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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.

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Ice Charts Data Files Periodic Trend Graph Trivariate Synopsis
Ice Charts Data Files Icebergs Ross Outlook Trend Graph Trivariate Synopsis
Ice Charts Data Files Outlooks
Ice Chart Data Files Outlooks
Snow and Ice Charts Data Files
Area
Description
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Thumbnail image of current daily eastern Great Lakes chart
Great Lakes Concentration Ice Charts

Daily ice chart that represents current ice concentration for eastern/western Great Lakes waters during their ice season. Ice concentration is shown in color. Additionally, WMO egg code represents ice concentration, ice stage of development with its concentration, and ice floe size. Ice charts are presented in color GIFs.

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East West

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East West
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Thumbnail image of current daily eastern Great Lakes chart
Great Lakes B/W Ice Charts

Daily ice chart that represents current ice coverage for eastern/western Great Lakes waters during their ice season. WMO egg code represents ice concentration, ice stage of development with its concentration, and ice floe size. Ice charts are presented in black and white GIFs.

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East West

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East West
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Thumbnail image of current daily eastern Great Lakes chart
Great Lakes Stage of Development Ice Charts

Daily ice chart that represents current ice stage of development for eastern/western Great Lakes waters during their ice season. Ice stage of development is shown in color. Additionally, WMO egg code represents ice concentration, ice stage of development with its concentration, and ice floe size. Ice charts are presented in color GIFs.

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East West

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East West
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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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Concentration
Thickness
Combo Four Panel

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Concentration Thickness Combo Four Panel
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