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One product issued by NWS for:

Air Stagnation Advisory

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE PENDLETON OR
1034 AM PST THU NOV 20 2014

...STAGNANT CONDITIONS THROUGH FRIDAY MORNING...

.INVERSIONS DUE TO HIGH PRESSURE OVER THE REGION WILL RESULT IN
STAGNANT AIR BEING TRAPPED ACROSS THE LOWER ELEVATIONS.

ORZ041-044-050-505-507-508-510-511-WAZ024-026>029-521-211200-
/O.CON.KPDT.AS.Y.0002.000000T0000Z-141121T2000Z/
EAST COLUMBIA RIVER GORGE OF OREGON-
LOWER COLUMBIA BASIN OF OREGON-WALLOWA COUNTY-JOHN DAY BASIN-
FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON-
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON-
NORTH CENTRAL OREGON-CENTRAL OREGON-
EASTERN COLUMBIA RIVER GORGE OF WASHINGTON-KITTITAS VALLEY-
YAKIMA VALLEY-LOWER COLUMBIA BASIN OF WASHINGTON-
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON-SIMCOE HIGHLANDS-
INCLUDING THE CITIES OF...ARLINGTON...THE DALLES...BOARDMAN...
HERMISTON...IONE...ENTERPRISE...JOSEPH...WALLOWA...DAYVILLE...
JOHN DAY...MITCHELL...MONUMENT...SPRAY...PENDLETON...PILOT ROCK...
HEPPNER...CONDON...FOSSIL...DUFUR...MAUPIN...BEND...MADRAS...
PRINEVILLE...REDMOND...WHITE SALMON...ELLENSBURG...THORP...
NACHES...SUNNYSIDE...TOPPENISH...YAKIMA...CONNELL...PROSSER...
TRI-CITIES...DAYTON...WAITSBURG...WALLA WALLA...GOLDENDALE
1034 AM PST THU NOV 20 2014

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST
FRIDAY...

AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST
FRIDAY.

* TIMING: STAGNANT AIR CONDITIONS WILL LAST THROUGH FRIDAY
  MORNING.

* IMPACTS: THE INVERSION WILL TRAP POLLUTANTS NEAR THE SURFACE
  WHICH CAN IMPACT THOSE WITH RESPIRATORY CONDITIONS.

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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