On Monday, severe storms are forecasted to sweep across the mid-Mississippi valley and Midwest regions of the United States, posing risks to nearly 50 million people. The Storm Prediction Center has issued a level 4 out of 5 risk for severe thunderstorms in areas of southwest Illinois and southeast Missouri, including St. Louis. Forecasters predict the possibility of multiple strong tornadoes, damaging wind gusts reaching 60 to 70 miles per hour, and large hail, with some stones potentially the size of baseballs. The National Weather Service (NWS) warns of significant impacts, including damage to vehicles, trees, and structures. Kansas City fire battalion chief Riley Nolan reported responding to 11 water rescues due to heavy rains, although no injuries were reported. Tornadoes could reach EF2 to EF3 strength, prompting the NWS to advise residents to take precautions, such as moving to interior rooms and avoiding windows. The severe weather threat is expected to persist throughout the week, with additional thunderstorms and flash flooding anticipated as a cold front moves southward.