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.
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