Extreme heat sweeps eastern US as death toll rises to 25

A record-breaking heat dome settled over the eastern half of the United States, contributing to at least 25 deaths and exposing millions of people to dangerous temperatures as readings climbed above 100 degrees Fahrenheit (38 degrees Celsius) in more than 20 states.

More than 140 million people remained under active heat alerts across the country as of 5 July, while officials warned of continuing risks as extreme temperatures shifted towards the mid-Atlantic and southeastern United States, says the Guardian.

New Jersey recorded the highest reported death toll linked to the heatwave, with officials believing extreme temperatures contributed to 22 deaths across 10 counties, mainly in central and northern parts of the state. Victims ranged in age from their mid-30s to their 80s and were found in locations including homes without air conditioning, on streets and inside parked vehicles.

In Mississippi, authorities reported two deaths in Hinds County. One involved a 74-year-old man found behind a petrol station, while another involved an 83-year-old woman who died after being exposed to the heat following a fall in her garden.

Illinois reported one death in Cook County, where heat stress was identified as a contributing factor to organic cardiovascular disease.

The extreme weather coincided with events marking the United States' 250th anniversary celebrations, leading to disruptions in public activities and emergency responses.

In Washington, DC, emergency services treated 51 people for heat-related illnesses during 4 July festivities, with 12 requiring hospitalisation.

Officials also cancelled the Independence Day parade in the capital, while the "Great American State Fair" on the National Mall was temporarily closed after 44 visitors required treatment for heat-related conditions.

The heatwave has also raised concerns surrounding major sporting events, including the FIFA World Cup final scheduled for 19 July in East Rutherford, New Jersey.

Scientists said such episodes of extreme heat reflect broader concerns surrounding the climate crisis and the need to reduce greenhouse gas pollution.

The National Weather Service and public health authorities described conditions as "life-threatening" and urged people to remain in air-conditioned environments, avoid prolonged exposure to the sun, drink sufficient fluids and check on relatives and neighbours, particularly older adults.

Forecasters said some relief was expected in parts of the north-eastern and midwestern United States as cooler air moved into those regions, although the most severe heat conditions were expected to continue shifting south and east.