Great Lakes products are created in cooperation with U.S. National Ice Center and Canadian Ice Service under the North American Ice Service (NAIS). Ice charts and support files are based off the daily ice analysis of the Great Lakes. NAIS also produces 30 day outlooks twice a month along with an annual outlook and end of season summary.
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.
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
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:
View Chart
ConcentrationDownload PNG
Concentration Thickness Combo Four Panel Archive