There was a thunderstorm here this morning.

今天早上这里有雷暴。

These are especially powerful, towering thunderstorms called supercells.

非常强大，非常激烈的雷暴，被称为超级雷暴云。

Tornadoes begin with a thunderstorm but not just any thunderstorm.

龙卷风的开始是雷暴，但是却不止是普通的雷暴。

You swap lightning bolts for thunder clouds?

你用闪电雷暴云？

Heat bursts usually start with a thunderstorm.

热浪爆发通常以雷暴开始。

Maybe it's an electrical storm or something.

也许是雷暴或其他什么原因吧。

So we need those thunderstorms to be there as sort of the seed disturbance.

需要雷暴作为种子扰动出现。

Let's say you're standing outside of your house, admiring the approaching thunderstorm.

假设你站在屋外，欣赏即将到来的雷暴。

The forecast of thunderstorms means good and bad news.

而天气预报的雷暴意味着消息好坏各半。

So big that one witness said it looked like a thunderstorm.

大到有目击者称它看起来像是一场雷暴。

As the story goes, Franklin once flew a kite in a lightning storm.

据说，富兰克林曾在雷暴天里放风筝。

And thunderstorms are shorter, smaller, and change faster than snowstorms.

雷暴比暴风雪更短，更小，变化更快。

Tornadoes are narrow storms that start in a thunderstorm and touch the ground.

龙卷风是始于雷暴并碰触到地面的小范围风暴。

No lightning. How could it be a storm?

更别说闪电了，什么都没有。怎么可能是雷暴呢？

When the airplane entered into the storm cloud, the turbulence began to get violent.

当飞机进入雷暴云层时，气流开始晃动得更猛烈了。

And when I say signals, it's things like what are those thunderstorms doing?

所说的“信号”，指的是雷暴发生的情况。

In supercells, this rising air mass is particularly strong.

在超级雷暴云中，这些上升的气团格外的强大。

Thunderstorms and gales are also expected in northern Guangxi and southeastern Jiangxi.

广西北部、江西东南部预计会伴有短时强降雨或雷暴大风。

You can find thunderstorms in different parts of the world, not just in the tropics.

你可以在世界各地发现雷暴，不仅仅是在热带地区。

All you need for a tornado really to form though are thunderstorms and a jet stream.

龙卷风形成所需要的只是雷暴雨和高速气流。