There will be three, four, maybe five days in a row of a persistent heat dome with hot, humid, sunny conditions over a good portion of the Eastern U.S.,” said Bryan Jackson,

Summer will make a dramatic entrance in the U.S. this week with a heat dome that will bring stifling heat and uncomfortable humidity to millions.

Millions of Americans are facing oppressive heat, with forecasters expecting a "heat dome" to develop over parts of the county over the weekend and through next week. The National Weather Service (NWS) warns that heat related illnesses increase significantly during extreme heat events.