Wednesday 9 a.m.
In this video, we look at how the upper-air pattern will change to bring a temporary warmup... then more chill.
Persistent flow from eastern Canada will continue through Friday, leading to rather consistent temperatures from one day to the next. Milder air will reach the Northeast for the weekend; cold will return next week.
Note: I will be out of the office from tomorrow until April 10. I will post occasionally.
The front will move into a region with high humidity as it approaches the I95 corridor tomorrow. This is the basis for SPC's forecast of thunderstorms approaching severe limits tomorrow.
Tropical Storm Colin is caught in the southern stream while the northern stream is helping to send unseasonably cool air out of central Canada.
Then, as the cold front arrives, there may be violent thunderstorms. This map shows the early morning SPC assessment of the severe weather risk on Sunday:
Farther east on Sunday, rain is likely to be more extensive, and there is a severe thunderstorm threat from the Middle Atlantic region on south.
With the second front, shower activity may be spotty at first as the system comes through Chicago on Saturday but could be wetter and more stormy than the first front by time it reaches the I-95 corridor Sunday.
A pocket of dry air covers most of the area from the Great Lakes to the back edge of the East Coast clouds. This suggests sunshine will be the rule across the Northeast until the next frontal system approaches later in the week.