“下暴雨”用英语怎么说？

当时正在下暴雨.It was pouring down.由于下暴雨,他迟到了.He was late as a result of the heavy rain.堰塞湖, 加之下暴雨, 山体滑坡的泥石流.Imprisoned lake, under Canada rainstorm, mountain massif landslide mud - rock flow....