Illinois, Missouri Severe Thunderstorm Warning | Effective 04/17/2026 13:47

Headline: 
Severe Thunderstorm Warning issued April 17 at 3:47PM CDT until April 17 at 4:15PM CDT by NWS St Louis MO
Event: 
Severe Thunderstorm Warning
Urgency: 
Immediate
Effective: 
April 17, 2026 - 1:47pm
Expires: 
April 17, 2026 - 2:15pm
Description: 
At 347 PM CDT, a severe thunderstorm was located over St. Charles, moving northeast at 30 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. Locations impacted include... Cottleville, St. Peters, St. Charles, Maryland Heights, St. Ann, Lambert-St. Louis International Airport, Hazelwood, Bridgeton, Berkeley, Florissant, Black Jack, Elsah, West Alton, Grafton, Godfrey and Alton. This includes the following State Parks... First Missouri State Capitol Historic Site and Pere Marquette State Park. This includes Interstate 70 in Missouri between exits 220 and 231.
Instruction: 
Seek shelter inside a well-built structure and stay away from windows. This storm is capable of producing damaging winds and large hail. A Tornado Watch remains in effect until 1100 PM CDT Friday for portions of southwest Illinois and east central Missouri.
Area Description: 
Calhoun, IL; Jersey, IL; Madison, IL; St. Charles, MO; St. Louis, MO
Forcast Office: 
NWS St Louis MO