Tornadoes hit Iowa, Nebraska, Kansas, Oklahoma, Tennessee and South Dakota.
At least 16 tornadoes were reported in six states overnight Tuesday morning.
Tornadoes were reported in Iowa, Nebraska, Kansas, Oklahoma, Tennessee and South Dakota.
The most destructive storm appears to have occurred in Barnsdall, Oklahoma, north of Tulsa, where significant damage was reported.
In addition to the tornadoes, 4-inch hail, the size of a softball, was reported in Kansas.
A tornado watch was issued Tuesday morning for parts of Missouri, including St. Louis, and Illinois. This watch was to be in effect until 8 a.m. local time.
The tornado watch in Arkansas has also been extended until 5 a.m. local time.
The NOAA Storm Prediction Center in Norman, Oklahoma, issued the highest possible Severe Weather Risk Warning for several intense, long-track tornadoes Monday afternoon and evening.
ABC News’ Kenton Gewecke and Melissa Griffin contributed to this story.
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