AIR STAGNATION ADVISORY
Issue Date: 945 AM PST SAT DEC 26 2009
Expiration: 1000 AM PST MON DEC 28 2009

...AIR STAGNATION ADVISORY NOW IN EFFECT UNTIL 10 AM PST MONDAY...
THE AIR STAGNATION ADVISORY IS NOW IN EFFECT UNTIL 10 AM PST
MONDAY.
* 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.
$$