On velocity images, Northern Hemisphere tropical cyclones have a pattern that shows both their counterclockwise rotation and the speed maximum at low levels.Here, we see that the radial velocity shows a symmetric pattern of counterclockwise flow, with the maximum wind speeds coinciding with the location of the eyewall. In the Northern Hemisphere, the velocities are slightly faster on the right-hand side with respect to the system's motion vector. This is because a tropical cyclone's forward motion and rotational motion are in the same direction on this side and add together. On the left-hand side, the rotational motion and forward motion are in opposing directions, resulting in lower speeds on that side.
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