Those storms want a lot of shear. Wind going in different directions and different speeds with height.
龙卷风雷雨需要大量的风切变。风切变指，风吹向不同的方向，风速随高度而变化。
Shear wind
原声例句
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We hear about it in tornadic thunderstorms. Those storms want a lot of shear, wind blowing in different directions and different speeds with height.
我们在龙卷风的雷暴中听说过。这些风暴想要很多很多的切变，在一定高度上风会在不同方向以不同速度吹开。
英语百科
Wind gradient
（重定向自Shear wind）
In common usage, wind gradient, more specifically wind speed gradient or wind velocity gradient, or alternatively shear wind, is the vertical gradient of the mean horizontal wind speed in the lower atmosphere. It is the rate of increase of wind strength with unit increase in height above ground level. In metric units, it is often measured in units of meters per second of speed, per kilometer of height (m/s/km), which reduces to the standard unit of shear rate, inverse seconds (s).
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