800-3800 FT AGL IN
                    THE AFTERNOON.
MIXING WINDS........SOUTHWEST AROUND 10 MPH.


FORECASTER...JBB
REQUESTED BY...DALE NEWBY
REASON FOR REQUEST...PRESCRIBED
.TAG 20091112.TWINB.01/STO

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