text:  It could become rather dominant in the east in July, linger into August, and at times that could build into parts of the Midwest and even in parts of the west. So this could go down as one of the hotter summers on record, at least for parts of, say, the eastern U.S., southern U.S., and parts of all the Rockies and the southwest as well. So is the heat dome the same one that could be around, or does it dissipate and another one forms? How does a heat dome work?