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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 21, 2014

 

Date: Sunday, December 21, 2014
Action Day?:  No
Temperature:  Low 40s
Discussion:
On Sunday, mostly cloudy skies will once again be the rule as the area of high pressure (we have been contending with the past couple of days) continues to drive eastward toward the New England states. As a result, we will see another day where the winds are very light. The light winds coupled with the increasing warmth (at least aloft) will allow and inversion to form over the region. The inversion will enhance PM 2.5's ability to increase during the morning hours. As temperatures reach into the low 40s, expect PM 2.5 levels to rise well within the moderate range.

Extended Forecast

Date

12/21/2014

12/22/2014

Ozone

WHITE

WHITE

PM

YELLOW

YELLOW


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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