Heat takes a mounting toll

A prolonged spell of dangerous heat had become a deadly public-health emergency by the event date of July 5, 2026. Officials believed the conditions were connected to at least 25 deaths, although those cases remained suspected rather than a final nationwide tally. New Jersey accounted for most of the reported loss of life: the state Department of Health recorded 22 deaths spread among 10 counties. Officials also reported two deaths in Hinds County, Mississippi, and one in Cook County, Illinois.

The strain was visible beyond the fatality reports. New York City's Health Department said more than 378 people had gone to emergency rooms for illnesses associated with heat. About 40 million residents faced heat advisories or other alerts in eastern, southeastern and southwestern parts of the country. The previous day's holiday celebrations coincided with records falling in at least 18 locations, including Washington, Baltimore, Raleigh, Norfolk and Atlantic City.

Oppressive conditions shift west

On the East Coast, forecast heat-index readings of 100 to 105 degrees were expected in Philadelphia, Washington, Baltimore, Raleigh, Charleston and Jacksonville. The index combines temperature and humidity to describe how hot conditions feel to the body. Relief was forecast later in the week, when daytime temperatures across much of the East were expected to settle broadly between the 70s and the low 90s.

The threat was not ending nationwide. Watches for extreme heat were scheduled from Tuesday through Thursday in portions of Arizona and California, covering Phoenix and Tucson among other communities. Forecasters warned that southwestern highs could reach 114 degrees through the middle of the week.

Storm damage adds another layer

Heat was unfolding alongside disruptive storms and extensive electricity outages. More than 215,000 customers in Michigan lacked power, as did about 151,700 in Pennsylvania and 94,200 in New Jersey, according to figures cited from PowerOutage.us. Across the central and eastern United States, Saturday generated more than 540 reports of damaging wind gusts. Reported peaks included 92 mph in Norman, Oklahoma, and 87 mph in Suffolk County, New York.

Another 25 million people were covered by storm alerts on Sunday. Parts of the Plains, Southeast and mid-Atlantic faced scattered thunderstorms capable of producing winds above 70 mph and hail roughly the size of a quarter. Forecasters considered the tornado threat comparatively low, but warned that lightning and storms could disrupt travel at numerous major airports.

Flooding was also a concern for 34 million people from Delaware through Connecticut into Monday. Moist, slow-moving storms could produce localized flash floods, particularly in the mid-Atlantic. New York City officials advised residents to prepare for heavy rain through Tuesday; forecasts allowed for as much as 3 inches in the city, including short bursts at rates of 2 inches an hour. Across the wider affected area, projected totals ranged from 2 to 8 inches. Taken together, the forecasts described overlapping risks: dangerous heat, interrupted power and storms capable of quickly inundating urban streets and low-lying spaces.