An ice shove is a rapid push of free-floating lake or sea ice onshore by wind. Strong winds from the same direction over, say, a 12 to 24 hour period, are enough to drive large chunks and plates of ice ashore.The initial slabs or blocks of ice will slow down momentarily when reaching land, creating a traffic jam of ice piling behind and on top. The result is a massive ice pile often over 10 feet high, surging ashore in a matter of minutes, surrounding and damaging everything in their path, including trees, sod, fences, and
homes.
In some parts of the Great Lakes, Upper Midwest and Canada, ice shoves are common in the spring as lake ice breaks up, floats, then push ashore. April and May are considered ice shove season along Wisconsin's Lake Winnebago shore.
April also provided for record ice coverage. Due to lower than average temperatures and record ice cover, it is not unusual that we have ice cover still happening. Temperatures have not risen enough to melt all ice cover.
http://www.weather.com/news/weather-winter/ice-shove-menominee-michigan-lake-winnebago-wisconsin-20140416
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