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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
December 22, 2014

 

Date: Monday, December 22, 2014
Action Day?:  No
Temperature:  Upper 40s
Discussion:
On Monday, mostly cloudy skies will continue to prevail over the region as our area of high pressure begins to move out into the Atlantic. On the backside of the high, winds will turn more out of the south, allowing even warmer temperatures to build in. In fact, afternoon highs will peak in the upper 40s. At the same time, a storm system will push into the northern Plains. This system will impact us later in the week. In the meantime, expect the influx of warm and moist air into the area to keep the environment ripe for elevated PM 2.5 levels.

Extended:
As we take a peek into this week, we notice that week will start off on the unseasonably warm side. This will begin on Monday as an area of high pressure, which had been slowly moving east across the Northeastern US over the weekend, finally pushes out to sea. A new storm system over the Plains will take its place. This will set the stage for influx of warmer air for our area thanks to a wind switch out of the south. As the storm system from the Plains moves east, it will combine with a weak system over the southeastern US and create a very strong system over the Great Lakes. The intensity of the winds will be a direct correlation of how strong this system becomes. A lot of warm air will move northward in advance of this system. In fact, we could eclipse the 60 degree mark on Tuesday as the rain threat increases. It appears to be a very wet Wednesday as a cold front associated with this system pushes through our area. In comparison, Christmas Day will see temperatures fall back to normal as a strong storm system rotates over the Great Lakes. These temperatures are likely to be short-lived though as yet another storm system begins to take shape over Plains. Overall, due to the volatility in the weather beginning early in the week, air quality levels are expected to fall back into the good range after staying the weekend in the moderate category. --Nolan

 

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