AIR QUALITY ACTION DAY HAS BEEN DECLARED FOR SUSQUEHANNA VALLEY ON FRIDAY, JAN 23

 The Department of Environmental Protection has declared an air quality action day for Jan.23.
Tomorrow’s Forecast
Friday, Jan 23: 110 AQI Unhealthy for Sensitive Groups Particle Pollution (2.5 microns)

Extended Forecast
Saturday, Jan 24: 81 AQI Moderate Particle Pollution (2.5 microns)
Current conditions: Clouds and fog are breaking up across the region as of 1 p.m. EST this Thursday afternoon. High pressure will slowly build into the area overnight tonight into Friday. We are concerned about very light winds near the surface as the high builds in with very little mixing expected. In addition, temperature inversions are likely to trap PM2.5 close to the ground. So for tonight, expect some clearing skies with very light winds. Fine particulate will increase into the code ORANGE range later on tonight as the temperature inversion develops. Low temperatures close to 20 degrees. Friday’s forecast: A PM2.5 Action Day will be declared for the day Friday as very light winds and some warming aloft will bring any mixing in the boundary layer to a halt. Code ORANGE concentrations of fine particulate are likely with this scenario. With some sunshine, afternoon temperatures will recover into the middle 30s. A storm system coming out of the deep South will then move northeastward towards us Friday night into Saturday, and with the current forecast track, we could be in line for a quick inch or so of snow during this period. Precipitation could briefly turn to a bit of rain by later Saturday morning as temperatures creep just above the freezing mark. While atmospheric mixing will be a little greater on Saturday, fine particulate concentrations will remain well into the moderate range. *** Extended forecast: The weather pattern will continue to be an active one as we move into the early part of next week. A clipper system will move eastward and affect the area later Sunday night into Monday with snow. Because the low is expected to track more to the south, precipitation could fall as all snow as cold air remains in place. Following this, a large area of high pressure builds in for Tuesday into Wednesday of next week with dry weather and light winds. Low moderate levels of PM will occur Sunday into Monday, but with high pressure building in next week with existing snow cover, we have to again be concerned with stronger inversions trapping fine particulates close to the ground.–McAuliffe
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