Seasonal Outlook for the Great Lakes - Winter 2011-2012

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This outlook of the expected pattern, timing, and the extent of ice growth has been developed through an analysis of the oceanographic and meteorological parameters for the summer and the fall before the beginning of the ice season. These conditions are compared with earlier years then further analysed using the December wind and temperature forecasts plus the seasonal temperature outlook.  Significant variations from these wind and temperature conditions will have an impact on the timing and extent of ice formation.

Throughout the winter, this outlook will be updated by a twice monthly issue of the 30-day forecasts.  These forecasts will also indicate the beginning of the spring break-up process. 

Mariners planning operations in waters impacted by hazardous ice conditions may obtain more details regarding ice conditions by consulting the CIS website at http://www.ec.gc.ca/glaces-ice/, or by contacting their regional Marine Communications and Traffic Services (MCTS) centre (http://www.ccg-gcc.gc.ca/eng/Ccg/mcts_Home).