Large branches bend on the trees, and the trunks sway; inconvenience felt when walking against the wind.
At Sea:
Strong waves are piling up on the sea; Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind.
On land:
On trees, thin and dry branches break, and large trunks sway; generally impedes progress.
At Sea:
The sea is very strong moderately high long waves; edges of crests begin to break into spindrift. The foam is blown in well-marked streaks along the direction of the wind.