Heatwave disrupts Fourth of July events across eastern US

Forecasters and government officials warn that the heatwave could prove deadly

A dangerous heatwave upended Fourth of July celebrations across much of the central and eastern US on Friday, forcing officials to cancel or postpone dozens of parades, concerts and fireworks displays as the nation marked its 250th birthday.

The Great American State Fair on the National Mall in Washington — a centerpiece of President Donald Trump's efforts to mark the nation's 250th birthday — was among the events disrupted by the sweltering heat, temporarily closing on Friday afternoon amid temperatures of 101 degrees Fahrenheit (38 degrees Celsius).

Organisers said it was expected to reopen at 5pm, weather permitting, with modifications like cooling tents and misting stations.

Record-breaking temperatures spread to the eastern US from the Midwest earlier this week, and over 185 million people were under heat alerts on Friday, the National Weather Service said, with peak heat indices potentially reaching up to 115 degrees Fahrenheit (46 C) in many parts of the country.

Forecasters and government officials have warned that the heat wave could prove deadly, urging Americans celebrating the Fourth of July weekend outdoors to stay hydrated, seek shade and watch for signs of heat illness at gatherings and public events.

Event cancellations have been reported in at least seven states, including a major Independence Day parade in Philadelphia as well as events in Maryland's Takoma Park and Loudoun County, Virginia.