Heat-trapping high pressure systems can sit over an area for a week or longer

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

A heat wave will blast a large swath of the United States this week. The National Weather Service says temperatures rising ahead of the July 4th holiday will feel hotter because…

A heat wave will blast the eastern United States this week

Sweltering conditions are expected to last through the weekend

These unbearably hot and humid summer months are typically made possible by phenomena known as “heat domes.”

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…