YOU SAID:
This morning it was raining rather heavily
INTO JAPANESE
私が朝起きた時、雨が降っていました。
BACK INTO ENGLISH
When I got up this morning, it was raining.
INTO JAPANESE
私が朝起きた時、雨が降っていました。
BACK INTO ENGLISH
When I got up this morning, it was raining.
That didn't even make that much sense in English.