Wind Power
 

Flagging — the effect of strong winds on area vegetation—can help determine area wind speeds. Trees, especially conifers or evergreens, can be permanently deformed by strong winds. The Griggs-Putnam Index of Deformity is an additional useful tool to help determine the potential of a wind site. Observe the area’s vegetation. The shape, especially conifers or evergreens, is often influenced by winds. Strong winds can permanently deform (flag) the trees. Flagging is usually more pronounced for single, isolated trees with some height.