AIR STAGNATION ADVISORY
Warning Issue Date: 436 AM PST SAT DEC 26 2009
WAZ503-504-506-507-510>512-261800-
/O.CON.KSEW.AS.Y.0003.000000T0000Z-091226T1800Z/
WESTERN WHATCOM COUNTY-SOUTHWEST INTERIOR-WESTERN SKAGIT COUNTY-
EVERETT AND VICINITY-ADMIRALTY INLET AREA-HOOD CANAL AREA-
LOWER CHEHALIS VALLEY AREA-
435 AM PST SAT DEC 26 2009
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING...
AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING.
* STRONG HIGH PRESSURE ALOFT WILL PERSIST OVER THE REGION TODAY.
THIS WILL TRAP COLD AIR NEAR THE SURFACE UNDER WARM AIR ALOFT.
* THE RESULTING LACK OF MIXING WILL ALLOW POLLUTANTS SUCH AS
WOOD SMOKE AND INDUSTRIAL EMISSIONS TO ACCUMULATE AND REDUCE
AIR QUALITY.
* THE MOST LIKELY PLACES TO EXPERIENCE REDUCED AIR QUALITY ARE
ALONG THE I-5 CORRIDOR OF SNOHOMISH...THURSTON...AND PIERCE
COUNTIES.
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. CHECK
WITH YOUR LOCAL AIR QUALITY AGENCY FOR POSSIBLE RESTRICTIONS IN
YOUR AREA.
$$
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