Several tornadoes touched down from Oklahoma to Iowa, including near Wichita, Kan., and Oklahoma City, on Sunday.
Rising temperatures and humidity across the mid-Atlantic will have it feeling like the end of June.
Heavy rain returning to the northern Plains will generate a renewed flood threat for the Red River.
A tornado touched down at about 2:53 p.m. CDT Monday in Moore, between Norman and Oklahoma City.
More severe weather is on the way for the southern Plains on Tuesday as well as parts of the Midwest and the Northeast.
Reports from Monday's severe weather.
Ohio Valley (1860)
Tornado swarm in Ohio Valley hit Louisville, KY, Cincinnati, OH, Chilicothe, OH, and Marietta, OH. Damage totalled $1 million; 4 people killed in Cincinnati.
Orlando, Fl (2005)
High temperature finally reached 90 degrees. This gets a record for the latest occurrence of the first degrees day of the year.
Texas County, OK (1937)
Severe dust storm called "Black Blizzard" visibility near zero for 10 minutes.