The Eastern Seaboard and Ohio Valley are bracing for another bout of severe weather, with potent thunderstorms predicted to roll through from Friday to Sunday. This weather system threatens to unleash torrential downpours, heightening the risk of flash flooding in regions of the Northeast already drenched earlier this week.
This turbulent weather pattern is fueled by a high-pressure system off the coast, which is pushing abundant moisture northward into these areas.
As this high pressure draws Atlantic moisture inland, a looming cold front promises to stir up showers and thunderstorms across the eastern United States, ensuring a weekend of changeable weather.
Starting Friday afternoon, a cold front will extend from the Great Lakes region down into the central Plains, triggering storms as it moves southeast toward the Northeast. This will likely lead to increased atmospheric instability, setting the stage for widespread showers and thunderstorms.
During the most intense storms, rainfall could reach up to 2.5 inches per hour. Given the already saturated ground in many of these areas, the risk of flash flooding remains significant, demanding vigilance throughout the weekend.
A Level 1 out of 4 flash flood risk is in place across much of the Northeast, Ohio Valley and Southeast through Saturday. This includes major cities such as New York City, Washington, DC, Charlotte, and Atlanta.
NOAA’s Storm Prediction Center (SPC) has also issued a Level 2 out of 5 risk of severe thunderstorms beginning Friday afternoon across a corridor from the tip of southwestern Connecticut and New York’s Lower Hudson Valley through eastern Pennsylvania and parts of New Jersey to the Delmarva.
This includes the I-95 corridor from New York City to Washington, DC. Damaging wind gusts are expected to be the main threat.
However, not everyone along the East Coast will experience heavy rain. Areas that miss out on the storms will instead contend with hot and humid conditions.
Heat alerts have been issued from Philadelphia to Boston, where heat index values could climb above 100 degrees in some locations. Those alerts could be extended into Saturday.
Residents across parts of the Northeast and Mid-Atlantic should expect widespread rainfall totals of 0.5 to one inch, with localized amounts of one to two inches or more where thunderstorms repeatedly track over the same locations through Saturday and Sunday.
Additional heavy rainfall could impact communities that experienced significant flash flooding last month.
For example, Bridgeport, CT, has recorded more than seven inches above average rainfall this year, while Albany, NY, is running more than five inches above average, leaving both areas more vulnerable to additional flooding.