Visitors to Chicago's lakefront on Tuesday will need to be careful, the National Weather Service is warning.
According to the NWS, swimmers should stay away from the city's beaches and runners and bicyclists using the lakefront path should be extra cautious.
A cold front and strong winds moving over the warm waters of Lake Michigan will bring "rogue" waves that could be as high as 15 feet, according to the Chicago Tribune.
The waves are dangerous in that they could sweep even experienced swimmers out into the water.
The Chicago Park District already issued swim bans at seven of the city's beaches -- all on the Far North Side -- as of Monday afternoon: Fargo, Howard, Jarvis, Juneway, Leone, Loyola and Rogers, DNAinfo Chicago reports.
The front is also bringing cooler temperatures into the city on the heels of the first heat wave of the year. The Chicago Weather Center reports Tuesday's high will only hit the upper 70s and Wednesday will be slightly cooler than that.