A frost advisory will be in effect from 1 to 9 a.m. Wednesday, Oct. 16.
Temperatures as low as 32 degrees will result in frost formation, which could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. It is advised to take steps now to protect tender plants from the cold.
Portions of east central and southeast Missouri will be affected, as well as portions of south central and southwest Illinois.
The counties affected by the advisory in Missouri are Saint Louis County, Saint Louis City, Sainte Genevieve and Madison. The counties affected by the advisory in Illinois are Bond, Fayette, Clinton, Marion, Washington, Randolph, Madison, Saint Clair and Monroe. The cities affected include Salem, Chester, Cahokia, Alton, Edwardsville, Sparta, Centralia, Vandalia, Saint Louis and Belleville.