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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
November 27, 2014

 

Date: Thursday, November 27, 2014
Action Day?:  No
Temperature:  Mid to Upper 30s
Discussion:
On Thanksgiving, mostly cloudy skies will persist through the day as the storm system, which plagued much of the Northeastern US with rain/snow on wednesday, moves out to sea. On the backside of the system, an area of high pressure will build in over the northern Plains. At the same time, a weak clipper system will slide south of the Pennsylvania border and provide snow for the higher terrain in West Virginia / Maryland and Virginia. We could even see some light accumulation around our area. Due to the location of the high, winds will remain out of the northwest, keeping temperatures cool and dewpoints low. High temperatures are likely to range in the upper 30s. The additional snow cover along with the light surface winds will allow an inversion to form. The inversion coupled with continual light flow in the afternoon is likely to drive PM 2.5 levels into the low moderate range.

Extended:
Over the next week, expect temperatures to more reminiscent of a see-saw. Early in the work week, temperatures will drop thanks to a cold front moving through our area. An area of high pressure will be quick to build in over the Great Lakes and drive cooler (near seasonable) temperatures across PA. As quick as the high built in, it will be even quicker to move out as the next storm system moves in for mid-week. Once the front associated with that system moves through, a new high pressure system will build in and force cool, dry conditions into the region. This high will move east fairly quickly and allow for warmer air to build in from week's end. All in all, temperatures should hover about 5 to 10 degrees on either side of normal for the duration of the week. The progressiveness of the pattern will keep air quality levels within the good range for the period. --Nolan

 

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