Tropical Cyclone Bongani dissipated today, November 26, in the Mozambique Channel as a result of wind shear. Wind shear is a difference in wind speed and direction over a relatively short distance in the atmosphere. Wind shear can be both vertical and horizontal. Horizontal wind shear is seen across front, while vertical wind shear can be near the Earth’s surface or higher levels in the atmosphere near upper level jet streams. Wind shear can tear storms apart. If you think of a tropical cyclone as a haystack, and you direct giant fans blowing at different heights of the stack, going different ways, that’s similar to how wind shear affects a tropical cyclone. It pushes into its circulation, weakening it. |
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