It's been several decades since Lake Superior has completely frozen over, but experts project this year might be the year it does once more. According to NOAA's Great Lakes Coastal Forecasting System, estimated total ice area for February 12, 2014 is at 87.1%. The last time the ice extent was above 75% was in 1996. Last year the maximum extent was 38.4%. The current estimated mean thickness of the ice on Superior is 28 cm, but actual thicknesses vary greatly across the lake. The current ice c