Forecast Discussion:
A Winter Storm Warning has been issued by the NWS for our forecast area. Please monitor the latest forecasts and warnings from the NWS. Air quality will be in the good range Wednesday with concentrations falling rapidly as strong northwest winds fill in late in the day.

Extended Forecast:
Good air quality continues Thursday with strong winds in the wake of the storm. Concentrations will rise a bit as winds weaken on Friday, and snow cover limits vertical mixing, but will remain in the good range. To follow air quality in PHL between forecasts: "aqforecast" at www.twitter.com -Ryan