AIR STAGNATION ADVISORY
Warning Issue Date: 357 AM PST FRI DEC 25 2009
AIR STAGNATION ADVISORY REMAINS IN EFFECT FOR MOST OF THE
INTERIOR LOWLANDS OF WESTERN WASHINGTON UNTIL 10 AM PST
SATURDAY...
STRONG HIGH PRESSURE ALOFT WILL PERSIST OVER THE REGION FOR THE
NEXT COUPLE OF DAYS...TRAPPING COLD AIR NEAR THE SURFACE UNDER
WARM AIR ALOFT. THE RESULTING LOW LEVEL TEMPERATURE INVERSION
ALONG WITH LIGHT SURFACE WINDS WILL ALLOW POLLUTANTS LIKE WOOD
SMOKE AND VEHICLE AND INDUSTRIAL EMISSIONS TO
ACCUMULATE...DEGRADING AIR QUALITY.
WINDS WILL PREVENT STAGNATION ALONG THE COAST...THE STRAIT OF
JUAN DE FUCA AND ALSO ACROSS THE SAN JUAN ISLANDS. THE OLYMPICS
AND CASCADES 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 TO DEVELOP
TODAY THROUGH SATURDAY. A PERIOD OF IMPROVED AIR
QUALITY IS EXPECTED NEAR THE CASCADE FOOTHILLS...EAST PUGET SOUND
LOWLANDS...AND SOME OTHER AREAS FROM KING COUNTY NORTHWARD. THE
SOUTH PUGET SOUND AND SOUTHWEST INTERIOR WILL LIKELY REMAIN
STAGNATE INTO SATURDAY MORNING. CONTINUE TO MONITOR THE LATEST
FORECASTS.
CHECK WITH YOUR LOCAL AIR QUALITY AGENCY FOR POSSIBLE
RESTRICTIONS IN YOUR AREA.
$$
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