If this winter became the norm new signs would have to be posted. Some footprints in the snow went further than they should. Hopefully everyone that ventured out came back. Wikipedia's entry on shelf ice.
Ice has been causing trouble as far back as December last year. At that time Lake Michigan was 13 percent covered. New Year's Eve cruises had to be cancelled.
The coast guard employs an ice breaker named Biscayne Bay. Its currently stationed at Navy Pier.
Ice continues to advance across Lake Michigan. Compare these satellite photos taken four days apart; February 7th and 11th.
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