A cold front slicing through stifling heat and humidity will give way to vicious thunderstorms this afternoon and evening.
Targeted cities include Boston, Providence, Hartford, New York, Philadelphia, Baltimore, Washington D.C., Pittsburgh and Cleveland.
On Tuesday, powerful thunderstorms erupted from this same front. Across northern New York, Vermont and New Hampshire, there were dozens of reports of downed trees and large hail.
This afternoon, the thunderstorms will explode farther south across the megalopolis.
Read about the impacts these storms have had so far along the Northeast and eastern coast.
The main threats from these beastly storms will be damaging blasts of wind, hail larger than the size of quarters, dangerous, vivid lightning and blinding downpours.
If you have outdoor plans this afternoon and evening, pay close attention to the weather. Keep an eye to the sky and heed any watches or warnings that may be issued.
If a watch is issued, this means the potential for a dangerous thunderstorm is high, but the threat is not imminent. If a warning is issued, this means a dangerous thunderstorm is imminent, and you should take shelter immediately.
For the latest storm information, please check back often at AccuWeather.com.
At least 20 people have died in West Virginia as a result of extreme flooding that inundated portions of the state on Thursday.
On the heels of Danielle, another weak tropical system will move onshore from the Gulf of Mexico with drenching downpours and the risk of flash flooding.
The risk of thunderstorms and severe weather will return to the north-central United States this weekend, including some areas that were hit by violent storms on Wednesday.
Portions of North and South Carolina will face the threat for heavy thunderstorms that could turn severe into Friday evening.
Showers threaten to cause delays on a nearly daily basis next week at the 2016 Wimbledon Championships.
After dealing with heavy thunderstorms and heat to start the weekend, Germany will welcome more seasonable temperatures and fewer downpours early next week.
Pennsylvania, Ohio (1972)
During "Agnes" floods, the Ohio River crested at 35.8".
New York, NY (1975)
A Boeing 727 crashed on a landing approach to JFK. Believed to be caused by a "microburst" from a thunderstorm, the crash killed 112, and injured 12 others.
Unseasonably chilly. High temperatures: Buffalo, NY 60 Jamestown, NY 53 Erie, PA 57 Dubois, PA 55 Pittsburgh, PA 63 Youngstown, OH 56