The same system that brought more than a dozen tornado reports from Iowa to Illinois and Michigan is now headed for the East Coast.
Severe storms have already begun to form, and more will continue to develop into the afternoon and evening.
The area at the greatest risk stretches from northern Virginia to western Massachusetts and includes big cities like New York, Philadelphia, Baltimore and Washington D.C.
Strong, damaging winds and a few tornadoes are the greatest threats, similar to what the Midwest experienced yesterday.
The National Weather Service will issue severe thunderstorm warnings for storms capable of producing winds in excess of 58 miles per hour, large hail an inch or greater in diameter or a tornado.
Lightning, however, won't spawn a warning even though it can be just as deadly, and all thunderstorms produce lightning. That's why the NWS is making efforts this week to educate the public during Lightning Safety Awareness Week.