Residents were warned to take shelter as a tornado approached the town.

tornado 是名词，指"龙卷风"，这是一种强烈的、旋转的气旋风暴，通常呈漏斗状云柱从雷暴云延伸至地面，具有极强的破坏力。这个词源自西班牙语"tronada"(意为雷暴)，后演变为现在的形式。