015 
FXUS66 KPQR 062111
AFDPQR

NORTHWEST OREGON AND SOUTHWEST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
115 PM PST MON JAN 6 2003

.SYNOPSIS...EAST OF THE CASCADES WILL KEEP THE AREA IN A DRY OFFSHORE
FLOW FOR MUCH OF THE WEEK.  A STABLE AIR MASS UNDER AN UPPER LEVEL
HIGH PRESSURE RIDGE WILL FAVOR THE DEVELOPMENT OF FOG AND CLOUDS IN
THE INLAND VALLEYS.  A CHANGE IN THE PATTERN DOES NOT APPEAR UNTIL
THIS WEEKEND WHEN THE UPPER RIDGE BEGINS TO BREAK DOWN AND A FRONT
COMES IN OFF THE PACIFIC.

.DISCUSSION...
.SHORT TERM...AXIS OF UPPER RIDGE TO SHIFT E OVER NEXT COUPLE OF DAYS
AS SOME SHORTWAVE ENERGY BEGINS TO UNDERCUT THE RIDGE.  FLOW TO
REMAIN OFFSHORE THROUGH MIDWEEK...BUT WEAKENS AS THE SURFACE HIGH
WEAKENS SOME INLAND.  ALTHOUGH THE STRONG SUBSIDENCE INVERSION WILL
WEAKEN SOME...STILL SHOULD BE ENOUGH TO HAVE SOME PERSISTENT CLOUDS
AND FOG IN THE VALLEYS.  THE VERY WARM AIR AT THE TOP OF THE
INVERSION SHOWING UP IN THE FOOTHILLS SHOULD MODIFY AS THE INVERSION
WEAKENS AND 850 MB TEMPS COOL.

.LONG TERM...THROUGH SAT WILL GO ALONG WITH CANADIAN/ECMWF WHICH
DIVERTS PACIFIC SHORTWAVE OVER THE TOP AND UNDERNEATH THE W COAST
RIDGE...LEAVING THE AREA DRY WITH CONTINUED OFFSHORE FLOW.  BY THE
END OF THE WEEKEND MOST MODELS INDICATE RIDGE AXIS SHIFTING INLAND
AND SOME SHORTWAVE ENERGY REACHING THE COAST...SO WILL ADD IN A
CHANCE OF RAIN FOR SUN AND MON.

AST 000111 PDX 000000 SLE 000000 EUG 000000

.PQR...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS CAPE SHOALWATER TO
        FLORENCE.