Heat 'dome' covers 1 million square miles

Some 141 million Americans over nearly 1 million square miles were under a heat alert on Wednesday, the result of a heat "dome" that's only slowly moving away from the central U.S. — and into the East Coast.

In Minneapolis, dozens of fans at recent Minnesota Twin games have been treated for heat issues, even though the club did take extra precautions such as providing free water stations and having first aid and guest service staff on hand to monitor crowds.

http://www.msnbc.msn.com/id/43820802/ns/weather/?GT1=43001