From Watts Up With That?
Lake Superior last froze over in 2003. It has now, again, frozen over. The frequency of freeze overs has historically been around once every 20 years. Now, in the last decade, we have seen two freeze overs.
The picture below is a beautiful satellite photo of Lake Superior from yesterday. With the well below freezing temperatures seen over the region Thursday night (-20 F), any isolated open water could have frozen.
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