News & Events

October 28 Air Quality (PM2.5) Foreceast

Monday, October 27, 2008

Tuesday, October 28, 2008:
Fine Particulates (PM 2.5) – Code GREEN

Short-Term Discussion: A cold frontal passage this morning is bringing in chilly air this afternoon. With an adequate amount of mixing, fine particle levels are in the code GREEN range. Temperatures with a couple of showers and a cloud-filled sky are remaining around the 50-degree mark.

Tonight, an area of low pressure will develop just off the Delmarva peninsula, and this will intensify as it moves northward into New England. For us, this will mean brisk and chilly conditions with perhaps a little rain overnight and lows dipping into the upper 30s.

Tomorrow, a cold wind will blow, with plenty of cloudiness as well as additional rain as the storm moves into New England. With borderline temperatures, snow cannot be ruled out in the highest elevations of the Poconos tomorrow and tomorrow evening as temperatures remain in the 30s above 1,800 feet. With the ground still warm, it may take a while to stick, but a few inches of snow are possible if it falls heavy enough. Below 1,800 feet, no snow accumulation is expected. Wind gusts past 40 mph out of the west and northwest are a possibility as well. Temperatures will not get out of the lower and middle 40s in the valley, and with the wind, it may feel as though it is close to freezing. With excellent mixing, air quality will remain good.

Tomorrow night will be brisk and cold with a few lingering rain and snow showers. Little or no snow accumulation is expected. Temperatures will fall into the lower and middle 30s with wind chills well down into the 20s.

Extended: A chilly breeze once again for Wednesday as we will be in between low pressure in the Canadian Maritimes and high pressure building in from the Ohio valley. Once again, afternoon temperatures will struggle in the middle 40s as sunshine will be in short supply. A little more sunshine and milder Thursday with afternoon temperatures perhaps reaching 50-55 degrees. A southwesterly flow may set up by Halloween, causing temperatures to rebound into the lower 60s. Overall air quality should remain good through Thursday, with perhaps some moderate readings by the end of the week with the southwest flow setting up.

Regional Maximum PM 2.5 Concentrations:
Friday, October 24, 2008:
PM 2.5 –GREEN (50 AQI or 15.3 µg/m3)

Saturday, October 25, 2008:
PM 2.5 –GREEN (25 AQI or 7.8 µg/m3)

Sunday, October 26, 2008:
PM 2.5 –GREEN (49 AQI or 15.2 µg/m3)