Upon hearing thunder

Subḥāna ‘l-ladhī yusabbiḥur-ra`du bi ḥamdihi wa ‘l-malā'ikatu min khīfatih. Glory is to Him Whom thunder and angels glorify due to fear of Him. Reference: Whenever Abdullah bin Zubair (RA) would hear thunder, he would abandon all conversation and say this supplication. See Al-Muwatta' 2/992. It was graded authentic by Al-Albani as a statement of Abdullah bin Zubayr only.