000 
FXUS66 KPQR 182132
AFDPQR

NORTHWEST OREGON AND SOUTHWEST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
300 PM PDT WED JUL 18 2001

UPPER LEVEL DISTURBANCES OFFSHORE CONTINUE TO ROTATE AROUND THE LOW
CENTER ALOFT OVER ALBERTA CANADA AND MOVE INLAND ACROSS THE FORECAST
AREA. THE NEXT SHORTWAVE LOBE WILL MOVE INLAND ACROSS A MOIST AIR
MASS ON THURSDAY. PRIOR TO THAT MINOR POSITIVE VORTICITY AREAS WILL
RIPPLE ACROSS THE MOIST AIR MASS TO GENERATE WEAK SHOWER ACTIVITY.
CYCLONIC CURVATURE ALOFT AS THE UPPER LOW WOBBLES SOUTH THEN KICKS NE
CONTINUES A SHOWER THREAT ON FRIDAY AND LESS ON SATURDAY MAINLY IN
THE FAVORED OROGRAPHIC AREAS...THEN IT LOOKS LIKE A MORNING CLOUDS
AND PARTLY SUNNY AFTERNOON PATTERN WITH SEASONABLE TEMPERATURES AS A
VERY WEAK UPPER RIDGE APPROACHES THE COAST. THIS WILL BRING LIGHT
ONSHORE FLOW AND BUILDING HEIGHTS ALOFT. SIGNIFICANT PHASE
DIFFERENCES DEVELOP IN THE LONGER RANGE MODELS BUT APPEARS THAT THE
STORM TRACK WILL BE NORTH OF THE AREA IN ANY CASE. WILLSON

AST 3665  PDX 2665  SLE 2555  EUG 2555

.KPDX...NONE.