Add Weather as an interest to stay up to date on the latest Weather news, video, and analysis from ABC News.
In Ohio, all classes and after-school activities at Columbus City Schools were canceled Tuesday due to the heat.
Among the records highs on Monday were: 94 degrees in Cincinnati; 92 degrees in Indianapolis; 96 degrees in Atlanta; 98 degrees in Birmingham; and 100 degrees in Macon, Georgia.
Temperatures soared again on Tuesday, reaching 97 degrees in Nashville, 94 degrees in Dallas and 87 degrees in Washington, D.C. But at the same time, the West felt like winter: temperatures reached 37 degrees in Billings, Montana, and 47 degrees in Idaho Falls on Tuesday.
The record heat will move to the East Coast on Wednesday, with temperatures reaching 90 degrees in New York City and 95 degrees in D.C.
Meanwhile, residents from New Mexico to Michigan are under flood alerts. Some cities, already drenched, could see more than 4 inches of additional rain through Thursday.
Near Duluth, Minnesota, some roads were already submerged under water as heavy rain fell and rivers neared record flood stage.
ABC News’ Will Gretsky contributed to this report.