Extreme heat is fueling the risk for severe storms in the Northeast and Mid-Atlantic today, where a level 3 out of 5 severe storm threat exists for Washington, D.C. and surrounding areas. The storms could threaten fireworks shows with intense wind and rain.
PHILADELPHIA — Severe thunderstorms are expected to continue across parts of the Northeast and Mid-Atlantic through the July 4 holiday weekend.
While they won’t be enough to break the historic heat wave baking the region, they could disrupt nighttime fireworks celebrations with damaging wind gusts and heavy rain.
Storms could also delay travelers at major East Coast airports and create brief periods of difficult driving for holiday road-trippers.
INTENSE HEAT WAVE BAKES 260M AMERICANS WITH LIFE-THREATENING TEMPERATURES LINGERING AHEAD OF NATION’S BIRTHDAY
Sweltering temperatures across the region approaching and exceeding 100 degrees, combined with high humidity are fueling thunderstorm development Saturday.
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NOAA’s Storm Prediction Center issued a level 3 severe storm threat across the Mid-Atlantic, including Washington, D.C.
Severe weather threat Saturday
(FOX Weather)
According to the FOX Forecast Center, storms could produce damaging downbursts — concentrated bursts of straight-line winds in excess of 60 mph — Saturday evening, potentially jeopardizing America 250 fireworks shows.
A wider level 2 out of 5 storm threat covers New York City, Philadelphia and Richmond, Virginia.
WHAT IS A DOWNBURST?
FILE – NEW YORK, NY – JULY 4: Fireworks light up the sky over the East River and Brooklyn during the Macy’s Fourth of July fireworks show on July 4, 2025, in New York City.
((Photo by Gary Hershorn/Getty Images) / Getty Images)
Meanwhile, the ridge of high pressure responsible for the oppressive heat dome will begin shifting south Saturday, bringing the most intense heat to the Mid-Atlantic and the Carolinas.
As the ridge shifts south Saturday, it will open the door to a more active thunderstorm pattern.
HOBOKEN, NJ – JULY 3: Lightning strikes One World Trade Center as the sun sets in New York City on July 03, 2026, as seen from Hoboken, New Jersey.
(Gary Hershorn/ / Getty Images)
Because the atmosphere is heavily laden with moisture, a Level 1 out of 4 risk for flash flooding is in effect on Saturday, warning that slow-moving storm cells could cause localized flash flooding in urban areas and low-lying zones.
While the intense heat begins to ease by Sunday, the severe weather threat will linger into the afternoon. A maintained Level 2 out of 5 threat for Sunday afternoon and evening across parts of the Mid-Atlantic, as developing thunderstorm clusters ahead of a shifting front could generate another round of damaging wind gusts.
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By Sunday into Monday, the severe weather threat begins to ease alongside the intense heat, but the heavy rainfall threat will intensify.
Flash flood threat
(FOX Weather)
A Level 2 out of 4 flash flood risk is in place across portions of southern Pennsylvania, the Delmarva, as well as the Philadelphia area on Monday.
A widespread 1 to 2 inches of rain is expected across the region through Wednesday, with pockets of 2-3 inches of rain expected across eastern Pennsylvania and north Jersey.
