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Southwest PA Ozone/PM2.5 Forecast

Small map of Pennsylvania showing counties involved in the sw partnership.
Forecasted AQI for Ozone Air Quality Index Scale Forecasted AQI for PM2.5
May 22, 2015

 

Date: Friday, May 22, 2015
Action Day?:  No
Temperature: 65-70 Friday
Discussion:
Clouds and sunshine are expected on Friday, but brisk northwest winds bringing in clean and dry air will continue to keep ozone and fine particulate concentrations in the good range. A shower still cannot be ruled out. Afternoon temperatures reaching the middle to upper 60s. Clear and cold Friday night with the mercury dropping into the upper 30s in the colder spots.

Extended:
Saturday will start cold, but then temperatures will recover into the lower 70s in the afternoon. Very dry and clean air will continue to bring low levels of PM2.5 and ozone. As high pressure slides off the east coast Sunday into Memorial Day, a warming trend will begin, and there will also be a corresponding increase in ozone and PM2.5. How high ozone levels get early next week depends on how much afternoon convection there is, but at this point, chances for this convection are greatest Tuesday into Wednesday of next week. Warm and more humid air will send PM2.5 to moderate levels later Sunday and continue into early next week.---McAuliffe

 

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