Traverse City Record-Eagle

Archive: Friday

December 13, 2013

Chill may stabilize levels in big lake

TRAVERSE CITY — Arctic winds swept across the country this week, and numbed the Grand Traverse region with near-zero degree wind chill as a steady stream of snow flurries whipped off the bays and Lake Michigan.

Lake-effect snow has been northern Michigan’s frequent companion for a month, and cold air chilled Lake Michigan waters to between 41 and 42 degrees Fahrenheit, two degrees below this time last year.

The temperature marks a return to long-term averages, and most closely matches those of 2008, said National Oceanic and Atmospheric Administration experts.

It’s too early to predict with certainty, but bay watchers are hopeful the early cold winter will allow Grand Traverse Bay to freeze over, an event that hasn’t occurred since March 2009.

“You can’t forecast ice coverage; it’s more of an observed thing,” said Keith Berger, a meteorologist at the National Weather Service in Gaylord. “This wind knocks the freezing back down again. You might get (ice) on the top, but then along goes a wave and it brings up 40 degree water and ice is gone.”

A frozen lake can mean less evaporation, higher lake levels and less lake-effect snow later in the winter, although experts say the Grand Traverse Bay is considered frozen when ice reaches to Power Island, an event that usually doesn’t occur until late February or early March.

“I think it’s a good indication that our ecosystem, our lake ecosystem, is nice and healthy and working the way it should,” Christine Crissman, executive director for the Watershed Center Grand Traverse Bay. “It’s going to be a positive thing for our water levels.”

Last year, lake levels hit record lows in December and January. Scientists predict lake levels will be around a foot higher than last year for the next six months, but still about 16 inches below long-term averages.

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