Tornado threat grows near St. Louis as severe storms slam Midwest

The most dangerous window for St. Louis ran from about 4 p.m. to 9 p.m. Monday, when forecasters said storms could sweep through with damaging winds, large hail and tornadoes. The Storm Prediction Center upgraded much of the region to a Level 4 out of 5 severe weather risk, signaling a high-end threat for the metro area.

A tornado warning was issued for St. Louis Monday as the severe weather threat stayed elevated through the afternoon and evening. The National Weather Service said storms were expected to arrive in the region Monday afternoon and move west to east, with development in mid-Missouri before the line reached St. Louis. The broader outbreak was expected to affect more than 50 million to 64 million people across the Midwest and Mississippi Valley, with forecasts warning that strong or even intense tornadoes could develop in Missouri and Illinois.

The danger was not limited to wind and rotation. The NOAA National Weather Service office in St. Louis listed multiple active hazards on Monday, including a tornado warning, severe thunderstorm warning, flash flood warnings, flood warning, severe thunderstorm watch, flood advisory and flood watch. That mix pointed to a fast-moving storm system capable of producing both violent weather and water-related hazards in the same area.

The current round of storms added to an already punishing spring pattern across the central U.S. A significant tornado outbreak struck the Upper Midwest on April 17 and 18, and St. Louis had already been preparing for a season of repeated threats. The City of St. Louis marked Severe Weather Awareness Week from March 2 to March 6 and said it had strengthened severe-weather preparedness after the May 2025 tornado, a signal that local officials were treating this spring as a sustained risk rather than a one-day event.

For residents, the immediate concern was simple: stay near alerts and act quickly when warnings are issued. With a Level 4 risk, active tornado warnings and flooding hazards all in play, the St. Louis region faced one of the most serious severe-weather setups of the season, and the larger Midwest outbreak showed how far the storm pattern had spread.