HAZARDOUS WEATHER OUTLOOK
Issue Date: 510 AM 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...TODAY AND TONIGHT
STRONG WIND
GRANDE RONDE VALLEY
A TIGHT SOUTH TO NORTH PRESSURE GRADIENT IS CAUSING STRONG WINDS IN
THE SOUTHERN GRANDE RONDE VALLEY THIS MORNING. WINDS OF 30 TO 40 MPH
WITH GUSTS TO NEAR 50 MPH HAVE BEEN REPORTED IN THE SOUTH END OF THE
VALLEY NEAR THE BASE OF LADD AND PYLES CANYONS EARLY THIS MORNING.
AS A RESULT A WIND ADVISORY IS NOW IN EFFECT FOR THE SOUTHERN GRANDE
RONDE VALLEY...MAINLY NEAR THE BASE OF LADD AND PYLES CANYONS...
THROUGH 10 AM THIS MORNING. THE WINDS WILL DECREASE AND SHIFT TO THE
NORTHWEST LATER THIS AFTERNOON AND TONIGHT AS A COLD FRONT PUSHES
SOUTHWARD ACROSS THE AREA. PLEASE REFER TO NWS PRODUCT ID PDXNPWPDT
FOR MORE DETAILS.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY
SNOW SATURDAY
NORTHWEST BLUE MOUNTAINS, NORTHERN BLUE MOUNTAINS OF OREGON
EXTREME COLD SUNDAY
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
EXTREME COLD MONDAY
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
EXTREME COLD 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: 335 PM PST THU DEC 3 2009
Expiration: 400 PM PST FRI DEC 04 2009
...SIGNIFICANTLY COLDER TEMPERATURES WILL 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 THE POSSIBILITY 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 UNTIL 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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