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Susquehanna Valley Ozone/PM2.5 Forecast

Small map of Pennsylvania showing counties involved in the sv partnership.
Forecasted AQI for Ozone Air Quality Index Scale Forecasted AQI for PM2.5
July 23, 2014

 

Date: Wednesday, July 23, 2014
Action Day?:  No
Temperature:  lower 90s Wednesday
Discussion:
A strong cold front will cross the area late in the day Wednesday or early Wednesday evening. Out ahead of it heat and humidity will continue to build. Afternoon temperatures will reach into the lower 90s with a fair amount of sunshine. Thunderstorms will then build into the area later Wednesday afternoon and Wednesday evening. Hard downpours and gusty winds are possible. Enough sunshine will boost ozone levels into the lower moderate range, and fine particulate will also remain in the moderate zone. Turning cooler Wednesday overnight with a couple of showers lingering.

Extended:
A progressive weather pattern will continue into the early part of next week, so prolonged periods of poor air quality are unlikely. Cooler and much less humid Thursday in the wake of a cold front. A morning shower will give way to sunshine by the afternoon with temperatures struggling to get to the 80 degree mark. A north to northwesterly flow will promote low concentrations of both ozone and fine particulate. High pressure will then build overhead by Friday, bringing a sunny and pleasant day to the region. Afternoon temperatures will recover into the lower 80s, and with a dry northwest flow continuing, low levels of ozone and fine particulate will result. Humidity will then build back into the area over the weekend, with increasing chances for afternoon thunderstorm activity, especially during the day Sunday into Monday with the next cold front approaching. Air quality may thus deteriorate to the moderate range once more. A return to good air quality is then possible by Tuesday of next week as a new air mass of Canadian origin moves southeastward.--McAuliffe

 

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