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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
October 25, 2014

 

Date: Saturday, October 25, 2014
Action Day?:  No
Temperature:  Low to Mid 60s
Discussion:
On Saturday, partly sunny skies will persist over the region as the area of high pressure, which was off to our west on Friday, drops off to our south and east. At the same time, another weak cold front will begin to push in over the Great Lakes. As a result of these two systems, the winds are expected to turn more southwesterly. The winds will increase in magnitude during the afternoon hours as the high moves away from our area and the cold front approaches. The southwesterly flow will help keep temperatures slightly above normal, with afternoon highs peaking in the low to mid 60s. Air quality levels will also stay elevated. The light flow in the morning will be conducive for an inversion to form. Therefore, expect the highest PM 2.5 levels to persist in the morning hours. Once the inversion breaks and the winds increase, expect PM 2.5 levels to drop, but not low enough to force PM 2.5 levels out of the moderate range.

Extended Forecast

Date

10/25/2014

10/26/2014

10/27/2014

Ozone

WHITE

WHITE

WHITE

PM

YELLOW

GREEN

YELLOW


Extended:
As we take a peek into next week, we notice that the week will start off pleasant, thanks in part to a new area of high pressure building in over the eastern US. After a brief cool snap on Sunday, an area of high pressure will extend eastward across the East Coast. As it does, the winds over our area will swing out of the southwest, allowing warmer and more humid air into the region. As a result, highs for the first couple days of the work week will be in the 70s. Air quality should follow suit and rise back into the moderate range due to a more modified air mass building in from the west. Toward the middle of the week, the first of two frontal systems will press through the region. The first front, slated to push through on Wednesday, will provide a shower or two before moving off to our east. A cooler and drier air mass will build back into the region. A second frontal system will push in just in time for the weekend and provide a reinforcing shot of cool and dry air for western PA. Needless to say, expect PM 2.5 levels to drop back into the good category during this period. --Nolan

 

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