Washington, D.C. — Residents and travelers across the mid-Atlantic are facing an increased risk of flash flooding and torrential thunderstorms as multiple rounds of storms are expected to move through the central and eastern United States into this weekend.
The threat is particularly concerning along the heavily populated corridor stretching from Washington, D.C., through Philadelphia and toward New York City, where repeated rainfall could overwhelm drainage systems and cause rapid flooding.
AccuWeather meteorologists have identified portions of the mid-Atlantic as an area of heightened concern, with several rounds of thunderstorms potentially affecting the region through Sunday.
Repeated Storms Could Bring Torrential Rain
The biggest concern is not necessarily one individual thunderstorm, but the possibility of multiple rounds of heavy rainfall hitting some of the same locations within a short period.
A dip in the jet stream is expected to help trigger disturbances capable of producing thunderstorms and torrential downpours. Some of these storms could move slowly, allowing extremely heavy rainfall to accumulate quickly.
Meteorologists warn that certain areas could receive a couple of inches of rain in as little as one hour.
That becomes especially dangerous when another storm develops over an area that has already received substantial rainfall less than 24 hours earlier.
D.C. to New York Faces Heightened Flood Risk
Dozens of major metropolitan areas across the eastern United States could experience flash flooding into the weekend, but the zone from Washington, D.C., to New York City is expected to face a particularly elevated threat.
Small streams and drainage channels can rise rapidly during intense rainfall. Roads and neighborhoods that are not protected from flooding could quickly become inundated.
Urban areas may face additional problems because storm drains can become overwhelmed, allowing water to collect on streets and highways.
Subway stations and other low-lying transportation areas could also experience flooding if rainfall rates become intense enough.
Afternoon and Evening Storms Could Disrupt Travel
Most thunderstorms are expected to develop during the afternoon and evening hours, although residents should not assume the overnight period will be completely safe.
Some storms could produce torrential rain late at night and continue past daybreak.
For people traveling along the Atlantic Seaboard, the storms could create significant transportation problems. Heavy rain can sharply reduce visibility, while flooding may block roads and cause delays on major highways.
Drivers should be especially cautious around flooded roads, where water depth can be difficult to judge.
Severe Storms Possible Beyond the Mid-Atlantic
The flash flood threat is not limited to the East Coast.
Thunderstorms could become severe from portions of the Plains into the Eastern states during the coming days. Even storms that do not reach severe criteria can still produce dangerous rainfall and localized flooding.
Around the Great Lakes, some thunderstorms may also produce waterspouts and small hail through the weekend.
By Sunday, enough dry air could move into portions of the mid-Atlantic west of Interstate 95 to reduce the coverage and duration of showers and thunderstorms. However, intense storms could still redevelop along the immediate coast and into New England.
Cooler Weather Arrives Across the Northeast
The storm system will also bring a noticeable change in temperatures.
The core of the cooler air associated with the jet stream dip is expected to settle over the Great Lakes and interior Northeast through the weekend and into early next week.
Daytime temperatures in those areas could run 5 to 10 degrees Fahrenheit below historical averages for this time of year.
The East Coast and areas near the warm Atlantic could see temperatures only a few degrees below average by early next week.
Meanwhile, people looking for sunshine and heat will find a very different pattern farther south. Texas and the South Central states are expected to experience widespread temperatures in the mid-90s to low 100s over the coming days.
Fog Could Follow the Storms
Cloud cover may limit nighttime and early-morning fog across parts of the region. However, where skies clear after rainfall, moist ground could produce locally dense fog, particularly near lakes and rivers.
The combination of heavy rain, flooding, reduced visibility and severe thunderstorms could make travel challenging across parts of the East Coast through the weekend.
Are you expecting severe weather or heavy rain in your area this weekend? Share your local forecast and weather concerns in the comments below.