FNUS76 KSTO 060253
FWSSTO

SPOT FORECAST FOR FAIRFIELD...LASSEN VOLCANIC NATIONAL PARK
NATIONAL WEATHER SERVICE SACRAMENTO CA
650 PM PDT WED AUG 5 2009

#174-09

FORECAST IS BASED ON INCIDENT TIME OF 1810 PDT ON AUGUST 05.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

...RED FLAG WARNING IN EFFECT FROM 1 AM TO 9 PM PDT THURSDAY
   FOR THE POSSIBILITY OF NUMEROUS THUNDERSTORMS...

.DISCUSSION...
A LOW PRESSURE SYSTEM IS STILL ON TRACK TO MOVE THROUGH NORTHERN
CALIFORNIA DURING THE DAY TODAY (THURSDAY) THE SYSTEM WILL BRING
WITH IT SIGNIFICANT INSTABILITY AND MOISTURE SO SCATTERED SHOWERS
AND THUNDERSTORMS ARE LIKELY IN THE AREA. NUMEROUS THUNDERSTORMS
ARE POSSIBLE ESPECIALLY DURING THE AFTERNOON HOURS. THE LOW WILL
ALSO BRING A SIGNIFICANT DROP IN DAYTIME TEMPERATURES AND INCREASING
HUMIDITY. THERE WILL BREEZY WINDS AT TIMES WITH STRONG GUSTY WINDS
NEAR THUNDERSTORMS. THE THUNDERSTORM THREAT SHOULD END BY LATE
THURSDAY EVENING. HIGH PRESSURE WILL BEGIN TO BUILD IN ON FRIDAY
FOR A WARMING AND DRYING TREND.

.TODAY...

SKY/WEATHER.........MOSTLY CLOUDY. SCATTERED THUNDERSTORMS
                    AND SHOWERS ESPECIALLY IN THE AFTERNOON.
MAX TEMPERATURE.....60 TO 65.
MIN HUMIDITY........44 TO 48 PERCENT.
WIND (20 FT)........
   SLOPE/VALLEY.....SOUTH TO SOUTHEAST 2-5 GUSTS TO 10 MPH.
   RIDGETOP.........SOUTH TO SOUTHWEST 3 TO 6 MPH WITH GUSTS
                    UP TO 15 MPH ESPECIALLY IN THE MORNING.
CWR.................50 PERCENT.
LAL.................3 TO 4.
MIXING HEIGHT.......ABOUT 4000 TO 5000 FEET.
MIXING WINDS........SOUTH TO AROUND 10 MPH.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SHOWERS AND
                    THUNDERSTORMS IN THE EVENING...THEN SLIGHT
                    CHANCE OF SHOWERS AFTER MIDNIGHT.
MIN TEMPERATURE.....AROUND 35.
MAX HUMIDITY........90 TO 100 PERCENT.
WIND (20 FT)........
   SLOPE/VALLEY.....NORTHWEST WINDS 2 TO 5 MPH IN THE EVENING
                    BECOMING LIGHT.
   RIDGETOP.........SOUTHWEST TO NORTHWEST AROUND 3 TO 6 GUSTS
                    TO 12 MPH
CWR.................30 PERCENT.
LAL.................3 IN THE EVENING.
MIXING HEIGHT.......3000-4000 FT AGL IN THE EVENING DECREASING TO
                    1000-2200 FT LATE IN THE EVENING AND OVERNIGHT.
MIXING WINDS........WEST 5 TO 10 MPH.

.FRIDAY...

SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY SUNNY.
MAX TEMPERATURE.....AROUND 67 TO 72.
MIN HUMIDITY........32 TO 38 PERCENT.
WIND (20 FT)........
   SLOPE/VALLEY.....WEST TO NORTHWEST 2-5 GUSTS TO 10 MPH.
   RIDGETOP.........NORTHWEST 5 TO 10 MPH.
CWR.................0 PERCENT.
LAL.................1.
MIXING HEIGHT.......CLIMBING TO AROUND 5000 FT
MIXING WINDS........WEST 5 TO 10 MPH.


FORECASTER...SMITH
REQUESTED BY...TOM GARCIA
REASON FOR REQUEST...WFU
.TAG 20090805.FAIRF.02/STO

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