Ice jams

From Glossary of Meteorology
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ice jam

  1. An accumulation of broken river ice caught in a narrow channel.

    Ice jams during freeze-up are quite porous, whereas breakup jams may comprise solid flows, frequently producing local floods during a spring breakup.

  2. Fields of lake or sea ice thawed loose from the shores in early spring and blown against the shore, sometimes exerting great pressures.