YOU SAID:
When it rains in pours
INTO JAPANESE
土砂降りの雨が降ったとき
BACK INTO ENGLISH
When it rained heavily
INTO JAPANESE
激しい雨が降ったとき
BACK INTO ENGLISH
when it rains heavily
INTO JAPANESE
激しい雨が降ったとき
BACK INTO ENGLISH
when it rains heavily
Come on, you can do better than that.