A dangerous heatwave is set to engulf large parts of the central and eastern United States from Tuesday through the July 4 holiday weekend. Forecasters have warned of extreme temperatures and oppressive humidity during the country's 250th Independence Day celebrations and the FIFA World Cup knockout stage.

Forecasters warn of triple-digit heat indices and blazing hot temperatures that could break records and linger through Independence Day.

Dangerous heat is expected across large swaths of the U.S. this week, according to the National Weather Service.

A heat wave will blast the eastern United States this week

Sweltering conditions are expected to last through the weekend