The National Weather Service has issued a dense fog advisory until 9 a.m. Tuesday.
Counties included are Trego-Ellis-Ness-Rush-Pawnee-Stafford-Pratt.
Including the cities of La Crosse, Pfeifer, Macksville, Wakeeney, Stafford, Hays, Larned, St. John, Ness City and Pratt.
Visibility might be less than one mile, which might lead to dangerous driving conditions.
If driving, slow down, use your headlights and leave plenty of distance ahead of you.