ELIZA: Yes. If a tornado has been spotted, they announce a "tornado warning".

艾丽沙：是的，如果龙卷风已经被监测到，他们就会宣布“龙卷风警报”。

youdao

So if there's a tornado warning on, it means a tornado is out there somewhere.

因此，若已提出龙卷风警报，那表示一个龙卷风已在某处。

youdao

ELIZA: There is a tornado warning on. My mother just told me she heard it on the radio.

艾丽沙：有一个龙卷风的警报，我妈刚刚告诉我她从收音机听到的。

youdao

A tornado warning means that a tornado has been seen.

VOA: special.2010.05.11

Usually a community will receive a warning at least a few minutes before a tornado strikes.

VOA: special.2010.05.11

So until then, when you hear the tornado sirens or tornado warning, take cover immediately.

CNN: The making of a nightmare tornado

Another band moved east from the Chicago area through Ohio, at one point prompting a tornado warning.

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They turned out to be so severe that a tornado warning was issued.

NPR: Monday Blues: Bay Hill Pushed Back By Thunderstorm