St. Louis, Missouri — One hundred sixty million Americans are prepared and monitoring what forecasters say is shaping up to be the largest snowstorm of the season, as winter storm warnings remain in effect across large portions of Missouri and Illinois through Monday, Jan. 26.
For Missouri and Illinois, the first phase of this system is expected to fall primarily as heavy snow. According to the National Weather Service, much of central and eastern Missouri and western and central Illinois is likely to see snowfall totals approaching or exceeding one foot. The highest accumulations are expected along and north of the Interstate 70 corridor, including the St. Louis metro area and surrounding counties.
The National Weather Service Weather Prediction Center places the Missouri–Illinois region within a high-confidence corridor for moderate to heavy snow impacts from Friday through Sunday. Snowfall rates may exceed one inch per hour at times, sharply reducing visibility and creating dangerous travel conditions along major routes, including Interstate 70, Interstate 64, Interstate 55, Interstate 44, and Interstate 57.
State transportation officials warn that prolonged snowfall could lead to extended road closures, disabled vehicles, and major delays for emergency responders and commercial traffic. Snow-covered highways, blowing snow, and rapidly changing conditions may make travel unsafe or impossible during peak snowfall, particularly overnight and early morning hours.
Residents are urged to complete storm preparations before conditions deteriorate, including stocking food, medications, and emergency supplies. Motorists are advised to avoid non-essential travel during periods of heavy snowfall and to closely monitor roadway conditions if travel cannot be postponed. Commuters, freight operators, and warehouse workers should expect disruptions that may extend into early next week.
Behind the storm, a surge of Arctic air is forecast to settle across Missouri, Illinois, and much of the Midwest. Temperatures are expected to plunge well below seasonal averages, with dangerous wind chills locking snowpack in place and prolonging hazardous conditions even after snowfall ends.
While a brief lull in snowfall is possible between Jan. 28 and Feb. 1, forecasters caution that the Midwest and East Coast will remain entrenched in a deep Arctic pattern into early February, limiting melting and extending winter impacts across the region.
