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Lehigh Valley Ozone/PM2.5 Forecast

Small map of Pennsylvania showing counties involved in the lv partnership.
Forecasted AQI for Ozone Air Quality Index Scale Forecasted AQI for PM2.5
September 2, 2015

 

Date: Wednesday, September 2, 2015
Action Day?:  No
Temperature: near 90 Wednesday
Discussion:
Another hazy and hot day is in store for Wednesday as winds will continue on the light side, allowing a continuation of mid to high moderate PM2.5 readings. Ozone concentrations will also rise through the day, and peak in the high moderate range in spite of the lowering sun angle. Warm and humid Wednesday with lows in the upper 60s.

Extended:
The heat will continue on Thursday, but with a cool front coming in from the north and west, a thunderstorm is likely in the afternoon and evening. This will limit ozone formation to the middle moderate range. Fine particulate will remain moderate with winds light and humidity high. High temperatures will climb close to 90 degrees. Relief will then come by Friday in the form of more clouds, an onshore breeze, and cooler temperatures. These factors will force ozone down into the good range with a couple of showers also possible. Good ozone will continue Saturday with more sunshine than clouds with highs close to 80. As high pressure dominates the area later on in the Labor Day weekend, winds will lighten, with fine particulate and even ozone creeping back into the moderate range. A stronger cold front will then bring cooler weather and good air quality around the middle of next week.---McAuliffe

 

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