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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 18, 2015

 

Date: Saturday, April 18, 2015
Action Day?:  No
Temperature: Upper 70s
Discussion:
*** Saturday’s Forecast: A cold front pushing southward on Saturday will bring breezy and dry conditions to set up what will be quite a pleasant weekend. Scattered moderate levels of PM-2.5 should carry over from Friday evening into Saturday morning under an area of high pressure before the arrival of the front. Falling dew point temperatures will be a good indicator of just how dry the air mass moving in by the afternoon will be. Moderate levels of PM-2.5 will mix out with the increasing winds to see concentrations falling back to the good range. Despite the breeze, temperatures should climb well above normal and into the 70s under mostly sunny skies.

Extended Forecast

Date

4/18/2015

4/19/2015

4/20/2015

Ozone

WHITE

WHITE

WHITE

PM

YELLOW

GREEN

GREEN


Extended:
*** Sunday’s Forecast: Conditions will remain dry through at least the early afternoon on Sunday before the clouds return and chances for precipitation increase. The early half of the day should be nearly as pleasant as Saturday, but with temperatures not quite as warm and at more seasonable levels in the 60s. PM-2.5 concentrations should remain inside the good range with the dry and well mixed air remaining overhead for most of the day. *** Monday’s Forecast: Unsettled weather returns on Monday in what looks to be quite a wet start to the new work week. Even with moisture levels on the rise once again, rainfall rates look to be heavy enough to hold PM-2.5 concentrations to at least the higher end of the good range. Even when heavier rainfall is not occurring, winds look to remain breezy enough to help with mixing. With the rain and overcast skies, temperatures will really struggle to climb early in the day, but should reach the upper 60s to low 70s when slightly warmer air manages to push northward later in the day. *** Extended Outlook: Unsettled and breezy conditions look to continue through much of the remainder of the week. The heaviest of the rainfall for the remainder of the week will move through in the early hours of Tuesday with lighter and more scattered showers possible over the remainder of the week. Winds will remain breezy enough for PM-2.5 concentrations to not climb much higher than the low moderate range at times. Highest concentrations will most likely occur during the morning and late evening hours with improvements during the best mixing in the afternoon hours. Temperatures will be at near to below normal values throughout the remainder of the week. --- Roble

 

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