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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
March 29, 2015

 

Date: Sunday, March 29, 2015
Action Day?:  No
Temperature: lower to middle 40s Sunday
Discussion:
High pressure over the Mid-Atlantic region on Sunday will shift winds into more of a westerly direction, but mixing should be such that fine particulate does not rise significantly. Afternoon temperatures recovering into the lower to middle 40s thanks to increasing late March sun strength. *** Monday's forecast: A snow shower will start the day on Monday, with some sunshine returning in the afternoon. Robust west to northwest flow again will prevent PM2.5 from going into the moderate range. High temperatures mainly in the middle to upper 40s.

Extended Forecast

Date

3/29/2015

3/30/2015

Ozone

WHITE

WHITE

PM

GREEN

GREEN


Extended:
Springlike swings in temperatures are likely during the extended period. A weak area of low pressure moving to our north can bring a rain or snow shower early Tuesday, then high pressure builds in during the middle of the week with warmer air coming back in. PM levels will start the period in the good range, but then winds shift into more of a south to southwest direction in the middle of the week and bring in warmer and more humid air, so moderate concentrations are more likely by Wednesday and Thursday. A cold front will then bring in some showers by week's end.--McAuliffe

 

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