By Kyle Elliott, AccuWeather meteorologist
July 24,2017, 10:39:27AM,EDT
A brief blast of September-like air will follow the rounds of thunderstorms and torrential downpours in the northeastern United States early this week.
Skies opened up and thunderstorms slammed the mid-Atlantic states on Sunday and Sunday night.
Many locations in the mid-Atlantic received 1 to 3 inches of rain through Sunday night, but localized rainfall amounts of up to 6 inches turned roadways into rivers and streams into raging torrents of water.
While the intensity of the rain will diminish to an extent as it moves across New England into Monday evening, the potential for localized flash flooding remains in cities such as Hartford, Connecticut; Providence, Rhode Island; and Worcester, Springfield and Boston, Massachusetts.
Another zone of heavy rain will eye areas from upstate New York to northern Vermont, including the city of Burlington.
Any localized heavier downpour or series of downpours that linger over an area for an extended period of time can heighten the risk of destructive flash flooding. Residents living along streams and creeks should remain abreast of flash flood advisories.
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"There will be areas that experience persistent heavy rain over a 2-3 hour period which will cause street flooding and make some roads impassible for a time, as well as trigger flight delays," according to AccuWeather Senior Meteorologist Mike Doll.
The risk for vehicles hydroplaning and multi-vehicle collisions increases greatly at highway speeds when downpours quickly reduce roadway visibility to near zero.
"Flooding could lead to road closures, and ripple-effect flight delays even after the heavy rain departs," AccuWeather Senior Meteorologist Kristina Pydynowski said.
Areas south and west of New York City should see generally drier conditions into Monday evening, although a few gusty afternoon thunderstorms may threaten areas in the interior mid-Atlantic from western Maryland to south-central New York.
After the storm system responsible for the violent weather pushes off the Eastern Seaboard on Monday evening, the cooler air will expand over the entire northeastern United States by Tuesday.
High temperatures will be stuck in the 60s and 70s for a few days across the northern mid-Atlantic and New England, which is 10 to 15 degrees Fahrenheit below normal for late July.
The cooler air will be a stark contrast to the extreme heat and humidity scorching the eastern U.S. during recent weeks.
"Some locations that had high temperatures in the 90s late last week will not get out of the 60s both Monday and Tuesday," Doll added.
The change in temperatures will be less dramatic, in areas farther south in the mid-Atlantic.
While temperatures in the lower to middle 70s replace highs in the 90s in New York City, highs will be held just below 90 F in Washington, D.C., and near 80 F in Philadelphia on Tuesday.
At this level, temperatures will be more typical for September.
Temperatures will rebound in parts of the Northeast on Wednesday, but cool, easterly winds and limited sunshine may allow Wednesday to be equally or slightly cooler than Tuesday from Philadelphia to Washington, D.C.
By the end of the week, heat, humidity and the threat for disruptive thunderstorms may chase away the early preview of autumn across the northeastern U.S.
How come the "polar vortex" never seems to hit during these months??