HAZARDOUS WEATHER OUTLOOK
Issue Date: 520 PM PST FRI DEC 4 2009
Expiration: 500 AM PST SAT DEC 05 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.
.DAY ONE...TONIGHT
THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.
A WEAK COLD FRONT WILL SWING THROUGH THE AREA...BRINGING ISOLATED TO
SCATTERED SNOW SHOWERS. SNOW ACCUMULATIONS WILL BE LIGHT.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY
SNOW SATURDAY
NORTHWEST BLUE MOUNTAINS, NORTHERN BLUE MOUNTAINS OF OREGON
EXTREME COLD SUNDAY THROUGH TUESDAY
EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON, EAST SLOPES
OF THE SOUTHERN CASCADES OF WASHINGTON, EASTERN COLUMBIA RIVER
GORGE OF WASHINGTON, KITTITAS VALLEY, YAKIMA VALLEY, LOWER
COLUMBIA BASIN OF WASHINGTON, FOOTHILLS OF THE BLUE MOUNTAINS
OF WASHINGTON, NORTHWEST BLUE MOUNTAINS, EASTERN COLUMBIA
RIVER GORGE OF OREGON, NORTH CENTRAL OREGON, CENTRAL OREGON,
LOWER COLUMBIA BASIN OF OREGON, GRANDE RONDE VALLEY, WALLOWA
COUNTY, FOOTHILLS OF THE BLUE MOUNTAINS OF OREGON, NORTHERN
BLUE MOUNTAINS OF OREGON, SOUTHERN BLUE MOUNTAINS OF OREGON,
NORTHERN WHEELER AND SOUTHERN GILLIAM COUNTIES, JOHN DAY
BASIN, OCHOCO-JOHN DAY HIGHLANDS
AN ARCTIC COLD FRONT WILL MOVE ACROSS THE REGION ON SUNDAY WITH VERY
COLD AIR BEHIND IT WHICH WILL SETTLE OVER THE AREA AND PERSIST ON
MONDAY AND TUESDAY. THIS WILL BE THE COLDEST AIR OF THE SEASON SO
FAR FOR EASTERN OREGON AND SOUTHEAST WASHINGTON WITH TEMPERATURES
NOT GETTING ABOVE FREEZING FOR SEVERAL DAYS IN ALL AREAS.
IN ADDITION THERE WILL BE SOME MOISTURE TO CAUSE SOME LIGHT SNOW
ACCUMULATION WITH THE COLD FRONT...MAINLY IN THE MOUNTAINS...BUT
THERE MAY ALSO BE A LIGHT COATING TO AN INCH OF SNOW IN THE LOWER
ELEVATIONS AS WELL LATE SUNDAY INTO MONDAY. THE AIR MASS WILL BEGIN
TO MODERATE AND SLOWLY WARM BACK UP DURING THE SECOND HALF OF NEXT
WEEK AS THE FLOW ALOFT BECOMES NORTHWEST AND THEN WESTERLY AGAIN.
THERE IS A POTENTIAL FOR A MIXED WINTER PRECIPITATION EVENT LATER
NEXT WEEK AS WARMER MOIST AIR IS PUSHED UP AND OVER THE DOME OF
ARCTIC AIR THAT WILL BE IN PLACE OVER THE REGION. THAT SITUATION
WILL BE MONITORED CLOSELY.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUIRED.
WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
GRAPHICAL FORECASTS OF WEATHER HAZARDS OUT TO SEVEN DAYS
ARE DISPLAYED ON THE WORLD WIDE WEB AT:
WWW.WRH.NOAA.GOV/PDT/CURRENTHAZARDS/HWO.HTML
ALL LETTERS IN THE ABOVE URL ARE LOWER CASE...EXCEPT THE H IN
CURRENTHAZARDS.
SPECIAL WEATHER STATEMENT
Issue Date: 319 PM PST FRI DEC 4 2009
Expiration: 700 AM PST SAT DEC 05 2009
...SIGNIFICANTLY COLDER TEMPERATURES CAN BE EXPECTED LATE THIS
WEEKEND INTO NEXT WEEK...
AN ARCTIC AIR MASS WILL INVADE THE PACIFIC NORTHWEST LATE THIS
WEEKEND...AND REMAIN OVER THE AREA THROUGH THE MIDDLE OF NEXT
WEEK. HIGH AND LOW TEMPERATURES WILL BE 15 TO 20 DEGREES BELOW
NORMAL...WITH THE COLDEST OF THESE DAYS EXPECTED TO BE SUNDAY
THROUGH TUESDAY. ALL AREAS CAN EXPECT A CHANCE OF SNOW SHOWERS FROM
TIME TO TIME...AS TEMPERATURES WILL STRUGGLE TO REACH FREEZING AT
BEST IN THE LOWER ELEVATIONS. COLD AIR TRAPPED IN THE COLUMBIA
BASIN AND SURROUNDING VALLEYS WILL LIKELY PERSIST THROUGH THE
LATER PART OF NEXT WEEK...WHEN THE NEXT WEATHER SYSTEM IS EXPECTED TO
ARRIVE. PLEASE MONITOR THE LATEST FORECASTS AND STATEMENTS FROM
THE NATIONAL WEATHER SERVICE OR YOUR LOCAL MEDIA OUTLETS FOR MORE
DETAILED INFORMATION.
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