Dua when hearing thunder
سُبْحـانَ الَّذي يُسَبِّـحُ الرَّعْـدُ بِحَمْـدِهِ وَالمَلائِكَـةُ...
سُبْحـانَ الَّذي يُسَبِّـحُ الرَّعْـدُ بِحَمْـدِهِ وَالمَلائِكَـةُ مِنْ خيفَتِـه
Subhanal-lathee yusabbihur-raAAdu bihamdihi walmalaa-ikatu min kheefatih
Translation
How perfect He is, (the One) Whom the thunder glorifies and praises, and so do the angels, out of awe of Him.
When to recite
Recited when hearing thunder.
Source / Reference
Al-Muwatta 2/992