Schools in Philly are had a number and would call into a KYW 1060 AM in the morning with their posture (2hr delay, modified Kindergarten, etc.). As a kid, you'd be up at 6am waiting on your number to be called. It was like winning the lottery:
Blocking is great, but you need an antecedent high pressure over Quebec to force northeast flow and the low and mid levels to lock in the cold. We don't have that so it let's the coastal rush south/southeast winds in and flip us to liquid.
Watch this be an event where we clear out after dusk Wednesday for a few hours and then wet bulb like 2 or 3 degrees colder and jackpot. We're good for one of those a year.
RE: Thurs-Fri event
The 12z GEFS is advisory level snow/ice N&W of I-95. It's "contaminated" by a few inland running coastal lows that go into Lancaster/Lehigh Valley. If we get rid of those, it's probably a solid event.