Severe storms are set to take aim from the Great Lakes to the Southern Plains on Tuesday. The system will bring the threat of damaging winds, large hail and tornadoes to places like Oklahoma City, St. Louis, Louisville, Columbus, Pittsburgh and Buffalo. The threat continues on Wednesday for parts of the Southern Plains, including Dallas-Fort Worth, as the cold front gets stuck over the region. Due to this stalled front, there will also be a multiday flash flood threat Tuesday into Wednesday encompassing many of the same areas. Here’s what you need to know.