FNUS76 KSEW 140107
FWSSEW

SPOT FORECAST FOR RAINBOW BRIDGE...NATIONAL PARK SERVICE
NATIONAL WEATHER SERVICE SEATTLE WA
607 PM PDT FRI AUG 13 2010

FORECAST IS BASED ON IGNITION TIME OF 1820 PDT ON AUGUST 13.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...A CRITICAL FIRE WEATHER EPISODE FOR WESTERN
WASHINGTON HAS BEGUN AND WILL CONTINUE THROUGH AT LEAST MONDAY.
MODERATE NORTHEAST WINDS THIS AFTERNOON ARE SPREADING A HOTTER
AND DRIER CONTINENTAL AIR MASS INTO THE AREA TODAY. TRUER EAST
WIND WILL DEVELOP ON SATURDAY MORNING...CAUSING EVEN HOTTER AND
DRIER WEATHER WHILE INCREASING EAST WIND FOR THE CASCADE
FOOTHILLS DURING THE MORNING.

ALL THE WHILE...A THERMAL PRESSURE TROUGH HAS DEVELOPED NEAR THE
COAST. IT WILL STRENGTHEN SATURDAY AND THEN MOVE INLAND OVER THE
OLYMPIC PENINSULA SUNDAY. IT SHOULD REACH THE I-5 CORRIDOR ON
MONDAY. THIS WILL BRING AN UNSTABLE LOW-LEVEL ENVIRONMENT
STARTING TONIGHT WITH INSTABILITY INCREASING THROUGH THE WEEKEND.
WIDESPREAD MID-LEVEL HAINES 5 CONDITIONS ARE EXPECTED WITH A HIGH
6 MIXED IN AT TIMES THROUGH AT LEAST MONDAY.

FUELS WILL DRY RAPIDLY THROUGH MONDAY GIVEN THE SUNNY...DRY...
UNSTABLE AND LOCALLY BREEZY CONDITIONS.

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

.SATURDAY...

SKY/WEATHER.........SUNNY.
CWR.................LESS THAN 10%.
MAX TEMPERATURE.....83-93.
MIN HUMIDITY........18-24 PERCENT.
WIND (EYE LEVEL)....EAST WINDS 5 TO 9 MPH.
HAINES INDEX........3 OR VERY LOW.
LAL.................1.

.SATURDAY NIGHT...

SKY/WEATHER.........CLEAR.
CWR.................LESS THAN 10%.
MIN TEMPERATURE.....54-60.
MAX HUMIDITY........60 PERCENT.
WIND (EYE LEVEL)....EAST WINDS 3 TO 8 MPH.
HAINES INDEX........3 OR VERY LOW.
LAL.................1.

.SUNDAY...

SKY/WEATHER.........SUNNY.
CWR.................LESS THAN 10%.
MAX TEMPERATURE.....85-95.
MIN HUMIDITY........17-24 PERCENT.
WIND (EYE LEVEL)....SOUTHEAST WINDS 3 TO 7 MPH.
HAINES INDEX........3 OR VERY LOW.
LAL.................1.

$$
FORECASTER...BURKE
REQUESTED BY...LESHA HASTINGS-SKAER
TYPE OF REQUEST...PRESCRIBED
.TAG 20100813.RAINB.01/SEW