سُبْحَانَ الَّذِيْ يُسَبِّحُ الرَّعْدُ بِحَمْدِهِ وَالْمَلَائِكَةُ مِنْ خِيْفَتِهِ
Glory is to Him Whom thunder and angels glorify due to fear of Him.
Subhaanal-lathee yusabbihur-ra'du bihamdihi walmalaa'ikatu min kheefatihi.
Whenever Abdullah bin Zubair (RA) would hear thunder, he would abandon all conversation and say this supplication.