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Atmospheric Vorticity
Background:
Using the gridded atmospheric
motion vector output u and v AMV components at the specified
level, vorticity is computed using finite differencing of
(dv/dx - du/dy), where u and v are the wind components
and x and y are the horizontal grid spacing. Units are 10-6s-1.
Uses:
Vorticity is a measure of curvature in atmospheric flow. A
positive value indicates counter clockwise motion in the northern
hemisphere and clockwise motion in the southern hemisphere.
A positive vorticity environment is conducive to storm development.
For more AMV information, please visit the
International Winds Working Group (IWWG)
page.
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