A dangerous heat dome has enveloped the Midwest, South and East Coast, bringing prolonged extreme heat to more than 30 states this week.

A heat wave will blast a large swath of the U.S. this week. The National Weather Service says temperatures will feel hotter because of the high humidity that's arriving with it.

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.”

Meteorologist Ryan Maue described it as a "mega heat dome" ...

Sweltering conditions are expected to last through the weekend