在这些气团相遇的地方，暴风云的狭窄区域形成了，雷雨，有时是龙卷风便出现了。

Where these air masses meet, a narrow zone of storm clouds develops, and thunder storms and sometimes tornadoes occur.

youdao

根据美国国家气象局的资料，龙卷风是由雷雨云所形成，旋转速度每小时可高达600公里以上。

S. National Weather Service, tornadoes form from thunderclouds and can reach swirling speeds in excess of 600 kilometers per hour.

youdao

预计一整天的雷雨将越来越大，而大风可能是主要威胁，有可能出现单个的龙卷风。

Thunderstorms are expected to pick up in intensity throughout the day, and while high winds were likely to be the main threat, isolated twisters were possible.

youdao