Missouri/Illinois – Rain will quietly transition to snow after midnight across the St. Louis region, and even light accumulation could create slick spots by the early Tuesday drive.
According to the National Weather Service in St. Louis, a narrow band of snow is expected to develop after midnight and continue through about 8 a.m. Tuesday. While totals remain uncertain, some areas—especially north and east of St. Louis—could see up to 1 to 2 inches. Confidence in exact placement remains low, meaning impacts will vary widely.
Across St. Louis, Columbia, and into west-central Illinois, most accumulation is expected on grassy and elevated surfaces. However, brief bursts of snow could still coat bridges and overpasses, particularly along I-70, I-64, and I-55. Drivers should watch for isolated slick spots, especially toward sunrise when temperatures are coldest.
Further northeast toward areas like Quincy and Springfield, Illinois, the chance for measurable snow increases slightly. Still, this is not a widespread winter storm—rather a quick-moving, narrow corridor that could shift before arrival.
The key concern is timing and surface temperatures. If snowfall rates increase even briefly, roads could become slick in localized areas despite marginal conditions.
Conditions improve by late morning Tuesday as precipitation exits and temperatures gradually rise.
Stay alert for changing conditions overnight. Are you expecting rain or snow where you are early Tuesday?
