The St. Louis area experienced unprecedented rainfall on Election Day, leading to significant flash flooding that closed schools, disrupted traffic, and affected polling locations. Over six inches of rain fell, prompting flooding warnings across Missouri and four neighboring states. In Jefferson County, a polling site was blocked, forcing some voters to be redirected. Residents of De Soto faced flash flood concerns near Joachim Creek, while a levee in St. Francois County neared failure, prompting evacuations. Heavy rains also led to water rescues and power outages in the region, as local authorities warned of continued severe weather and flash flood risks. Numerous road closures and school shutdowns were reported due to the flooding effects, further complicating the voting process in affected areas.