AIR STAGNATION ADVISORY
Issue Date: 242 PM PST THU DEC 24 2009
Expiration: 600 PM PST SAT DEC 26 2009

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 6 PM PST
SATURDAY FOR NORTHERN CLARK COUNTY AND COWLITZ VALLEY...
AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 6 PM PST
SATURDAY.
OFFSHORE FLOW OVER THE REGION WILL STRENGTHEN LATER TONIGHT AND
CONTINUE INTO THE SATURDAY. HOWEVER...STRONG LOW LEVEL INVERSIONS
WILL KEEP AREAS BELOW 1500 FEET FROM MIXING WELL. THIS WILL LEAD
TO AIR QUALITY THAT WILL GRADUALLY BECOME MORE POOR WITH TIME.
DEPENDING ON THE STRENGTH OF THE EAST WINDS...IT IS POSSIBLE THAT
CONDITIONS MAY BRIEFLY IMPROVE AT TIMES...BUT ONLY BRIEFLY.
EAST WINDS OVER SOUTHERN CLARK COUNTY WILL BE STRONG ENOUGH TO
KEEP AREAS MIXED...WITH NO SIGNIFICANT AIR QUALITY CHANGE.
* AREAS AFFECTED...ACROSS NORTHERN CLARK COUNTY...EXTENDING
  NORTH THROUGH THE COWLITZ VALLEY.
* TIMING...NOW THROUGH SATURDAY.
* AIR QUALITY...EXPECT SLOWLY DEGRADING AIR QUALITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
AN AIR STAGNATION ADVISORY IS ISSUED WHEN LOCALLY ESTABLISHED
CRITICAL VALUES OF TRANSPORT WINDS...MIXING HEIGHT...AND
VENTILATION ARE EXPECTED TO PERSIST FOR AT LEAST 72 HOURS. THIS
PRODUCT WILL BE UPDATED AT LEAST EVERY 24 HOURS WHEN CONDITIONS
EXIST OR ARE EXPECTED TO CONTINUE.
&&
$$

HAZARDOUS WEATHER OUTLOOK
Issue Date: 1141 AM PST THU DEC 24 2009
Expiration: 1145 AM PST FRI DEC 25 2009

Expires:200912251945;;
FLUS46 KPQR 241940
HWOPQR
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PORTLAND OR
1140 AM PST THU DEC 24 2009
ORZ001>014-WAZ019>023-039-040-251945-
NORTH OREGON COAST-CENTRAL OREGON COAST-
COAST RANGE OF NORTHWEST OREGON-
CENTRAL COAST RANGE OF WESTERN OREGON-LOWER COLUMBIA-
GREATER PORTLAND METRO AREA-CENTRAL WILLAMETTE VALLEY-
SOUTH WILLAMETTE VALLEY-WESTERN COLUMBIA RIVER GORGE-
NORTHERN OREGON CASCADE FOOTHILLS-NORTHERN OREGON CASCADES-
CASCADE FOOTHILLS IN LANE COUNTY-CASCADES IN LANE COUNTY-
UPPER HOOD RIVER VALLEY-SOUTH WASHINGTON CASCADES-WILLAPA HILLS-
SOUTH WASHINGTON COAST-I-5 CORRIDOR IN COWLITZ COUNTY-
GREATER VANCOUVER AREA-SOUTH WASHINGTON CASCADE FOOTHILLS-
1140 AM PST THU DEC 24 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
OREGON AND SOUTHWEST WASHINGTON.
.DAY ONE...THIS AFTERNOON AND TONIGHT
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED.
$$