Here are CTP’s thoughts for tomorrow.
By the mid to late afternoon (New Years Eve), a wave of low
pressure will drift eastward across the Great Lakes, and drag an
Arctic front south through the Commonwealth. Underneath a
favorable left exit region of an upper jet, this front could
produce a threat of snow squalls late Wednesday evening into the
New Year. Current expectation is that the front and associated
snow squall threat will move into northwest PA in the 6-8PM
timeframe and then race southeast, crossing the I-99 corridor
between 10PM and midnight and then getting into the Lower
Susquehanna Valley between midnight and 2AM. Anyone planning
to travel for the New Year should be prepared for the risk of
snow squalls. If a Snow Squall Warning is issued, delay travel
or exit the highway at the next opportunity.