* WHAT...Dangerous swimming conditions. *Breaking Waves: 2 to 4 feet building to 3 to 5 feet. *Longshore current: Expected, moving north to south along the beach. *Structural currents: Expected, especially strong on the north sides of piers and breakwalls. *Rip currents: Expected * WHERE...In Indiana, Northern La Porte county. In Michigan, Northern Berrien and Southern Berrien counties. * WHEN...From 11 AM EDT /10 AM CDT/ this morning through this evening. * IMPACTS...Strong currents can pull swimmers into deeper water and high waves can sweep people off piers.