YOU SAID:
Leaving to Atlanta before you leave and if it rains
INTO JAPANESE
出発前にアトランタに出発し、雨が降った場合
BACK INTO ENGLISH
If you leave for Atlanta before departure and it rains
INTO JAPANESE
出発前にアトランタに向けて出発し、雨が降った場合
BACK INTO ENGLISH
Depart for Atlanta before departure and if it rains
INTO JAPANESE
出発前にアトランタに向けて出発し、雨が降った場合
BACK INTO ENGLISH
Depart for Atlanta before departure and if it rains
That didn't even make that much sense in English.