HAZARDOUS WEATHER OUTLOOK
Issue Date: 619 AM PST THU DEC 10 2009
Expiration: 630 AM PST FRI DEC 11 2009

Expires:200912111430;;
FLUS46 KPQR 101418
HWOPQR
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PORTLAND OR
618 AM PST THU DEC 10 2009
ORZ001>014-WAZ019>023-039-040-111430-
NORTH OREGON COAST-CENTRAL OREGON COAST-
COAST RANGE OF NORTHWEST OREGON-
CENTRAL COAST RANGE OF WESTERN OREGON-LOWER COLUMBIA-
GREATER PORTLAND METRO AREA-CENTRAL WILLAMETTE VALLEY-
SOUTH WILLAMETTE VALLEY-WESTERN COLUMBIA RIVER GORGE-
NORTHERN OREGON CASCADE FOOTHILLS-NORTHERN OREGON CASCADES-
CASCADE FOOTHILLS IN LANE COUNTY-CASCADES IN LANE COUNTY-
UPPER HOOD RIVER VALLEY-SOUTH WASHINGTON CASCADES-WILLAPA HILLS-
SOUTH WASHINGTON COAST-I-5 CORRIDOR IN COWLITZ COUNTY-
GREATER VANCOUVER AREA-SOUTH WASHINGTON CASCADE FOOTHILLS-
618 AM PST THU DEC 10 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
OREGON AND SOUTHWEST WASHINGTON.
.DAY ONE...TODAY AND TONIGHT
HIGHS WILL ONCE AGAIN STRUGGLE TO MAKE IT MUCH ABOVE FREEZING FOR
MUCH OF THE INTERIOR TODAY. THIS WILL BE FOLLOWED BY INLAND LOWS
DROPPING BACK INTO THE UPPER TEENS AGAIN TONIGHT.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY
INLAND...ON FRIDAY NIGHT AND SATURDAY...THERE IS A POSSIBILITY
THAT FROZEN PRECIPITATION WILL FALL TO THE VALLEY FLOOR AS A
DISTURBANCE LIFTS NORTH ACROSS THE DISTRICT. DETAILS CONCERNING
EXACT TIMING AND ANY ACCUMULATIONS ARE STILL UNCERTAIN AT THIS TIME.
THIS SYSTEM WILL EVENTUALLY SCOUR OUT THE COLD AIR FROM THE VALLEY
LATER SATURDAY AS IT MOVES PAST THE REGION.
.SPOTTER INFORMATION STATEMENT...
WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
$$

SPECIAL WEATHER STATEMENT
Issue Date: 357 AM PST THU DEC 10 2009
Expiration: 300 PM PST THU DEC 10 2009

...VERY COLD WEATHER WILL CONTINUE THIS WEEK OVER THE PACIFIC
NORTHWEST WITH A POSSIBILITY OF LIGHT WINTRY PRECIPITATION THIS
WEEKEND...
A MODIFIED ARCTIC AIR MASS OVER SOUTHWEST WASHINGTON AND NORTHWEST
OREGON WILL CONTINUE THIS WEEK. DAYTIME HIGH TEMPERATURES FOR THE
INLAND VALLEYS ARE EXPECTED TO REMAIN NEAR FREEZING TODAY...WHILE
NIGHTTIME LOWS WILL AGAIN DROP INTO THE TEENS. MINIMUMS SHOULD BE
SLIGHTLY WARMER THURSDAY NIGHT...BUT ONLY BY A FEW DEGREES. THE
ONE EXCEPTION WILL BE THE WESTERN COLUMBIA RIVER GORGE...AND AREAS
NEAR THERE. EAST WINDS THROUGH THE GORGE AND INTO AREAS LIKE
TROUTDALE AND GRESHAM WILL KEEP TEMPERATURES FROM DROPPING QUITE
AS LOW.
A GRADUAL WARMING TREND WILL DEVELOP BEGINNING FRIDAY AND CONTINUE
INTO THE WEEKEND AS MODEL GUIDANCE CONTINUES TO INDICATE A
TRANSITION OUT OF THE ARCTIC AIR MASS. THE NORTHERN EDGE OF A
PACIFIC WEATHER SYSTEM IS EXPECTED TO PUSH INTO THE REGION FRIDAY
NIGHT AND SATURDAY...AND MAY BRING A WINTRY MIX TO THE WILLAMETTE
VALLEY. PRECIPITATION WOULD MOST LIKELY START AS SNOW...THEN
TRANSITION FROM SNOW TO FREEZING RAIN.
THERE IS STILL A LOT OF UNCERTAINTY WITH THE TRACK OF THIS
SYSTEM...A SOUTHERLY TRACK WILL KEEP US COOLER AND DRIER WHILE A
NORTHERLY TRACK MAY BRING MORE OF THE WINTRY PRECIPITATION INTO
THE NORTHERN PARTS OF THE WILLAMETTE VALLEY.
$$