Last update: 11.08.09 - Sun - 08:56:46 PM (EST)
Current Watches, Warnings and Advisories for Pennsylvania
Issued by the National Weather Service
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List of Active Alerts by County
Allegheny
air quality alert
Air Quality Alert
Allegheny (Pennsylvania)
PAZ021-100130- ALLEGHENY- INCLUDING THE CITY OF...PITTSBURGH METRO AREA 217 PM EST SUN NOV 8 2009 ...AIR QUALITY ALERT IS IN EFFECT FROM 12 AM MONDAY UNTIL 11 PM MONDAY... THE PENNSYLVANIA DEPARTMENT OF ENVIRONMENTAL PROTECTION HAS ISSUED AN AIR QUALITY ACTION DAY FOR THE FOLLOWING COUNTIES... ALLEGHENY. THE AIR QUALITY ACTION DAY HAS BEEN ISSUED FOR THE LIBERTY-CLAIRTON AREA. THANKS TO THE HIGH PRESSURE SYSTEM WHICH HAS BEEN IN CONTROL OF OUR WEATHER FOR THE PAST COUPLE OF DAYS...WE HAVE SEEN AN UNSEASONABLY WARM AIR MASS MOVE IN OVER THE REGION. WITH WARM AIR MOVING IN ALOFT AND WITH CLEAR SKIES OVERNIGHT AN INVERSION SHOULD FORM OVER THE REGION DURING THE MORNING HOURS. THIS INVERSION ALONG WITH LIGHT SOUTHERLY FLOW AT THE SURFACE WILL ALLOW FINE PARTICULATE LEVELS TO RISE DURING THE MORNING HOURS. MORE MIXING IN THE AFTERNOON WILL FORCE FINE PARTICULATE LEVELS TO FALL SOMEWHAT BUT NOT BEFORE AVERAGING THE DAY IN THE CODE ORANGE RANGE. $$Issuing Weather Forecast Office Homepage
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