Synopsis:
The remainder of the week looks to be standard fall weather across Pennsylvania. Mostly cloudy skies and cool temperatures are what you can expect for Wednesday and Thursday. Highs in the 40's and lows in the upper 20's should be the norm across the state. Things change on Friday when we warm up a bit ahead of an approaching front. Temperatures should get back into the 50's for at least some the area on Friday. A blast of arctic air will slam into the region on Saturday bringing the coldest temperatures of the fall so far and a few snow showers are likely as the front pushes through.
Outlook:
An area of steady, high pressure and associated subsidence will dominate PA weather today and tomorrow. Northerly winds and mostly clear skies will lead to below-normal temps and large diurnal temp swings. Our next system develops in the wake of the high and closes off ~18Z Friday afternoon over the Great Lakes. Yesterday, the ECMWF had this storm moving up the east coast with Nor'easter potential, but the current solution brings it up into Canada to our NW. Consequently, instead of feeling the direct effects of the low, we will experience an Arctic cold front Saturday morning. The precipitation might clear out by gametime, but so will the warm air. With the 510 line in southern PA, we will likely experience the coldest air of the season so far, with highs Sunday and Monday struggling to rise above freezing.
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