Wind near bodies of water is
primarily a thermal event (closely related
this answer ).
Water has a very
high heat capacity (i.e., it takes a lot of
to make it change temperature), higher than the
adjacent land. This means that the land heats up
faster than the water, and the air above the land
heats up faster than the air above the water. The
density of the air above the land decreases as it
warms, so it rises and the cooler air above the
water moves in (i.e., the wind blows from the
water to the land). At night, the land cools
faster than the water and the wind blows in the
Winds can also be stronger near the shore
the ocean doesn't have anything to block the
movement of the air like the trees, buildings,
etc.,that exist on land.
The sea is mostly flat, with the result that there
is nothing to stop the wind. It is windy on
mountain tops for the same reason. Valleys are
less windy because the surrounding mountains stop
wind, and forests are really less windy because
trees stop wind.
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