
In forestry, windthrow refers to trees uprooted or broken by wind. Breakage of the tree bole (trunk) instead of uprooting is sometimes called windsnap. == Causes == Windthrow is common in all forested parts of the world that experience storms or high wind speeds. The risk of windthrow to a tree is related to the tree`s size (height and diameter),....
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http://en.wikipedia.org/wiki/Windthrow

the blowing over of trees by the wind
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http://phrontistery.info/w.html

A tree or trees uprooted or felled by the wind.
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http://www.encyclo.co.uk/local/21804

a tree felled by wind. Windthrows, also known as blowdowns, are common among shallow-rooted species and in areas where cutting has reduced stand density.
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https://www.encyclo.co.uk/local/22458
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