St. Louis, Mo. – A narrow band of accumulating snow could create hazardous travel conditions late Sunday night, particularly along and north of the I-70 corridor between 9 p.m. and 3 a.m.
A mix of rain and snow is expected to develop across eastern Missouri and western Illinois overnight, with precipitation beginning as rain in many southern areas before transitioning to a rain-snow mix. Most snowfall is forecast to remain light and primarily accumulate on grassy and elevated surfaces.
However, forecasters warn that a narrow corridor may see 2 to 4 inches of snow, especially along portions of I-70 from Columbia through Troy and toward the St. Louis metro eastward into parts of west-central Illinois. Within this band, snowfall rates could briefly increase, allowing snow to stick to roadways and reduce visibility during the late evening and early overnight hours.
In St. Louis, road impacts are expected to be limited overall, but drivers traveling north of the city along I-70 should be alert for changing conditions. Columbia and areas toward Quincy may experience the greatest risk for measurable roadway accumulation.
Farther south toward Jefferson City and Farmington, precipitation is more likely to fall as rain or a light mix, with minimal accumulation expected.
Travelers should monitor conditions closely overnight, especially between 9 p.m. and 3 a.m. when the heaviest precipitation is expected. Reduced visibility and slick spots could develop quickly in areas under heavier snow bands. Conditions should gradually improve toward daybreak Monday as precipitation tapers and temperatures begin to moderate.
