Notice the NAO is going negative next week; in fact, we have been in a negative NAO most of the summer. Some studies have shown that a negative NAO during the summer means heat in the Northeast, while a negative NAO in the winter means colder, stormy weather. So one can surmise that as the jet starts to migrate south in September that a negative NAO would mean stormy weather for the Northeast which looks to be the case next week.
The system coming out of Texas and the Gulf Coast will bring a lot of rain north late in the weekend and early next week. You can see on the GFS model total rainfall that some areas can pick up 1-3 inches of rain which may cause some minor flooding problems.
Also, the pattern across the Great Lakes and Northeast will feature several pushes of chilly air the next 14 days. I would not be surprise to see snowflakes over the Upper Peninsula of Michigan in the cold pushes.
Severe storms will develop across New England this afternoon and may produce damaging winds and even another tornado.
A busy weekend for the Midwest and Ohio Valley as severe storms will hit ahead of the cold front.
Severe weather will rip across the Northern Plains today. Parts of Canada may see tornadoes.
Severe weather will be the focus the next couple of days. Tornadoes may hit western Canada.
Heavy thunderstorms to bring some locally damaging wind gusts. Tornadoes for Canada! It's the season for them!
A cluster of thunderstorms or perhaps an Derecho will produce a swath of damaging wind gusts across North Dakota into northern Minnesota.