The storm system responsible for the tornado carnage in the Heartland this week has reached the Appalachians and the eastern Great Lakes.
Concerns Thursday/Thursday Night
While not forecast by AccuWeather.com meteorologists to be nearly as ferocious as the storms spanning last Sunday through Wednesday, severe weather will stretch from southern Ontario to tornado-weary Alabama and northern Georgia into tonight.
The ongoing severe weather outbreak into this evening will likely produce only a few tornadoes. However, there is still the risk of such a storm hitting a populated area.
The overall severe weather and tornado threat area continues to press farther to the east into more densely populated regions.
With only a few tornadoes forecast for today and tonight, the most common outcome from the storms will be damaging straight-line wind gusts and flash flooding.
However, both of these more common effects from severe thunderstorms can also claim lives and result in property loss due to anything from falling trees to rapidly rising waters.
Friday, the risk of flash flooding from a potential trainload of drenching thunderstorms will extend from southern Quebec to West Virginia.
The intensity of thunderstorms reaching I-95 Friday is not set in stone.
At the very least, there will be locally drenching showers and thunderstorms that can lead to some travel delays and perhaps urban flooding issues.
The greatest risk of more serious storms and flooding seems likely north and west of a slot from Washington, D.C. to Philadelphia, New York City and Providence, R.I.
One thing to keep in mind is the risk of severe weather increases markedly in the Northeast during late May and June. This is because the cooling and stabilizing impacts of the Great Lakes and the Atlantic Ocean are gradually lost, while storm systems approaching from the Midwest remain relatively strong.
The peak of the Eta Aquarid meteor shower is set for this week and good viewing conditions are in store for parts of the Southeast and Southwestern U.S.
A surge of warmth into the Northeast will create Boston's warmest day so far this year on Monday.
Summer warmth will dominate most of this week in Pittsburgh, creating the warmest days so far this year.
It will not feel like a typical early May week around Washington, D.C., and Baltimore this week with warmth dominating.
Early indications suggest that the first tropical system of 2015 could spin up off the southern Atlantic Coast of the United States later this week.
After a cooler-than-normal summer 2014, the Northeast can anticipate more 90-degree days. Meanwhile, drought conditions will expand in the West.
Charleston, SC (1761)
Large tornado swept Charleston harbor when British fleet of 40 sails was at anchor. Raised waves 12' high, many vessels on beam-ends, 4 killed.
May snowstorm from New York City southwest to to Pennsylvania and south into Virginia; ground covered, severe frost in North Carolina, fruit killed.
Eastern U.S. (1812)
May snowstorm swept from Philadelphia northeastward to Maine. Snow covered ground in New York City; 12" accumulated near Keene, New Hampshire, 9" fell at Waltham, Mass., near Boston.