Friday 10 a.m.
It is very warm from the Middle Atlantic states to the Ohio Valley today. While cooling will come to the Ohio Valley early next week, there will be a pronounced cooldown from Maine to Michigan to Maryland. There is a danger of a frost or freeze in much of that area Monday night and/or Tuesday night. Such an event is quite common at the end of March, but this year the effects on vegetation could be more severe because growth has progressed much further than usual. The video shows why the cooldown should occur.
Thunderstorms were common yesterday and last night as a large low pressure area lumbered eastward from the Plains. This map shows the lightning stroke pattern from 8 a.m. EDT yesterday to just before daybreak today.
In the Northeast, a high pressure area now in control will be reinforced by another high from northeastern Canada. In the "what could go wrong?" department, a batch of cloudiness has appeared east of New England and has been spreading southwestward toward the New Jersey coast this morning.
The clouds over parts of the region are starting to break up, a sign that the predicted drier air from the northeast is making progress.
Cloudiness covers a large area. A few pockets of clearing show up where south winds ride downhill from mountains to lowlands. Air warms and dries with descent. Notice clearing downwind (northwest of) the Smoky Mts.
So, there could be more showers at times late next week as forest we can tell. For now we are stumped. But, it is our beleaf that this weekend you will like being outside. I know a dogwood. It may be a little cool for the beech, but you can take your dog for walk in the bark. What about next weekend? Don't ax.
If the pattern turns out damp as suggested by this map for Sunday, it could turn gray and drizzly from D.C. to New York City for early next week. If the high does not move offshore and no disturbance approaches from the west, it would be sunny and warm.
Two things stand out: (1) a warmup this weekend and early next week (the top graph), and (2) the overall dryness for the weekend and early next week. This graph is for Philadelphia.