Much warmer from DC to NYC later this week; less change farther north

1. It looked like anything but springtime in the middle of Pennsylvania Monday evening:

I don't know whether these are daffodils or crocuses, but I do know what snow looks like!
2. But this coming Friday, here's the GFS temperature forecast for 2 p.m. ET.

Note that even though 70s are being predicted at the Pennsylvania-New York border, it will only be in the 20s just north of the Canadian border.
3. Here is the pressure pattern map from earlier this morning, with cold air still dominant:

4. This video suggests how things will change as we go through the week: