当夜，空袭警报拉响了数次，但并没有飞机来袭。

There were several alarms during the night but no actual air raid took place.

youdao

上帝啊，看来今天晚上我睡不成了，我刚刚听到持续的警报声，我们正奉命进入基地要塞，因为有一些迫击炮弹来袭。

Oh my God, looks like I won't be sleeping tonight as well, as I just heard the siren go on, and we are being instructed to go into the fortified bases because there are some mortars coming our way.

youdao

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.

youdao