Synopsis:
Rain will work its way into Pennsylvania tonight and will remain in place throughout Tuesday. Wednesday will serve as a day of transition to a colder, more seasonable pattern before we see a system move up from the south and bring in some snow showers early Thursday morning.
Short Term:
As of forecast time, there was a stationary front situated to the west of Pennsylvania. Associated with it is a large swath of rain stretching from Louisiana into southern Quebec. The rain is just beginning to enter Pennsylvania from the NW corner, according to radar imagery. While most of the rainfall at the moment is simply streaming SW to NE along the front, the front will get a push from some upper-level forcing, bringing rain to all of PA by tomorrow morning. Tuesday should be rainy day for nearly all Pennsylvanians. It will also be another very mild day, with temperatures in the high 40s to low 50s. By Tuesday evening, the heaviest rainfall will be ending for most regions.
Long Term:
Wednesday will serve as a day of transition to a colder period with more unsettled weather on the way to end off the week. A westerly wind will limit temperatures during the day, keeping many areas below 40 degrees. While there is still uncertainty in the models as to where exactly a surface low will track later into Wednesday and Wednesday night, it appears nearly certain that southern portions of Pennsylvania especially will see some precipitation from this event, much of it in the form of snow, as temperatures should dive below freezing at the surface. The bulk of this precipitation will make its way through, mostly below the I-80 corridor; it appears, overnight, pushing off to the east by Thursday morning. There will be a slight clearing in the wake of the Thursday system; however, it does look like skies will remain mainly cloudy. We're also monitoring a small slug of moisture which looks poised to work its way towards the state late Friday into Saturday, with some portions of western PA likely to see some light lake-effect snow bands. Temperatures will settle back towards normal values by Thursday and should remain there for several days beyond the end of the forecast period.
~Devin Boyer
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