道格拉斯县已经更新了龙卷风警报。
The tornado watch has been updated to a tornado warning for residents in Douglas County.
美国预报员平均能提前13分钟发出龙卷风警报。
Forecasters in the United States can give an average warning time of 13 minutes before a tornado hits.
星期一阿拉巴马州发布罕见的冬季龙卷风警报。
Rare winter tornado warnings were issued in Alabama on Monday.
因此，若已提出龙卷风警报，那表示一个龙卷风已在某处。
So if there's a tornado warning on, it means a tornado is out there somewhere.
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”。
ELIZA: Yes. If a tornado has been spotted, they announce a "tornado warning".
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。
ELIZA: There is a tornado warning on. My mother just told me she heard it on the radio.
而显然的是，警报汽笛在龙卷风来袭三个小时之前就已拉响。
Warning sirens apparently went off three hours before the twister hit the building.
而显然的是，警报汽笛在龙卷风来袭三个小时之前就已拉响。
Warning sirens apparently went off three hours before the twister hit the building.
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