Friday, February 09, 2007

Has Lake Michigan ever frozen over completely from shore to shore?

 

February 8, 2007

Manistique, Michigan

Photographer states :: Frozen over.

Manistique is the very northern reach of Lake Michigan. Lake Michigan is frozen. I sure don't see any white caps out there. Lake Michigan never freezes.


Trends in Lake Michigan Ice Cover (click on)

It is rare that Lake Michigan freezes over completely. Despite the area¹s reputation for harsh winters, the only year we are certain Lake Michigan approached being completely frozen over was 1979, when extended periods of low temperatures resulted in an extensive ice buildup in the southern half of the lake (see Figure 3). In an average year, ice covers a bit less than half of Lake Michigan¹s surface. Because the lake stretches about 300 miles from North to South, there is usually much open water over the deeper waters of the southern basin due to milder temperatures. Since airborne and satellite observations of lake ice began four decades ago, only two other years, 1977 and 1994, have seen periods when nearly 90% of the lake was ice-covered. Recently, warmer temperatures have kept the ice cover far below average levels. The icepack covered only 15% of Lake Michigan in 1998, even in late February when the icepack is usually at its greatest.



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