000 
FXUS66 KPQR 260358
AFDPQR

NORTHWEST OREGON AND SOUTHWEST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
900 PM PDT MON AUG 25 2003

.SYNOPSIS...A LOW PRESSURE SYSTEM OFF THE WEST COAST OF BRITISH
COLUMBIA WILL MOVE SLOWLY INTO BRITISH COLUMBIA EARLY TUESDAY. AN
ASSOCIATED WEAK FRONT WILL MOVE THROUGH THE PAC NORTHWEST TONIGHT. A
WEAK UPPER RIDGE WILL DEVELOP MID WEEK AS LOW PRESSURE STALLS IN THE
ROCKY MOUNTAIN AREA GIVING THE AREA SUNNY SKIES WITH SEASONABLE
TEMPERATURES.

.DISCUSSION...
.SHORT TERM...SATELLITE INDICATES MARINE CLOUDS MAKING A GOOD PUSH
INLAND THIS EVENING...WITH METARS INDICATING ONSHORE WINDS STILL
AROUND 10 KTS THROUGHOUT THE INLAND VALLEYS.  AS THE DECAYING FRONTAL
BOUNDARY SLOWLY SHIFTS E INTO THE FORECAST AREA TONIGHT...EXPECT
MARINE CLOUDS TO EVENTUALLY REACH INTO MUCH OF THE INLAND VALLEYS BY
MORNING.  WITH THE UPPER TROUGH SLOW TO MOVE THROUGH...THE COOL DOWN
BEGINNING TUE WILL BE SLOW TO WARM MUCH IN THE SHORT TERM.

.LONG TERM...NO CHANGES. PREVIOUS DISCUSSION FOLLOWS...
MODELS START OUT THE EXTENDED PERIOD IN FAIRLY GOOD AGREEMENT IN
HAVING A STRONG UPPER RIDGE OVER BC FRIDAY. AFTER FRIDAY...MODELS
DIVERGE IN THEIR SOLUTIONS FOR THE WEEKEND. MODELS AGREE THAT THE
STRONG UPPER RIDGE OVER BC WILL BE UNDERCUT BY SOME FLOW BREAKING
THROUGH. HOWEVER...GFS IS MORE AGGRESSIVE WITH STRONG LOW HEADING
TOWARDS ORE...WHICH LOOKS OVERDONE. ECMWF SHOWS WEAK SYSTEM
UNDERCUTTING RIDGE MOVING S OF AREA SUN. CANADIAN SHOWS MAIN LOW
STILL OFFSHORE THROUGH SAT. CONFIDENCE IS NOT HIGH WITH DIVERGING
SOLUTIONS...AND IN COORDINATION WITH SURROUNDING OFFICES WILL MAKE NO
CHANGES TO CURRENT FORECAST.

AST 220000  PDX 110000  SLE 110000  EUG 000000

.PQR...NONE.

$$