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Susquehanna Valley Ozone/PM2.5 Forecast

Small map of Pennsylvania showing counties involved in the sv partnership.
Forecasted AQI for Ozone Air Quality Index Scale Forecasted AQI for PM2.5
September 20, 2014

 

Date: Saturday, September 20, 2014
Action Day?:  No
Temperature:  Mid to Upper 70s
Discussion:
*** Saturday’s Forecast: A light southerly breeze will help to usher in a slightly warmer and more humid air mass on Saturday. PM 2.5 concentrations are expected to climb into the moderate range early with the arrival of warmer air aloft prior to the warmer temperatures arriving at the surface. Some cloud cover and patchy fog early should transition to more of a mix of sun and clouds by the afternoon. Highs should reach the mid to upper 70s.

Extended Forecast

Date

9/20/2014

9/21/2014

9/22/2014

Ozone

WHITE

WHITE

WHITE

PM

YELLOW

YELLOW

GREEN


Extended:
*** Sunday’s Forecast: Warmer and more humid conditions will continue on Sunday before a cold front swings through by late in the day. PM 2.5 concentrations will again remain inside the moderate range, though will begin falling with the arrival of the front. The best chance for precipitation over this forecast period will occur Sunday afternoon to evening as the front approaches. A south southwesterly breeze early in the day will become more west/northwesterly after the front pushes eastward. Highs will be in the upper 70s to low 80s, a bit above normal for the final full day of summer. *** Monday’s Forecast: A cooler and cleaner air mass will move in behind the cold front for Monday. Breezy northwesterly winds will keep the air well mixed, leading to good levels of air quality for the final few hours of summer. Forecast highs for the day will be limited to the upper 60s. High pressure will begin to build from the west and will eventually control our weather for later on in the week. Fall will officially arrive Monday night. *** Extended Outlook: High pressure will be positioned more overhead starting on Tuesday and is expected to remain there for most of the week. Mostly sunny skies with seasonal temperatures will be an almost daily occurrence as a result. PM 2.5 levels will still be inside the good range early on Tuesday, but as the high moves more overhead and winds become calmer a period of more stagnant air will allow for moderate concentrations to return. The week looks to remain fairly dry as well. --- Roble

 

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