FNUS76 KSEW 041336
FWSSEW

SPOT FORECAST FOR TA 18 PRAIRIE...FT LEWIS FORESTRY
NATIONAL WEATHER SERVICE SEATTLE WA
636 AM PDT TUE AUG 4 2009

FORECAST IS BASED ON IGNITION TIME OF 1100 PDT ON AUGUST 04.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...AN UPPER LEVEL RIDGE OF HIGH PRESSURE OVER WESTERN
WASHINGTON CONTINUES TO GRADUALLY WEAKEN AS LOW LEVEL ONSHORE FLOW
GRADUALLY INCREASES. THIS WILL RESULT IN COOLER MAX TEMPERATURES
EACH DAY THROUGH WEDNESDAY. A WEAK WEATHER SYSTEM MOVING NORTHWARD
AND AN UPPER LEVEL TROUGH SINK SOUTHWARD FROM  BRITISH COLUMBIA
LATE TUESDAY HAS PROMPTED THE INCLUSION OF A SLIGHT CHANCE OF
THUNDERSTORMS IN THE FORECAST NEAR THE CASCADE CREST TUESDAY EVENING.
AN UPPER LEVEL TROUGH OF LOW PRESSURE OFF THE CALIFORNIA COAST IS
STILL EXPECTED TO SHIFT INLAND LATE WEDNESDAY OR THURSDAY PRODUCING
EVEN COOLER TEMPERATURES AND THE THREAT OF SHOWERS TO THE REGION.

 FORECAST FOR 20 FOOT WIND SPEED (VALLEYS AND RIDGE TOPS) ARE 10
 MINUTE AVERAGES REFLECTING RAWS WINDS.

.TODAY...

SKY/WEATHER.........CLOUDY IN THE MORNING...SUNNY IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 78.
MIN HUMIDITY........38 PERCENT.
EYE LEVEL WINDS.....SOUTHWEST WINDS 3 TO 5 MPH.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST WINDS 3 TO 5 MPH.
MIXING HEIGHT.......0 FT AGL INCREASING TO 5100 FT AGL LATE IN THE
                    MORNING.
TRANSPORT WINDS.....SOUTHWEST AROUND 7 MPH.
HAINES INDEX........4 OR LOW.

$$
FORECASTER...FELTON
REQUESTED BY...DAN LEEPER
TYPE OF REQUEST...PRESCRIBED
.TAG 20090804.TA18P.01/SEW