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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 21, 2014

 

Date: Tuesday, October 21, 2014
Action Day?:  No
Temperature:  Low 50s
Discussion:
On Tuesday, expect cloudy skies to persist across the region as a frontal system (the same one that was over the Ohio Valley on Monday) crosses the region. Before the front moves through, expect some isolated showers to fall across portions of western PA. Once the front moves through, the counter clockwise rotation around the high will enable our winds to turn out of the northwest, which, in turn, will force cooler and drier air into the region. As a result, expect temperatures to only peak in the low 50s. The combination of the cool and dry air working in along with the increase in winds during the afternoon will help to confine PM 2.5 levels to the good range.

Extended:
Over the coming days, expect to see the area of low pressure, which pressed through our area on Tuesday, restrengthen off the New Jersey coastline. As it does, it will keep much of the Northeastern US coastline soggy. At the same time, our winds will continue to remain out of the north, resulting in cool and dry conditions over much of western PA. Therefore, expect air quality levels to range within the good category through the end of the work week. Over the weekend, as the storm system off the New Jersey coastline lifts off to the north and east, a new area of high pressure will begin to extend northeastward from the southeastern US. At the same time, a new frontal system will be pushing into the Great Lakes. This front is expected to push south across our area late in the weekend, putting a halt to the brief warm-up that began on Saturday. The cool down will also be brief as a new high pressure system, which was over the northern Plains on Saturday, drops in over the southeastern US by Monday. Therefore, the variability in daytime temperatures over the weekend into early next week are likely to keep PM 2.5 levels at bay and keep levels near the good / moderate threshold. --Nolan

 

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