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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
August 30, 2014

 

Date: Saturday, August 30, 2014
Action Day?:  No
Temperature:  Upper 80s
Discussion:
On Saturday, expect mostly sunny early in the day to give way to a mix of sun and clouds late as the area of high pressure, which was off to our north on Friday, begins to shift eastward into the Atlantic. At the same time, a frontal system will continue to progress into the Great Lakes / Ohio Valley region. The combination of the high departing and the front incoming will steer our winds out of the southwest. As a result, temperatures will increase into the upper 80s. Humidity levels will also increase. This new air mass moving in will cause ozone and PM 2.5 levels to rise. Ozone will peak at the mid to upper moderate range thanks to the increase in clouds during the afternoon. The increase in humidity will also bump PM 2.5 levels in the moderate range.

Extended Forecast

Date

8/30/2014

8/31/2014

9/1/2014

9/2/2014

Ozone

YELLOW

GREEN

GREEN

GREEN

PM

YELLOW

YELLOW

YELLOW

YELLOW


Extended:
As we take a peek into next week, we notice that the week will start off on the seasonably warm side. The week will also stay rather wet as up to three storm systems move through our area. The first of these frontal systems will move through on Sunday. A second frontal system will move through on Tuesday, resulting in another round of rain for the region. As conditions begin to dry and warm during the middle of the week, another frontal system will begin to dig into the Great Lakes region. This frontal system will drop south across PA as we head into Friday / Saturday. Expect more rain over western PA before the front pushes off to our south. Cooler and drier air will filter in for the weekend as a new high pressure system builds in over eastern Canada. Overall, air quality levels are expected to be primarily dominated by PM 2.5, due to ozone reliance on sunshine (which this week has a lack of). PM 2.5 levels are expected to remain either in the moderate range or near the good / moderate threshold for much of the week. --Nolan

 

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