A "heat dome" has developed on the East Coast that could send temperatures to 100 degrees in Boston this week. As a result, an extreme heat warning is in effect now through Tuesday for much of Massachusetts.

An "extremely dangerous" tornado could hit a U.S. state on Sunday evening. The National Weather Service is warning of a tornado outbreak on Sunday. Severe weather, including strong winds, heavy rain, large hail and possible tornadoes are possible across many U.S. states on Sunday. One U.S. state is ...