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Southeast PA Ozone/PM2.5 Forecast

Small map of Pennsylvania showing counties involved in the se partnership.
Forecasted AQI for Ozone Air Quality Index Scale Forecasted AQI for PM2.5
August 2, 2014

 

Date: Saturday, August 2, 2014
Action Day?:  No
Discussion:
A frontal boundary will be draped along the Atlantic coast on Saturday. Waves of low pressure will travel along the front, spreading rain over the Philadelphia metropolitan area from south to north. The period of heaviest rain will occur overnight into the morning. Onshore (easterly) flow will bring clean maritime air into the area, as well. Given the overcast skies, periods of heavy rain, and onshore winds, air quality will be well inside the Good range.

Extended:
There is uncertainty in the forecast for Sunday and Monday. It is not clear how quickly the coastal front will move off to the east, bringing an end to cloudy skies and scattered rain showers. For now, Sunday is trending towards being drier, especially in the afternoon, while Monday will be partly sunny as surface high pressure arrives from the west. Very light to calm winds both days will promote rising pollutant concentrations. Thus, a general upward trend in air quality is expected, with both ozone and particles reaching the Good/Moderate threshold on Sunday and the Moderate range on Monday. If clouds and rain linger, another day of Good air quality will occur on Sunday. -Huff

 

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