St. Louis, Missouri – A line of thunderstorms could roll through eastern Missouri and southwest Illinois Tuesday into Wednesday, bringing lightning, brief downpours, and potential travel delays across the St. Louis metro and surrounding counties.
According to the National Weather Service in St. Louis, spotty thunderstorms are possible late Thursday night, but the greater risk begins Tuesday. A 50% chance of showers and thunderstorms is in place through midweek, affecting cities like St. Louis, Jefferson City, and Edwardsville. The storms could bring strong wind gusts, localized flooding, and poor visibility on major routes including I-70, I-64, and I-55.
Daytime highs will rise into the mid-80s across the region, adding heat and moisture that may fuel stronger cells. While severe weather isn’t guaranteed, NWS officials say residents should monitor updated forecasts and be prepared for lightning and possible brief power outages. Those with outdoor plans should consider alternate indoor options Tuesday and Wednesday.
The thunderstorm pattern may persist into Thursday. More advisories or warnings could be issued if stronger storms develop early next week.