For Fredererick, because i enjoy being right.

"The Coriolis effect is an apparent deflection of a moving object in a rotating frame of reference. Due to the effect, cyclones rotate counterclockwise in the northern hemisphere, and clockwise in the southern hemisphere."

A popular misconception is that the Coriolis effect determines the direction in which bathtubs or toilets drain, and whether water always drains in one direction in the Northern Hemisphere, and in the other direction in the Southern Hemisphere. The Coriolis effect is a few orders of magnitude smaller than other random influences on drain direction, such as the geometry of the sink, toilet, or tub; whether it is flat or tilted; and the direction in which water was initially added to it. There is a good deal of misunderstanding on this point, as most people (including many scientists) do not realize how small the Coriolis effect is on small systems.When the water is being drawn towards the plughole, the radius with which it is spinning around it decreases, so its rate of rotation increases from the low background level to a noticeable spin in order to conserve its angular momentum

http://scienceworld.wolfram.com/physics/CoriolisForce.html