Here is CTP’s take tonight in their discussion.
Considerable spread remains for late week solutions. Medium
range models depict a surface low lifting up to the mid Atlantic
coast late Thursday into Friday in response to a deepening
upstream trough over the midwest. Phasing and timing differences
abound, however, still making this a low confidence scenario at
this time. A fair amount of medium range guidance (especially
ECMWF based) would support a light to moderate snowfall over
portions of central PA. Lack of blocking high makes a heavy
snowfall on the unlikely side, but we`ll continue to monitor
through midweek.