HAZARDOUS WEATHER OUTLOOK
Issue Date: 304 PM PST WED DEC 23 2009
Expiration: 515 AM PST THU DEC 24 2009 Expires:200912241315;;
FLUS46 KPDT 232257 AAA
HWOPDT
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
258 PM PST WED DEC 23 2009
UPDATED TO MENTION AIR STAGNATION ADVISORY.
ORZ041>044-049-050-501>506-WAZ024-026>030-501-502-241315-
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-
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-
EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON-
EAST SLOPES OF THE SOUTHERN CASCADES OF WASHINGTON-
258 PM PST WED DEC 23 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.
.DAY ONE...TODAY AND TONIGHT
THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.
DRY CONDITIONS ARE EXPECTED REGION-WIDE TODAY EXCEPT FOR LIGHT
FLURRIES IN THE EASTERN OREGON MOUNTAINS. IT WILL BE SEVERAL
DEGREES COLDER TODAY COMPARED TO YESTERDAY. WINDS WILL BE LIGHT.
.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY
THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.
A COLD AND VERY STABLE AIR MASS WILL RESIDE EAST OF THE CASCADES
THURSDAY THROUGH THE END OF THE WEEK. AN INVERSION WILL DEVELOP OVER
THE REGION AND AN AIR STAGNATION ADVISORY HAS BEEN ISSUED FOR MUCH
OF THE FORECAST AREA BELOW 3500 FEET FROM THURSDAY MORNING THROUGH
SATURDAY AFTERNOON. SEE PRODUCT PDXNPWPDT FOR FURTHER DETAILS.
FREEZING FOG WILL BE PATCHY ON CHRISTMAS EVE IN THE COLUMBIA BASIN
AND CENTRAL OREGON BUT WILL INCREASE IN AREAL COVERAGE BY SATURDAY.
THE STRONG HIGH PRESSURE RIDGE WILL EVENTUALLY WEAKEN AND ALLOW
PACIFIC MOISTURE TO SPREAD ACROSS THE AREA EARLY NEXT WEEK FOR A
SLIGHT CHANCE TO A CHANCE OF WINTER PRECIPITATION.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.
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.
$$
AIR STAGNATION ADVISORY
Issue Date: 225 PM PST WED DEC 23 2009
Expiration: 400 PM PST SAT DEC 26 2009 ...AIR STAGNATION ADVISORY IN EFFECT FROM 4 AM THURSDAY TO 4 PM
PST SATURDAY...
THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED AN AIR
STAGNATION ADVISORY...WHICH IS IN EFFECT FROM 4 AM THURSDAY TO
4 PM PST SATURDAY.
* AIR QUALITY: WILL DETERIORATE IN VALLEYS AND BASINS DUE TO HIGH
PRESSURE LIMITING AIR MOVEMENT. THIS WILL CAUSE THE ACCUMULATION
OF PARTICULATE MATTER IN VALLEYS AND BASINS MAINLY BELOW 3500
FEET.
* IMPACTS: POOR AIR QUALITY WILL AFFECT PERSONS WITH RESPIRATORY
PROBLEMS AND PERSONS ENGAGED IN STRENUOUS OUTDOOR ACTIVITIES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT
OF AN AIR MASS ACROSS THE ADVISORY AREA...POLLUTION WILL INCREASE.
CHECK WITH YOUR LOCAL AIR QUALITY AGENCY FOR POSSIBLE
RESTRICTIONS IN YOUR AREA. FOR ADDITIONAL WEATHER INFORMATION...
CHECK OUR WEBSITE AT WWW.WEATHER.GOV/PENDLETON.
$$
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