So today we have a storm that has convection to drive the snowfall rates. This is the first storm we have seen with thunderstorms since late December. Where the thunderstorms go into the cold air is where the heavy snow will go, so watch where they go. One of the issues with the storm will be any warm layers that may try to sneak in and change the snow over to sleet, so while you get a quick burst of heavy snow, it may end up with several hours of sleet which will hold down snow amounts south of I-80. There can even be some thunderstorm and lightning mixed in with the snow and sleet coming up the Ohio River into Pennsylvania.
The storm Sunday into Monday reminds me a lot of the Feb. 18, 1979, storm that hit the mid-Atlantic. The trough dug into the mid-Atlantic and exploded a storm along the coast. We had a positive NAO and negative PNA at the time. I recall the storm because we were in school watching the snow pile up over a foot then had to get home in the heavy snow. The GFS is showing such a storm, but I am not convinced yet that is how it will turn out. I guess we will see.
A new tropical system may be a threat to southern Florida late in the weekend and early next week.
The tropics will produce a storm that could impact the United States coast.
A cold front will be led by severe storms all the way to the Northeast this weekend. Tropics could produce a big storm.
A cold front coming east will produce several days of several weather. Tropics could get active next week as a big high comes down.
A cold front that will bring a change to nicer weather will also produce severe storms in the Plains first Thursday and Friday then eventually in the East this weekend.
The system that produced the flooding rains in Louisiana will bring severe storms to the Northeast today.