Lake Huron on the final freeze

 

In the good old days, the Bruce Nuclear Plant intake structure was crushed by the ice.  Lake Huron hasn't frozen over for a long time.  Now, you can see that all the 6C water has gone, and the 4C water is dominant.  When the water hits 4, it is at maximum density and sinks in lake winter turnover.  When you see just 2C water, it freezes almost instantly, because there is no more heat energy.  

We are currently getting heat energy from Lake Huron, which causes the snow flurries, but Georgian Bay is now dead (frozen).  I suspect the next big Arctic blob kills the lake and then Toronto is open to -30C.