February 12 – It may be cold enough for you already, but it is going to get colder. We start with single digits and teens, but the core of the arctic air will arrive this evening and last all weekend. The York PA airport is the anomaly with a reading of -5°F. That is accurate, but very localized. This may be one of the coldest Valentiness Days on record. Beyond that Monday will bring accumulating snow. The big question will be the developing storm, which I discussed last night. The trend has been to transition to ice, and rain. But that storm track is still up for debate. The focus now is on the front end and the arrival of the new air mass with a clipper. So if you have plans tonight, consider snow. More snow showers will continue Saturday as the high temperature will be at midnight, then growing colder all day. The Polar Vortex may clip northern New England, but you will think it has come here.
The arrival of the cold air, we will come with snow this evening. Here is a look at the spread of snow as shown by the HRRR Model. A steady band could drop an inch or two west. It will arrive in Baltimore around 8PM then reach Annapolis and the Eastern Shore tonight (beyond this slider –> timeframe)