Drivers south of Chicago and in northwest Indiana could encounter wet snow and slippery overpasses during Friday’s morning commute. A National Weather Service winter weather advisory runs from midnight to 10 a.m. Central time Friday, Nov. 13, for southern Cook and eastern Will counties in Illinois and Lake County in Indiana.

The advisory covers communities including Orland Park, Park Forest and Calumet City in Illinois and Hammond, Gary and Merrillville in Indiana. Forecasters say some spots could get 3 inches or more, especially away from the lakeshore near the state line. They expect the wet snow to make bridges and overpasses especially slippery. Visibility could drop where snow is falling most heavily.

A narrow band can make for a patchy commute

The weather service expects rain to mix with or turn to snow late Thursday night. The band could shift, leaving drivers with very different conditions just a few miles apart. The Lake County forecast calls for the heaviest effects overnight and Friday morning. The advisory does not cover all of Cook or Will County.

If you’ll be on the road Friday morning, check Getting Around Illinois or Indiana 511 for your route before leaving. The weather service advises slowing down in the snow and taking particular care on elevated roads. Rain or snow showers could return Friday night into Saturday morning, according to the Chicago forecast office.