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Great Lakes Ice Charts

Great Lakes ice charts are produced off the daily Great Lakes ice analysis in cooperation with the U.S. National Ice Center (USNIC) and Canadian Ice Center. The charts are separated into eastern and western portion of the Great Lakes and available in color and black/white. USNIC also produces periodic ice charts for U.S. Coast Guard District 9 support broken into ice concentration, ice thickness/type, and a combination of both.

Area
Description
Display / Format

Thumbnail image 
                 of current daily western Great Lakes chart
Western Great Lakes

Daily ice chart that represents current ice conditions for western Great Lakes waters during their ice season. Ice coverage is detailed by total ice concentration, ice type with its concentration, and ice floe size, which are represented within the WMO egg code. Ice charts are presented in color and black / white GIFs.

View Chart

Color
B/W

Download GIF

Color B/W
Archive

Thumbnail image 
                 of current daily eastern Great Lakes chart
Eastern Great Lakes

Daily ice chart that represents current ice conditons for eastern Great Lakes waters during their ice season. Ice coverage is detailed by total ice concentration, ice type with its concentration, and ice floe size, which are represented within the WMO egg code. Ice charts are presented in color and black / white GIFs

View Chart

Color
B/W

Download GIF

Color B/W
Archive

Thumbnail image 
                 of current U.S. Coast Guard District 9 support chart
United States Coast Guard District 9 Ice Charts

Twice weekly (Tuesday and Thursday) ice charts that represents the current ice conditons for Great Lakes waters during their ice season. Ice coverage is detailed in 3 separate charts:

  • Ice Concentration - color coded ice conditions based on concentration values in tenths.
  • Ice Thickness - color coded ice conditions based on thickness values in inches.
  • Ice Combination Chart - combined color and texture ice conditions based on both concentration and thickness.
  • Four Panel Chart - all charts along with previous year Combination chart arranged in four panels.
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