Supplication for when it thunders
سُبْـحَانَ الَّذِيْ يُسَبِّـحُ الـرَّعْدُ بِحَمْـدِهٖ، وَالْمَلَاۗئِكَـةُ مِنْ خِيْـفَتِهٖ
How perfect He is, [The One] Whom the thunder declares His perfection with His praise, as do the angels out of fear of Him.
References
[Al Mu'atta Imam Malik - 2/992]