As cooler air drives into the sea of heat and humidity in the East, locally powerful thunderstorms will continue to develop into this evening.
Relief is coming for those with heat-sensitive health problems, but big thunderstorms are marking the transition.
There is a risk of strong to perhaps damaging thunderstorms this afternoon and evening along the I-95 corridor from Richmond to Washington, D.C., Baltimore, Wilmington, Philadelphia, Trenton, New York City, Hartford, Providence and Boston.
While the storms will not be severe in every neighborhood, they can bring a brief period of damaging wind gusts and blinding downpours to many locations.
A few communities can be hit with downed trees and power outages, frequent lightning strikes, urban flooding and hail.
Much cooler and drier air will work in aloft, while the air remains hot and humid at the surface into this evening.
This setup produces an unstable atmosphere that can be made acute by the approach of the cooler air at the surface.
Folks spending time outdoors into this evening should keep an eye out for rapidly changing weather conditions and seek shelter in a building away from windows as storms approach.
In addition to the heat, the approach of the storms could lead to delays at area airports and poor visibility on the highways, due to blinding downpours.
Multiple tornadoes touched down across Indiana and Ohio on Wednesday, one of which flattened a Starbucks in the town of Kokomo, Indiana.
A budding tropical disturbance has the potential to strengthen significantly and reach Florida and the Bahamas with strong winds, coastal flooding and torrential rainfall during Sunday and Monday.
Showers threaten to put a damper on some festivities during the Late Summer Bank Holiday, especially early in the weekend.
Rounds of showers and thunderstorms will bring the potential for flash flooding and localized damaging wind gusts through Thursday.
One of the most widespread and intense heat waves of the summer will be entrenched across most of Germany through the weekend.
Stargazers will want to dig out their binoculars and telescopes this weekend as Venus and Jupiter shine so close that they appear as one large, bright star in the evening sky.
Sturtevant, IN (2001)
A tornado 3 miles north-northwest of town. The tornado destroyed a hay barn with a horse trailer pushed out the back of the barn. A power pole was snapped off and wires were downed near Old Highway 11. A speed trailer near Highway 11 and I-94 was destroyed. Large barricades were lifted from the south side of Highway 11 and moved to the north side. Total losses exceeded $30,000. The path length of the tornado was 3 miles.
Washington, D.C. (1814)
Tornado struck part of Washington, D.C., killing many British soldiers who were burning the capitol.
South Carolina (1885)
Hurricane struck SC; $1.3 million damage at Charleston with many fatalities.