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Windthrow Impacts

Example of HA types. Show Larger Image
Example of Impact in Hemlock–Amabilis Types

In moist/cool areas, wind has a major influence on stand structure and the distribution of stands across the landscape.

HA (hemlock–amabilis) and CH (cedar–hemlock) are two well known coastal types. HA stands have a history of windthrow. Some stands have historically been repeatedly blown down. CH stands lose individual trees while veteran redcedar is very windfirm.

HA types are predisposed to windthrow because of high density and uniformity; also due to frequency of trees growing on rootwads/logs. Stands become more unstable as they grow taller, eventually failing.

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