Days earlier, the same ferocious weather system spawned violent twisters, blinding dust storms and fast-moving wildfires, leaving at least 39 people dead in the South and lower Midwest. Here's what to know about the unusually erratic and damaging weather.

Eleven storm-related fatalities were reported in the Missouri counties of Ozark, Butler, Wayne and Jefferson, the state highway patrol said. Three people were confirmed dead in Independence County, Arkansas, the state's emergency management division said. Four were reported dead in Texas, officials said Saturday.

About 47 million people faced an enhanced to moderate severe storm threat from Madison, Wisconsin, to Birmingham, Alabama.