Monday, 11:30 a.m.
After what seems like an eternity, spring has broken out across much of the country. Here's the maximum temperature chart from Sunday:
It's not like this is a 'one and done' type of deal. Actually, this afternoon will be warmer in many places across the mid-Atlantic and potentially even higher tomorrow and Wednesday! Look at the 6z GFS ensemble projected temperature anomalies for Wednesday:
That's a large area from the Mississippi Valley to the mid-Atlantic and southern New England with double-digit departures, some 20+ above normal!
With a storm dropping through the West into the central and southern Rockies tonight and tomorrow, then toward the Plains on Wednesday, there's a lot of cold air that will be pulled southward from central and western Canada into the deep upper-level trough, and that will lead to equally large departures BELOW normal over the eastern Rockies and Plains tomorrow and Wednesday.
That much cold air will translate into snow once again. A north to northeast wind will drive the cold air into place as the storm redevelops out on the Plains:
How much snow? Here's our latest forecast here at AccuWeather.com:
And that's just into Wednesday. The snow may well linger Wednesday night into Thursday across parts of the Midwest and the Upper Peninsula of Michigan as the storm finally begins to open up and accelerate off to the northeast. There could even be some snow showers Friday into Friday night across parts of upstate New York and northern New England, not uncommon for the second week of April.
So, while spring fever is spreading rapidly from the Plains to the East Coast today, there's still plenty of wintry weather to go around this week.
Summer has ended astronomically, but from a meteorological standpoint, there's plenty more warm weather heading into October from the Plains to the East.
Two strong cold fronts will charge across the country in the next week, eventually taking out the current hot and humid air mass from the Plains to the East Coast.
Over the next three days, hot and humid air will expand across the Mississippi Valley all the way to the East Coast. This will be followed by even more heat and humidity leading into the weekend.
Hermine will head across the Florida Panhandle late tonight, then cut across the coastal Carolinas and become a headache for the mid-Atlantic and southern New England over the Labor Day weekend. It will be followed by a heat wave later next week.
The heat and humidity will be erased from much of the East later this week, but warmth will spread from the Plains eastward over the weekend. The tropics could still play an important role in the weather along the Eastern Seaboard this weekend.
A dominant ridge will keep it hot from the Ohio Valley to the East into next week, while the disturbance north of Cuba is slow to develop as it approaches the southeastern Gulf of Mexico.