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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
April 24, 2014

 

Date: Thursday, April 24, 2014
Action Day?:  No
Temperature:  Low 60s
Discussion:
On Thursday, mostly sunny skies will prevail during the day as the area of high pressure, which was over the Great Lakes on Wednesday, moves east toward our area. Winds will continue to reside out of the north, but should die down as the high moves in overhead. Temperatures will rise into the low 60s thanks to the abundant sunshine. However, the air mass will remain dry. It is this dryness that will help confine PM 2.5 levels to the good category.

Extended:
Over the coming days, expect to see temperatures stay seasonably warm early on. Over the weekend, though, temperatures are expected to cool thanks to the passage of a cold front through the region. As the front passes through, expect rain to move through the region. Once the front moves off to our east, winds will shift northerly and allow the cooler temperatures to arrive. Expect these temperatures to remain cool right through Monday. Temperatures will begin to rebound on Tuesday just as a new storm system begins to take shape over the Midwest / Ohio Valley region. This system is expected to be a slow mover, resulting in lingering rain for several days. All of the rain should fizzle by the start of the weekend as our storm system dies over the Great Lakes / Northeastern US. Overall, air quality levels during the period are expected to remain in the good range primarily. The cloud cover and rain will limit ozone formation while the constantly changing air masses will limit PM 2.5's ability to rise. --Nolan

 

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