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  • Environment Canada's definition
    "Large, thick, uneven and discoloured ice floes that form on the upstream side of shoals and islets in rivers when cold weather precedes or accompanies neap tides. Composed of ice of different thicknesses formed under pressure during ebb tide, the whole mass freezing together and gradually increasing in size with each successive tide. As the range increases between the neap and spring tides, large sections of grounded ice break away and drift down river. This is a Canadian description and not part of the WMO nomenclature."
    http://www.ec.gc.ca/glaces-ice/default.asp?lang=En&n=05F5AE4E-1&wsdoc=5947C613-E298-4067-A834-CFA298553762


    January 24, 2013