News & Events

PM2.5 Back Down To Green Levels as Winter Storm Approaches

Thursday, December 18, 2008

A major winter storm will take aim on the region Friday. The National Weather Service in Mount Holly, NJ has issued a Winter Storm Watch for very late tonight into Friday evening. There will be a very fine line between heavy snow to the north and sleet, ice and rain to the south. Accumulations of snow and ice will be greatest across the high elevations of Northampton county with over 6 inches possible. 2-4 inch amounts should be common down in central and southern Berks counties where more sleet, ice, and rain can mix in. Temperatures will average in the lower and middle 30s during the day Friday. Due to lighter precipitation in the early morning, PM 2.5 levels will be in the low moderate range, but these should drop into the good range with an intensification of precipitation by the afternoon.

Snow and sleet should taper down tomorrow night as this storm moves away. Plenty of cloudiness with lows in the middle and upper 20s.

Extended: The extended period leading up to Christmas promises to a busy, hectic, and stormy one in the forecasting department. A second storm will bear down on the region for late Saturday night and Sunday, and additional snow accumulations are possible as cold air might remain for several hours before a changeover to sleet and rain can occur. How much snow accumulation is dependent on how much cold air can be injected into the system from the north. Following this, it will be brisk and cold for early next week. A third storm may affect us with more winter-like precipitation for Christmas Eve. Due to the rapid progression of weather systems, fine particulate air quality should remain good over most of the long range. The only possible exception to this might be on Saturday with a light wind flow due to high pressure briefly moving in.

courtesy: Mike McAuliffe
Air Quality Specialist / Meteorologist
PA DEP Bureau of Air Quality