Many ancient peoples have legends about massive floods. The second is "fire calamity," which was World War II. The third is "wind calamity," like the "winds blowing in high places" as described in Daoist texts. Something similar to this would be the extremely hot wind created by a nuclear bomb.
所謂第一劫是「水劫」，就是許多古老民族都有的大洪水傳說；第二劫是「火劫」，就是第二次世界大戰；至於第三劫，是「風劫」，是一種罡風，類似核子彈爆炸產生的極高熱度的風。