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Section 5.4 Other forces
The centrifugal force is caused by centripetal acceleration (toward the center of the rotation); for wind the centrifugal force points outward from the center of rotation (that is, it is the tendency of wind to want to travel in a straight line)
where is positive for cyclonic flow and negative for anticyclonic flow: works against PGF around lows and with PGF around highs; this force also gets very strong for small turning radii.
Friction with the surface will decelerate the wind; this force thus always moves in the direction opposite the wind. It is described by
where is the wind speed and describes the roughness of the surface. Trees and tall buildings have much more "roughness" whereas sand/snow/water have very low roughness.