* WHAT...High wave action and dangerous currents expected at Lake Michigan beaches. Waves 5 to 9 ft expected.
* WHERE...In Illinois, Lake, Northern Cook and Central Cook Counties. In Indiana, Lake and Porter Counties.
* WHEN...From late tonight through Wednesday morning.
* IMPACTS...Swimming conditions will be life threatening, especially for inexperienced swimmers. For information on swim advisories or bans at Chicago beaches: www. cpdbeaches. com.