YOU SAID:

the thunder crashes loudly while the rain pours down

INTO JAPANESE

雨が降っている間、雷は大音量でクラッシュします

BACK INTO ENGLISH

Lightning crashes at high volume while it is raining

INTO JAPANESE

雨が降っている間、雷が大音量でクラッシュする

BACK INTO ENGLISH

Lightning crashes during a rain

INTO JAPANESE

雨の中に雷がクラッシュ

BACK INTO ENGLISH

Lightning crashes in the rain

INTO JAPANESE

雨の中で雷がクラッシュ

BACK INTO ENGLISH

Lightning crashes in the rain