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Special Marine Warning issued August 11 at 12:50AM CDT until August 11 at 2:00AM CDT by NWS Chicago IL

For the following areas... Nearshore Waters from Calumet Harbor to Michigan City... Open Waters from Wilmette Harbor to Michigan City out to Mid Lake... At 1249 AM CDT, a severe thunderstorm was located near Indiana Harbor, moving east at 15 knots. HAZARD...Wind gusts to 40 knots and large hail. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Large hail could result in structural damage. Locations impacted include... Burns Harbor and Marina Shores at Dune Harbor.