Weather on I-57 in southern Illinois

Southern Illinois sees dense morning fog in the river bottoms, strong spring and summer storms, high summer heat and humidity, and occasional winter ice.

Fog

Fog is most common near the Mississippi and Ohio river bottoms south of Anna and around lakes such as Rend Lake. A truck stopped on the shoulder in fog needs flashers and triangles out immediately.

Storms and heat

Severe storms can bring high winds and hail. Summer heat pushes cooling systems and tires; check both before long runs.

Winter ice

Freezing rain is more common here than heavy snow. Bridges and overpasses ice first.