PA Ozone/PM2.5 Forecast
December 5, 2013
Date: Thursday, December 5, 2013
Temperature: Near 60 degrees
The unseasonably warm air mass will keep temperatures overnight well above normal for early December. Breezy southerly flow will continue to usher increasing moisture into the region. Dew point temperatures will climb throughout the day as a result along with increasing chances for showers. Forecast highs may approach the 60 degree mark once again. Moderate levels of PM 2.5 through the early morning will gradually fall back into the good range as the southerly breeze increases vertical mixing and the falling precipitation helps to further clean out the air mass. Greatest chances for precipitation will come later in the day with heavier showers expected on Friday.
Rain showers will continue early on Friday before colder air begins to filter in and drop temperatures back to more seasonable levels. The breezy southerly flow will turn more northwesterly as a cold front tries to push to our east. There is potential that the rain showers change over to more of a wintry mix to snow before the disturbance slides to the north and east. Good air quality will continue with moisture levels rapidly decreasing. Breezy northwesterly flow will continue on Saturday, keeping PM 2.5 levels inside the good range as well as reinforcing the cold air to keep temperatures close to or just below freezing. Late morning through the overnight hours Saturday will likely be the driest of this forecast period. The next disturbance will approach the region on Sunday, presenting another potential for snow/wintry mix before changing over to rain by Monday morning. The details of this event will evolve better over the next few days, but good levels of PM 2.5 are expected to continue. --- Roble
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