Essentially, the ice travels through the same mechanism as an iceberg. While strong ocean currents allow icebergs to move through the water, strong winds can allow ice to overcome the friction of the land and begin to move. Witnesses have compared the sound of an ice shove to that of a train, thunder, and the sound of countless windows all breaking at once. The resulting ice movement is known to cause damage to the houses and trees closest to the body of water. In northern areas, including Canada, warnings of ice pileups are often given alongside flood warnings during the winter months.