AIR STAGNATION ADVISORY
Warning Issue Date: 438 PM PST FRI DEC 25 2009
AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
SATURDAY...
AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
SATURDAY.
STRONG HIGH PRESSURE ALOFT WILL PERSIST OVER THE REGION THROUGH
SATURDAY...TRAPPING COLD AIR NEAR THE SURFACE UNDER WARM AIR
ALOFT. THE RESULTING LACK OF ATMOSPHERIC VENTILATION WILL ALLOW
POLLUTANTS LIKE WOOD SMOKE AND VEHICLE AND INDUSTRIAL EMISSIONS
TO ACCUMULATE...DEGRADING AIR QUALITY. THE MOST LIKELY PLACES TO
EXPERIENCE REDUCED AIR QUALITY ARE ALONG THE I-5 CORRIDOR OF
THURSTON AND PIERCE COUNTIES.
WINDS WILL PREVENT STAGNATION ALONG THE COAST...THE STRAIT OF
JUAN DE FUCA AND ALSO ACROSS THE SAN JUAN ISLANDS. THE OLYMPIC
AND CASCADE MOUNTAINS WILL ALSO BE ABOVE THE STAGNANT INVERSION
LAYER. THEREFORE THESE AREAS ARE NOT INCLUDED IN THE ADVISORY.
GAP WINDS THROUGH THE CASCADE PASSES ARE EXPECTED THROUGH
SATURDAY. AS A RESULT...GOOD AIR QUALITY IS EXPECTED NEAR THE
CASCADE FOOTHILLS...EAST PUGET SOUND LOWLANDS... AND SOME OTHER
AREAS FROM KING COUNTY NORTHWARD.
CHECK WITH YOUR LOCAL AIR QUALITY AGENCY FOR POSSIBLE
RESTRICTIONS IN YOUR AREA.
$$
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