Forecasters said scattered to numerous severe storms will be possible this afternoon and into tonight along and ahead of a cold front.
While most in the St. Louis area will see a marginal risk for severe weather, southern parts of the area will have a slightly higher risk, with the most severe chances being near Cape Girardeau, Missouri.
The storms will be fast-moving, racing to the northeast at 50 to 60 miles per hour (80 to 97 kph), said Bill Bunting, chief of forecast operations at the Storm Prediction Center in Norman, Oklahoma. A Tornado Warning means rotation has been spotted.More news: Novak Djokovic stunned by Kohlschreiber, 35, is keen to 'turn the page'
The National Weather Service has issued a tornado watch for Lafayette County until 5 p.m. Saturday. After the line of storms moves east later this morning, the rest of Saturday will be warm, sunny, and windy.
NORTHWEST ARKANSAS: The biggest threat for Northwest Arkansas is large hail this morning with a chance for some gusty winds with the thunderstorms. That poses a particular danger as many people are often asleep.
National Weather Service meteorologist Marlene Mickelson, based in Memphis, Tennessee, says there were no reports of deaths or injuries though the winds were strong enough to cause the building damage.More news: Tennessee will face Mississippi State Friday night in SEC Tournament
Rain could help cool the atmosphere and block the heat that fuels severe storms. Forecasters said numerous affected areas were also at risk of flooding.
The severe weather threat ends across northeast MS during the early evening.
President Donald Trump planned a Friday visit to Lee County, Alabama, where a tornado outbreak across the Southeast last Sunday wreaked its worst havoc, killing 23 people.More news: Google announces Android Q: New features revealed in beta version
The watches come just a week after powerful twisters swept through Alabama and killed 23 people. The strongest storms will be along and south of I-40.