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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
July 1, 2015

 

Date: Wednesday, July 1, 2015
Action Day?:  No
Temperature: Upper 70s
Discussion:
Chances for showers and thunderstorms will continue into the morning hours on Wednesday before drier conditions move in for the afternoon. A few isolated to scattered showers/thunderstorms may develop Wednesday afternoon, but chances will not be as great as those on Tuesday afternoon. The flow will turn to more westerly, compared to the southerly breeze Tuesday. Smoke from the fires in Canada will once again transport eastward into the region with this westerly flow. With cloud cover early before increasing sunshine in the afternoon, ozone will be of concern due to the influence of the wildfire smoke, but not to the extent of earlier in June when we were under a ridge of high pressure. Most locations are expected to see peak concentrations in the higher end of the good range with an isolated chance of a moderate reading.

Extended:
Unsettled weather will return on Thursday with the next disturbance in this active pattern bringing chances for precipitation. Mostly cloudy to overcast skies will limit ozone to the good range again. Chances for showers will continue with the passing of each disturbance almost every other day into early next week. The winds on Friday will turn to more northerly and then easterly, pulling a cleaner air mass into the region. The onshore flow mixed with clouds and sunshine should continue to limit ozone to the good range. --- Roble

 

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