Clear air turbulence is generated by wind shear in the jet stream.

晴空湍流是由急流中的风切变产生的。

A lot of what we call shear in the atmosphere.

大气中漂浮许多我们称之为 " 风切变" 的物体。

There is a concern about something called wind shear.

有一种叫风切变的东西令人担忧。

And if there isn't much of that, the thunderstorms can build more straight upward.

如果风切变不大，雷暴就能一路向上逐渐增强。

Now what about this shear thing?

么什么是切变呢？

Those storms want a lot of shear.

龙卷风非常需要风切变。

Less shear down here means the storms aren't going to be torn apart.

风切变减小，意味着暴风势力不会被分裂。

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。

And there's something called vertical wind shear, which is a change in wind speed or direction with height.

有一种叫做“风垂直切变”的东西，指的是风速或风向随高度的变化。

Heavy rain and flooding triggered by the shear line have been seen in many regions in the country.

菲律宾多地受切变影响造成大雨和洪水。

And so of course, the water down in the tropics is very warm, but what about this shear thing?

当然，热带的水是非常温暖的，但是风切变是什么？

Wind going in different directions and different speeds with height.

风切变是指，风流向不同的方向，在不同的高度风速也不同。

So that's the link from temperatures to winds shear to turbulence.

这就是温度、风切变和湍流之间的联系。

But these warmer conditions also affect things like where's the wind shear and how strong is it?

但是气候变暖也会影响到一些事情，比如风切变的位置和强度。

For true R.I. or rapid intensification, you need a couple things, 86 degree Fahrenheit water or greater and no shear.

对于真实的研究报告或快速加剧情况，你需要了解一些常识，华氏86度以上的水是没有风切变的。

For true RI, or rapid intensification, you need a couple things, 86 degrees Fahrenheit water or greater and no shear.

想要实现真正的“快速增强”，需要几个条件，温度在86华氏度及以上的水，没有风切变。

This usually happens away from the intense effects of the jet streams – strong wind paths that circle the planet.

通常发生在远离高空急流，即地球环流的切变影响。

Pilots use it to help with landing planes and identifying dangerous changes in wind speed and direction known as wind shear.

飞行员使用它来帮助飞机着陆，并识别风速和方向的危险变化，即风切变。

And that wind shear can cause a horizontal rotating tube of air to form.

风切变会导致形成水平旋转的空气管。

And that's really important for wind shear, which is very important for tornado formation.

这对风切变至关重要，而风切变对于龙卷风的形成极为关键。