Originally sent via email October 16, 2019
The context of this post is wind shear only with regards to tropical cyclones. This isn't completely clear outside of the full email that it was original included with.
Since I've mentioned wind shear a few times I thought I'd explain it briefly. Wind shear, or more properly vertical wind shear, is when the wind changes speed and/or direction with height. Wind shear is bad for tropical cyclones for two reasons. One is that any surface low pressure system that is drawing in air needs a place for that air to go for it to grow and stay healthy. The only place that air can go is up. Tropical cyclones need an upper level feature that allows for efficient evacuation of rising air from the surface. Wind shear doesn't allow for this upper level feature to form above the surface low pressure center. Wind shear also doesn't allow the developing thunderstorms to stay close together and share heat with each other, instead it spreads them out and blows them away.
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