East Coast faces double threat of flash flooding in the North and tropical downpours in the South
While the Northeast and Mid-Atlantic will face the greatest risk for flash flooding, tropical moisture will also fuel heavy rain and a few strong storms from the Carolinas into Florida.
More rain targets hard-hit parts of the Northeast days after historic rainfall
The Northeast's active weather pattern isn't over yet. Heavy rain and thunderstorms are expected to return on Sunday, raising the risk of flash flooding in parts of the region still recovering from this week's historic rainfall.
Another round of storms capable of causing flash flooding is expected to impact major cities on the East Coast to start the workweek.
A busy weather pattern will bring widespread showers and thunderstorms to much of the East on Monday.
(FOX Weather)
While the Northeast and Mid-Atlantic will face the greatest risk for flash flooding, tropical moisture will also fuel heavy rain and a few strong storms from the Carolinas into Florida, according to the FOX Forecast Center.
A slow-moving cold front will interact with plenty of moisture to produce multiple rounds of showers and thunderstorms across the Mid-Atlantic and Northeast.
Some storms could produce rainfall rates of 1 to 2 inches per hour, increasing the risk of flash flooding.
A few storms may also produce damaging wind gusts Monday afternoon and evening, but the overall severe weather threat remains limited.
(FOX Weather)
A Level 2 out of 4 flash flood threat is in place for cities including Philadelphia and New York City.
The storms will likely happen in multiple waves starting in the morning hours, according to the FOX Forecast Center.
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Not everyone in the region will see storms to start the day, with the highest chance being in New England, including eastern New York, Vermont, New Hampshire, Massachusetts and Maine.
(FOX Weather)
Later in the day, the cold front will move in and bring the chance for stronger storms directly over the Interstate 95 corridor.
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All storm activity is expected to end by the early evening hours as it pushes offshore.
Tropical moisture in the South
Farther south, tropical moisture will keep showers and thunderstorms active across the Carolinas, Georgia and Florida. The greatest flood concern will be across parts of the coastal Carolinas, where repeated rounds of heavy rain could lead to flash flooding.
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This includes places like Cape Hatteras, Wilmington and even down to Charleston, South Carolina.
(FOX Weather)
These storms will stay near the coast for the vast majority of the day.
Thunderstorms are expected to develop in the afternoon as temperatures climb in Florida and Georgia.
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The strongest storms could produce damaging wind gusts, along with torrential downpours before activity gradually drops off Monday night.
(FOX Weather)
The worst storms are likely in the Big Bend of Florida and potentially into Miami later in the day as the sea breeze kicks in, according to the FOX Forecast Center.
After Monday
After the cold front fades, in its wake will be a slow-moving upper-level system over the Southeast. As it stalls, it will pull in additional moisture, leading to multiple days of widespread showers and thunderstorms.
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Image 1 of 6A pedestrian crosses the street as rain falls on downtown Fort Worth, Texas, on Wednesday, June 17, 2015. (Khampha Bouaphanh/Fort Worth Star-Telegram/Tribune News Service)
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Image 2 of 6CALIFORNIA, USA - FEBRUARY 16: A view of flash flood on I-405 Highway near Sawtelle neighborhood during heavy rain in Los Angeles, California, United States on February 16, 2026. ((Photo by Tayfun Coskun/Anadolu via Getty Images))
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The biggest concern with this setup is more heavy rain. Storms will move slowly and could repeatedly develop over the same areas, increasing the flash flood risk.
A Level 1 out of 4 flash flood threat is in place for both Tuesday and Wednesday.
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The greatest flooding concern stretches from the Deep South into the Tennessee Valley and southern Appalachians.
(FOX Weather)
The severe weather threat is expected to remain limited. However, a few of the stronger storms could still produce strong wind gusts, along with frequent lightning.