My experience is 30 foot anemometer can't show true wind speeds that topple trees.
Taller trees are more susceptible to a problem known as “windthrow” than their shorter counterparts. Windthrow refers to the act of strong winds fully uprooting trees. A tall trunk combined with full foliage turns your tree into a lever.
Thus, when strong winds hit the upper part of the tree while exerting a considerable force on the lower trunk and roots, it can remove the entire root system off the ground, even if it is a large tree with healthy roots.
Trees with Two Trunks
Other trees most likely to fall in the wind are those with multiple trunks. A standard tree structure has one dominant trunk. If your tree has more than one dominant lead, it is more likely to suffer storm damage as the trunks offer blow away and towards each other.