slcloudburst; downpour; it rains cats and dogs; the rain is pelting down

zài guò qù de liù gè xiǎo shí qīng pén dà yǔ yī zhí chí xù bù duàn

在过去的六个小时，倾盆大雨一直持续不断。

For the past six hours, the downpour had been continuous and torrential.