PA Ozone/PM2.5 Forecast
September 17, 2014
Date: Wednesday, September 17, 2014
Wednesday will be a pleasant autumn day, with mostly sunny skies and near average temperatures. Surface winds will be light as the center of surface high pressure moves overhead. Light to calm winds will promote the accumulation of pollutants, but with a clean and dry air mass in place, air quality will remain in the Good range.
A weak cold front will approach from the north on Thursday and pass through Philadelphia in the afternoon. Little to no precipitation is expected with this front, due to the relatively low atmospheric humidity. Light to calm winds in the morning will pick up and turn northerly in the afternoon with the passage of the front. Another day with light winds and sunny skies will allow ozone and particles to rebound slightly, but the relatively clean air mass will keep air quality in the upper Good range. On Friday, a reinforcing shot of cool and dry air will build in, with breezy onshore winds and Good air quality.
Go to the new Air Quality Partnership of the Delaware Valley web site!