High pressure would cause the tidal range to .

Tidal range is the height difference between high tide and low tide. Tides are the rise and fall of sea levels caused by gravitational forces exerted by the Moon and Sun and the rotation of Earth. Tidal range is not constant but changes depending on the locations of the Moon and Sun.

Air pressure has a direct influence on the sea level. High air pressure exerts a force on the surroundings and results in water movement. So high air pressure over a sea area corresponds to low sea level and conversely low air pressure (a depression) results in higher sea levels.

Or I have no idea :/

Cotton was the very first