FNUS76 KSEW 022317
FWSSEW

SPOT FORECAST FOR RAINBOW BRIDGE...NPS NORTH CASCADES
NATIONAL WEATHER SERVICE SEATTLE WA
417 PM PDT MON AUG 2 2010

FORECAST IS BASED ON REQUEST TIME OF 1644 MDT ON AUGUST 02.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...A WEAK UPPER TROUGH WILL DROP SOUTH OUT OF BRITISH
COLUMBIA THROUGH TUESDAY MORNING AND FORM AN UPPER LOW OVER WESTERN
WASHINGTON LATER TUESDAY INTO WEDNESDAY. THIS FEATURE WILL BRING A
THREAT OF SHOWERS AND THUNDERSTORMS TO THE AREA TUESDAY AND A
BETTER CHANCE WEDNESDAY. THE SHOWERS AND THUNDERSTORMS ON
WEDNESDAY WILL BE SLOW MOVERS AND GENERALLY BE ANCHORED TO THE
TERRAIN. THE TROUGH WILL LINGER OVER THE AREA INTO THURSDAY AS IT
WEAKENS...CONTINUING THE THREAT FOR A SHOWER OR THUNDERSTORM.

A MODERATELY STRONG ONSHORE PUSH WILL DEVELOP LATE FRIDAY IN
ADVANCE OF A STRONGER UPPER TROUGH APPROACHING FROM THE WEST. IF
THE TIMING HOLDS...THIS PUSH IS EXPECTED TO SPILL OVER THE
CASCADES LATE FRIDAY KICKING UP A NORTHWEST BREEZE LATE IN THE
DAY...AS WELL AS COOLER AND SOMEWHAT MORE HUMID CONDITIONS FOR THE
WEEKEND.

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

.TUESDAY...

SKY/WEATHER.........MORNING SUNSHINE THEN PARTLY CLOUDY. HAZY.
                    A CHANCE OF SHOWERS AND THUNDERSTORMS FROM
                    MID AFTERNOON ONWARD.
CWR.................10 PERCENT.
MAX TEMPERATURE.....85 AT 1200 FT AND 67 AT 6000 FT.
MIN HUMIDITY........28 PERCENT AT 1200 FT AND 52 PERCENT AT 6000 FT.
WIND (20 FT)........UPSLOPE/UPVALLEY 3 TO 6 MPH BECOMING NORTHWEST
                    4 TO 7 MPH AFT 1700 PDT.
HAINES INDEX........3 OR VERY LOW.
LAL.................2.

.TUESDAY NIGHT...

SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SHOWERS THUNDERSTORMS
                    IN THE EVENING. HAZY.
CWR.................LESS THAN 10%.
MIN TEMPERATURE.....57 AT 1200 FT AND 49 AT 6000 FT.
MAX HUMIDITY........70-75 AT 1200 FT AND 85-95 AT 6000 FT.
WIND (20 FT)........NORTHWEST WINDS 3 TO 5 MPH EARLY EVENING THEN
                    DOWNSLOPE/DOWNVALLEY 1 TO 4 MPH.
HAINES INDEX........3 OR VERY LOW.
LAL.................2.

.WEDNESDAY...

SKY/WEATHER.........PARTLY SUNNY. HAZY. CHANCE OF SHOWERS
                    AND THUNDERSTORMS IN THE AFTERNOON.
CWR.................25 PERCENT.
MAX TEMPERATURE.....87 AT 1200 FT AND 69 AT 6000 FT.
MIN HUMIDITY........24-27 AT 1200 FT AND 50-55 PERCENT AT 6000 FT.
WIND (20 FT)........UPSLOPE/UPVALLEY 3 TO 6 MPH BECOMING NORTHWEST
                    4 TO 7 MPH AFT 1700 PDT.
HAINES INDEX........3 OR VERY LOW.
LAL.................3.

.FORECAST DAYS 3 THROUGH 5...
.THURSDAY...
PARTLY TO MOSTLY CLOUDY. SCATTERED SHOWERS AND THUNDERSTORMS.
LOWS AROUND 60 VALLEY AND 50 RIDGE. HIGHS AROUND 90 VALLEY AND 70 RIDGE.
UPVALLEY/UPSLOPE WINDS 5 TO 8 MPH THEN NORTHWEST 4 TO 7 MPH LATE.
.FRIDAY...
PARTLY CLOUDY. SCATTERED SHOWERS AND THUNDERSTORMS. LOWS AROUND 60
VALLEY AND 50 RIDGE. HIGHS AROUND 85 VALLEY AND 65 RIDGE.
UPVALLEY/UPSLOPE 4 TO 8 MPH BECOMING NORTHWEST 7 TO 12 MPH LATE
WITH POSSIBLE BRIEF GUSTS TO 25 MPH.
.SATURDAY...
PARTLY CLOUDY. LOWS IN THE 50S VALLEY AND 40S RIDGE. HIGHS IN THE
LOWER 80S VALLEY AND LOWER 60S RIDGE. NORTHWEST WIND 5 TO 9 MPH.

$$
FORECASTER...CERNIGLIA
REQUESTED BY...FBAN
TYPE OF REQUEST...WILDFIRE
.TAG 20100802.RAINB.01/SEW