The hardest-hit area is a swath of the Great Plains from Texas to South Dakota, known as Tornado Alley.

• 美国遭受龙卷风袭击最严重的地区是大草原的龙卷风行迹，从德克萨斯州一直延伸到南达科塔州，也就是所谓的龙卷风道。