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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
April 19, 2014

 

Date: Saturday, April 19, 2014
Action Day?:  No
Temperature: Low to Mid 60s
Discussion:
*** Saturday’s Forecast: A weak cold front pushing east Friday evening will bring in drier air aloft early on Saturday; yielding mostly sunny skies for what should be a pleasant and dry weekend. Winds will become breezy out of the north by the afternoon hours. PM 2.5 concentrations will remain in higher end of the good range for the early half of the day before falling further into the good range as these winds increase mixing. Most locations will see concentrations average out in the higher end of the good range for the day. Highs for the day will be in the low to mid 60s.

Extended Forecast

Date

4/19/2014

4/20/2014

4/21/2014

Ozone

WHITE

WHITE

WHITE

PM

GREEN

GREEN

YELLOW


Extended:
*** Sunday’s Forecast: Mostly sunny and dry conditions will continue into Sunday. PM 2.5 levels will begin the day inside the good range. The breezy winds from Saturday will become lighter and more easterly to southeasterly as high pressure shifts eastward. Similar to that of Friday, a slight increase in moisture aloft may yield a period with some light cloud cover through the afternoon. With the lighter winds and increasing moisture later in the day, PM 2.5 concentrations should return to the low moderate range by the late afternoon/evening. Highs for the day should manage to push into the low 70s. *** Monday’s Forecast: The southeasterly flow from Sunday will become more southerly on Monday, resulting in warmer and more humid air pushing north into the region. The flow will be a light breeze, so dew point temperatures will rise throughout the day. This should be the day with the most favorable conditions for moderate air quality over this forecast period. Light winds and increasing moisture will allow for PM 2.5 concentrations to climb well inside the moderate range. The area of high pressure that kept skies mostly clear over the weekend will weaken a little, resulting in potentially a mix of sun and clouds. Ozone concentrations may rise with forecast highs in the low to mid 70s, but will be dependent on the amount of cloud cover as to how much of a rise we will see. *** Extended Forecast: Moderate air quality will continue into Tuesday, but an approaching disturbance will bring increasing chances for precipitation. This precipitation does appear to be light at the present time. Therefore, it is expected that PM 2.5 levels will remain in the moderate range through at least the first half of the day before a cold front pushes through the region. Behind the approaching cold front, increasing winds should provide enough mixing to improve air quality conditions Wednesday and potentially Thursday. High pressure will return to the region late week. --- Roble

 

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