According to NOAA satellites and NOAA research, Great Lakes ice cover is the most extensive since mid-90s.Persistent cold temperatures in the Midwest this winter have almost completely frozen over many of the Great Lakes. The Great Lakes Environmental Research Laboratory (GLERL) reported that 88% of the Great Lakes were frozen as of mid-February 2014. The last time ice cover was even close to this extent was in 1996.
The map by NOAA shows ice coverage on the Great Lakes on February 13 2014. Shades of blue indicate ice concentration, with the darkest shade of blue indicating areas where 0-10% of the water’s surface is frozen and white indicating areas where the water is entirely frozen over. Lakes Superior, Erie, Huron, and St. Clair were 90-100% ice covered, while Lakes Michigan and Ontario were 82% and 43% ice covered, respectively. Overall, 88% of the Great Lakes were frozen on this date—the most extensive total ice coverage observed so far this winter.