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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
September 21, 2014

 

Date: Sunday, September 21, 2014
Action Day?:  No
Temperature:  Mid 70s
Discussion:
On Sunday, expect the skies to turn mostly cloudy as the high pressure system, which was in control of our weather on Saturday, moves into the Atlantic. At the same time, a new frontal system will push through the Great Lakes / Ohio Valley region toward our area. As a result, expect the chance of rain to increase during the day. Southwesterly winds will continue to persist in advance of the front. Therefore, high temperatures are still expected to make their way into the mid 70s. The air mass will be even be more humid than Saturday. Therefore, expect PM 2.5 concentrations to reach the moderate threshold once again.

Extended Forecast

Date

9/21/2014

9/22/2014

Ozone

WHITE

WHITE

PM

YELLOW

GREEN


Extended:
As we take a peek into this week, we notice that the work week will start off on the cool side after a frontal passage on Sunday delivers a Canadian air mass for our area. The main driver of the cooler weather, an area of high pressure residing over the Great Lakes, will shift east through the week. This high will finally shift east of our area in the Thursday / Friday time frame. Therefore, expect PM 2.5 levels to stay within the good range for the first half of the work week. It isn't until the warm and moist conditions return for the second half of the week that PM 2.5 levels are likely to rise back into the moderate range. --Nolan

 

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