The same cold front poised to mark an end to the midsummerlike warmth will also spread rain and thunderstorms into the region this weekend.
Warmth and humidity will re-surge in the Northeast with highs in the 80s F in most areas during the first part of the weekend. However, rather than marking another long stretch of warm days, the warmth will be truncated.
Showers and thunderstorms will develop over the Ohio Valley and eastern Great Lakes on Saturday and will push into the Appalachians Saturday evening.
The rainfall will be associated with a cool front that will make steady progress into Sunday before slowing down over the mid-Atlantic and southern New England coast by early next week.
While a brief stray thunderstorm cannot be ruled out on Saturday afternoon, the wet day of the weekend in the Interstate 95 Northeast will be Sunday.
People who have outdoor plans from Boston to Washington, D.C., should take along some rain gear on Sunday. MLB games in Philadelphia, New York City and Baltimore could be affected by rain.
According to AccuWeather Meteorologist Eric Leister, "Showers and thunderstorms will push from the Appalachians to the coastal plain during Sunday midday and afternoon."
Some locations may receive their most significant soaking of the entire month. An inch of rain could fall in places with higher amounts in some neighborhoods.
"The showers and thunderstorms will push into the Dover, Delaware, area, where fans and drivers at the Monster Mile may face delays or a rain-shortened NASCAR race on Sunday afternoon," Leister said.
The rain could come fast enough and last long enough to postpone the FedEx 400 Benefiting Autism Speaks race until Monday.
As the front's forward speed slows, rain may linger Sunday night into Monday over Virginia, Maryland, Delaware, southern Pennsylvania, New Jersey and coastal New York.
Much cooler air will settle into the Appalachians by Sunday with temperatures 15-20 degrees Fahrenheit lower, when compared to Saturday. The cooler air will begin to move in east of the Appalachians on Sunday but will take hold Sunday night into Monday.
The clearing and drying process may be slow to evolve from Virginia to Long Island during into the middle of next week.