Sign of variation A is its cup-shape. It shows low velocity and large angular velocity. Centrifugal forces decentralizing the flow.

The B variation is totaly different. In this case, the dominant of velocity is directed along the lines of flow, due to skin effect (in the sense of creating an additional vortex magnetic flux)there is pinching of the flow. Possible tornado column tilt in the direction of point 2. May be shift of the center of a tornado in the direction of point 2. This is followed by restoration of conduction flow underground. Strength decreases with displacement of the center of tornado.