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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
February 27, 2015

 

Date: Friday, February 27, 2015
Action Day?:  No
Temperature:  middle teens Friday
Discussion:
High pressure building in from the Ohio valley on Friday will bring more in the way of sunshine, but it will remain very cold with highs only in the middle teens. Fine particulate will start off in the moderate range, but lower concentrations are likely by the afternoon. Fine particulate will average well into the moderate range Friday night with a strong inversion as well as calm winds. Lows zero to 5 above.

Extended:
Things will not be as cold in the long range period, but the pattern will get more active in terms of precipitation events. Sunshine and only a few clouds on Saturday with the mercury recovering into the lower 20s by the afternoon. PM2.5 will be solidly in the moderate range with very light winds and limited mixing, and code ORANGE values cannot be ruled out in the morning. Increasing cloudiness on Sunday with snow possible late in the day and at night, but accumulation details remain uncertain. High temperatures Sunday rising into the middle 30s, with upper 20s likely at night. A small area of high pressure then builds in for the day Monday with sunshine returning and highs mainly in the lower to middle 30s. Another system will then bring snow to start, then plain rain Monday night into Tuesday. Air quality early next week will vary between the upper good and the middle moderate range, depending upon intensity of precipitation with storm systems and the strength of northwesterly winds behind them.--McAuliffe

 

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