AIR STAGNATION ADVISORY
Warning Issue Date: 742 AM PST THU DEC 24 2009
AIR STAGNATION ADVISORY REMAINS IN EFFECT FOR MOST THE INTERIOR
LOWLANDS OF WESTERN WASHINGTON UNTIL 10 AM PST SATURDAY...
FORECAST GUIDANCE INDICATES STRONG HIGH PRESSURE ALOFT WILL
PERSIST OVER THE REGION...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 OVER THE NEXT COUPLE DAYS.
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
FRIDAY. THE WINDS ON FRIDAY COULD BE STRONG ENOUGH TO IMPROVE
POLLUTION LEVELS NEAR THE FOOTHILLS AND PORTIONS OF THE EAST
PUGET SOUND LOWLANDS. A PERIOD OF IMPROVED AIR QUALITY IS
POSSIBLE IN THESE AREAS. CONTINUE TO MONITOR THE LATEST
FORECASTS.
CHECK WITH YOUR LOCAL AIR QUALITY AGENCY FOR POSSIBLE
RESTRICTIONS IN YOUR AREA.
$$
MERCER
WEATHER.GOV/SEATTLE
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