Flash Flood Warning 1, NWS Portland, OR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
300 PM PDT WED AUG 25 2004

.SYNOPSIS...A COOL UNSTABLE AIR MASS OVER THE FORECAST AREA WILL
CONTINUE TO PRODUCE SHOWERS THROUGH THURSDAY IN A STRONG WESTERLY
FLOW ALOFT. A WEAK RIDGE OF HIGH PRESSURE WILL BUILD OVER THE AREA
FROM THE SOUTHWEST BEGINNING THURSDAY NIGHT. WEAK WEATHER SYSTEMS
WILL CONTINUE TO MOVE ACROSS THE TOP OF THIS RIDGE...STAYING NORTH OF
OUR FORECAST AREA THROUGH THE WEEKEND.
&&

.SHORT TERM...NATIONAL WEATHER SERVICE DOPPLER WEATHER RADAR SHOWS
SHOWERS CONTINUING TO SPREAD INTO THE FORECAST AREA THIS AFTERNOON.
IR SATELLITE IMAGERY SHOWS THE COLD AIR CU ENHANCING OVER THE
NORTHEAST PACIFIC AS IT APPROACHES THE WA/NORTHERN OREGON COASTS. NOT
SEEING ANY LIGHTNING STRIKES OVER THE CWA TODAY EVEN THOUGH
CONDITIONS ARE GOOD...MAY HAVE NEEDED A FEW MORE BREAKS IN THE CLOUDS
TO GET THE CONVECTION GOING. WILL END CHANCE OF THUNDERSTORMS EARLY
THIS EVENING AS THE ATMOSPHERE BEGINS TO STABILIZE. THE STRONG WLY
FLOW ALOFT WILL CONTINUE TO BRING SHOWERS TO THE AREA FOR THE
REMAINDER OF TONIGHT AND THURSDAY...WITH SHOWERS DIMINISHING LATE THU
NIGHT.

MODELS BUILD A FLAT RIDGE ALOFT OVER THE PACIFIC NORTHWEST THURSDAY
NIGHT/FRIDAY...WITH DRY WEATHER LIKELY BY FRIDAY. A SLOW WARMING
TREND WILL ENSUE BY THE END OF THE WEEK AS THE OFFSHORE FLOW SETS UP
AND 850MB TEMPS WARM INTO THE TEENS. LIKENS

.LONG TERM...MODELS AGAIN TODAY START OUT THE EXTENDED PERIOD IN
FAIRLY GOOD AGREEMENT...IN KEEPING A FLAT RIDGE OVER THE REGION IN
THE EARLY PART OF THE EXTENDED FORECAST WITH HIGH HEIGHTS. MODELS
CONTINUE TO HAVE WEAK SYSTEMS MOVING ACROSS THE TOP OF THIS RIDGE.
THE MODELS BEGIN TO DIVERGE AS WE PROGRESS INTO THE EXTENDED
PERIOD...AGAIN CREATING LOW CONFIDENCE IN THE DAY 6/7 TIME PERIOD.
WILL STAY THE COURSE AND CONTINUE THE DRY FORECAST INTO MID
WEEK...WITH SLIGHT COOLING TREND.

&&

.PRELIMINARY POINT POPS
AST 853111  PDX 853111  SLE 853111  EUG 843111
&&

.PQR WATCHES/WARNINGS/ADVISORIES...
.OR/WA...SMALL CRAFT ADVISORY CAPE SHOALWATER TO FLORENCE TONIGHT
         THROUGH THURSDAY

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PORTLAND OR
423 AM PDT WED AUG 25 2004

ORZ001>013-WAZ019>023-039-040-261200-
CASCADE FOOTHILLS IN LANE COUNTY-CASCADES IN LANE COUNTY-
CENTRAL COAST RANGE OF WESTERN OREGON-CENTRAL OREGON COAST-
CENTRAL WILLAMETTE VALLEY-COAST RANGE OF NORTHWEST OREGON-
GREATER PORTLAND METRO AREA-GREATER VANCOUVER AREA-LOWER COLUMBIA-
LOWER COLUMBIA AND I - 5 CORRIDOR IN COWLITZ COUNTY-
NORTH OREGON COAST-NORTHERN OREGON CASCADE FOOTHILLS-
NORTHERN OREGON CASCADES-SOUTH WILLAMETTE VALLEY-
SOUTH WASHINGTON CASCADE FOOTHILLS-SOUTH WASHINGTON CASCADES-
SOUTH WASHINGTON COAST-WESTERN COLUMBIA RIVER GORGE-WILLAPA HILLS-
423 AM PDT WED AUG 25 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWEST WASHINGTON AND
NORTHWEST OREGON.

.DAY ONE...TODAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.