The wind is blowing directly against the tidal stream. What does that do to the sea?
Seen from above: a yacht with a wind arrow pointing from left to right and a tidal stream arrow pointing from right to left, the two directly opposed.
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Makes the waves steeper, shorter and rougher. Wind against tide stands the waves up into a short, steep and sometimes breaking sea, worst off headlands and in harbour entrances. When the stream turns to run with the wind, the same patch of water usually becomes less steep.
