SPECIAL WEATHER STATEMENT
Issue Date: 146 PM PST SAT DEC 5 2009
Expiration: 615 AM PST SUN DEC 06 2009
...VERY COLD WEATHER SWEEPING SOUTH TOWARD THE PACIFIC NORTHWEST...
AN ARCTIC FRONT CURRENTLY IN NORTHERN BRITISH COLUMBIA CONTINUES
TO DROP SOUTH ON ITS WAY TO THE PACIFIC NORTHWEST. THE COLD AIR
MASS WILL BEGIN FILTERING INTO WASHINGTON LATE TONIGHT THEN SPREAD
SOUTH ACROSS OREGON SUNDAY AND SUNDAY NIGHT. DAYTIME TEMPERATURES
WILL REMAIN IN THE 30S IN MOST AREAS OF THE WILLAMETTE VALLEY AND
CLARK COUNTY SUNDAY...BUT WILL STRUGGLE TO RISE ABOVE FREEZING ON
MONDAY. OVERNIGHT TEMPERATURES SUNDAY NIGHT WILL FALL INTO THE
TEENS AND TWENTIES ALONG WITH INCREASING EASTERLY WINDS.
SCATTERED SNOW SHOWERS ARE POSSIBLE IN THE CASCADES TONIGHT AND
SUNDAY AS THE ARCTIC FRONT PASSES OVERHEAD. THERE IS ALSO THE
CHANCE FOR SOME LIGHT SNOW IN THE VALLEYS. HOWEVER...GIVEN THE
LIMITED MOISTURE AVAILABLE...NO SIGNIFICANT ACCUMULATIONS ARE
EXPECTED.
WIND CHILL VALUES WILL DROP SIGNIFICANTLY SUNDAY NIGHT. IN THE
COLUMBIA GORGE...WHERE WIND GUSTS UP TO 50 MPH WILL COINCIDE WITH
TEMPERATURES IN THE UPPER TEENS TO LOWER 20S...WIND CHILL VALUES
WILL DROP TO NEAR ZERO AT TIMES. SIMILARLY...WIND CHILL VALUES IN
THE SINGLE DIGITS CAN BE EXPECTED IN SECTIONS OF THE PORTLAND
METRO AREA AND CLARK COUNTY NEAR THE GORGE. TEMPERATURES IN THE
CASCADES WILL BE IN THE SINGLE DIGITS WITH WIND CHILLS 10 TO 15
DEGREES BELOW ZERO AT THE PASSES AND RIDGES.
COLD DRY OFFSHORE FLOW WITH PERSISTENT EAST WINDS THROUGH THE
WESTERN GORGE WILL CONTINUE THROUGH MUCH IF NOT ALL OF THE
UPCOMING WEEK. PRECIPITATION CHANCES WILL GRADUALLY INCREASE FROM
THE SOUTH THURSDAY AND FRIDAY BUT AT THIS TIME IT APPEARS NEXT
WEATHER SYSTEM WILL MAKE LANDFALL WELL TO OUR SOUTH KEEPING THE
BRUNT OF ANY WINTERY PRECIPITATION OUT OF THE AREA.
HAZARDOUS WEATHER OUTLOOK
Issue Date: 538 AM PST SAT DEC 5 2009
Expiration: 600 AM PST SUN DEC 06 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
OREGON AND SOUTHWEST WASHINGTON.
.DAY ONE...TODAY AND TONIGHT
AREAS OF FREEZING FOG CAN BE EXPECTED IN SOME OF THE VALLEY
LOCATIONS THIS MORNING.
.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
COLD ARCTIC AIR WILL MOVE INTO THE AREA SUNDAY. TEMPERATURES IN
THE TEENS AND LOWER 20S SUNDAY NIGHT ALONG WITH GUSTY WINDS WILL
CREATE LOW WIND CHILLS IN SOME AREAS.
.SPOTTER INFORMATION STATEMENT...
SPOTTER REPORTS ARE NOT LIKELY TO BE NEEDED TODAY.
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