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HORIZONTAL VORTICITY- A rotation of air caused by vertical speed or directional wind shear.
sides of the pseudo-warm front rush westward into the mesocyclone, there is a tendency for the north side cool air to slide beneath the warm air, which, in turn, rotates above the cool air. This "solenoidal" generation of horizontal vorticity and ...
 See also: Clear, Period, Air, Storm, Meteor
  
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