FNUS76 KSEW 160145
FWSSEW

SPOT FORECAST FOR RAINBOW BRIDGE...NATIONAL PARK SERVICE
NATIONAL WEATHER SERVICE SEATTLE WA
645 PM PDT SUN AUG 15 2010

FORECAST IS BASED ON REQUEST TIME OF 1815 PDT ON AUGUST 15.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...A STRONG UPPER LEVEL RIDGE WILL CONTINUE TO DOMINATE
THE WEATHER PATTERN THROUGH MONDAY. HOWEVER A TRANSITION WILL OCCUR
MONDAY NIGHT AND TUESDAY...AS THE RIDGE WEAKENS AND A WEAK UPPER
TROUGH MOVES OVER THE PACIFIC NORTHWEST. IN ADDITION THE THERMAL
PRESSURE TROUGH...OVER THE WESTERN WASHINGTON INTERIOR THIS
EVENING...WILL MOVE EAST OF THE CASCADES.

HOT DRY WEATHER WILL PREVAIL AGAIN MONDAY AND TUESDAY. DAYTIME
UPSLOPE AND UPVALLEY WINDS WILL BE THE RULE MUCH OF THE DAY MONDAY IN
A GENERALLY EASTERLY FLOW PATTERN...THOUGH A SHIFT TO NORTHWESTERLY
WINDS IS LIKELY LATE IN THE DAY. NORTHWESTERLIES WILL DOMINATE AND
INCREASE IN STRENGTH MONDAY NIGHT AND TUESDAY.

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

.TONIGHT...

SKY/WEATHER.........CLEAR.
CWR.................LESS THAN 10%.
MIN TEMPERATURE.....59-64.
MAX HUMIDITY........51-58 PERCENT.
WIND (20 FT)........
 LWR SLP/VALLEY.....NORTHEAST DOWNSLOPE WINDS 3 TO 6 MPH SHIFTING TO
                    NORTHERLY DOWNVALLEY WINDS AROUND 3 MPH AFTER MIDNIGHT.
HAINES INDEX........3 OR VERY LOW.
LAL.................1.

.MONDAY...

SKY/WEATHER.........SUNNY.
CWR.................LESS THAN 10%.
MAX TEMPERATURE.....86-96.
MIN HUMIDITY........18-26 PERCENT.
WIND (20 FT)........
 LWR SLP/VALLEY.....UPVALLEY SOUTH WINDS 3 TO 6 MPH SHIFTING TO
                    SOUTHWEST UPSLOPE WINDS 3 TO 6 MPH MIDDAY...THEN BECOMING NORTHWEST
                    6 TO 12 MPH LATE AFTERNOON.
HAINES INDEX........3 OR VERY LOW.
LAL.................1.

$$

FORECASTER...MCDONNAL
REQUESTED BY...LESHA HASTINGS-SKAER
TYPE OF REQUEST...WILDFIRE
.TAG 20100815.RAINB.01/SEW