Storms sweeping into St. Louis tonight could bring hail, possibly tornadoes

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The National Weather Service St. Louis posted this graphic to Twitter showing expected times for storms to move through.

A severe thunderstorm watch is in effect until 9 p.m. Wednesday, with the possibility of hail.

The National Weather Service issued a severe thunderstorm watch for 20 counties in Missouri, including St. Louis County and St. Louis, and 16 counties in south central Illinois.

The storms could include very large hail, damaging wind gusts and a few tornadoes, the National Weather Service said.

The counties in Missouri under the watch include: St. Louis County, city of St. Louis, Jefferson, St. Charles, Warren, Lincoln, Franklin, Boone, Montgomery, Monroe, Knox, Shelby, Callaway, Audrain, Marion, Gasconade, Osage and Ralls.

In Illinois, the severe thunderstorm watch includes Monroe, Madison, Bond, St. Clair, Clinton, Montgomery, Fayette, Greene, Macoupin, Jersey, Washington, Marion, Brown, Calhoun, Adams and Pike.