Record-Breaking Heat Wave Sweeps Across Central and Eastern U.S.

Forecasters predict dangerously high temperatures across central and eastern United States this week. The heat is anticipated to persist through the Fourth of July holiday weekend, possibly breaking records in some areas.

Marc Chenard, a meteorologist with the Weather Prediction Center, reports that temperatures will reach the 90s and low 100s from the Midwest to the East Coast. Specific areas, especially the Mid-Atlantic and Northeast, may see temperatures soar above 100 degrees.

“Washington, D.C. is likely to exceed 100 on at least one or two days,” stated Mr. Chenard. “Philadelphia and New York City are also forecasted to surpass 100.” In Washington, New York City, and Philadelphia, records might be shattered later in the week. June’s record high of 104 degrees in Philadelphia might be equaled.

The onset of the heat wave is expected on Sunday across parts of the Plains with temperatures rising into the 90s. By Tuesday, the heat will expand to the Great Lakes region, including Chicago, and reach the Gulf Coast. By Wednesday, the East Coast will experience extreme heat.

High humidity will accompany the high temperatures, intensifying the oppressive conditions. The National Weather Service mentions heat index values could reach up to 110 degrees, with some areas feeling up to 115.

Nighttime will offer little relief as nighttime temperatures remain unusually high. Chenard predicts minimum temperatures to stay in the 70s, with some cities possibly remaining even warmer. He highlights that New York City, Philadelphia, and Washington, D.C., might have nights where temperatures do not dip below 80. Chicago could see similar conditions early in the week.

The oppressive heat and humidity are set to persist through much of the holiday weekend. Chenard attributes the prolonged heat to a broad, stable high-pressure system or “heat dome.” This system is expected to move west later, bringing cooler temperatures to the East and the possibility of thunderstorms.

Nazaneen Ghaffar reports on the weather for The Times.