24-hour Atmospheric Shear Tendency
The change in deep-layer wind shear
over 24 four hours is plotted with the line contours. An increase in
shear is shown as a positive value (solid lines), a decrease is negative
(dashed lines). The current upper level shear is shown with the colored
The presence/lack of atmospheric wind shear is vital to
hindering/supporting TC development.
Movement of a TC towards regions of weakening/increasing shear is
preferential/detrimental to TC growth or development.
For more AMV information, please visit the
International Winds Working Group (IWWG)