Great Lakes Water LevelsOctober 25th, 2013 at 9:26 am by Bill Steffen under Bill's Blog, Weather
Click on the picture to enlarge. These are lake-effect snow/sleet showers coming off of Lake Michigan (pic. from UpNorthLive.com and NBC Traverse City). The water level of Lakes Superior, Michigan and Huron all dropped an inch in the last month. Lake Erie fell 5″ in the last month and Lake Ontario was down 4″. All of the Great Lakes are significantly higher than one year ago. Lakes Michigan, Huron and Erie are all 9″ higher than one year ago, Lake Superior is up an even foot and Lake Ontario is 13″ higher year-to-year. Lake Superior remains 2″ below their century average. Lake Erie is down one inch and Lake Ontario is up one inch from the long-term average. Lake Michigan/Huron is 17″ below the century average. Of course, lake-effect precipitation does not increase lake levels. If anything an overall dry and cool pattern will lower lake levels, though the pattern we are in with lots of clouds and relatively high humidity will lower evaporation rates.