﴿ هُوَ ٱلَّذِى يُرِيكُمُ ٱلْبَرْقَ خَوْفًۭا وَطَمَعًۭا وَيُنشِئُ ٱلسَّحَابَ ٱلثِّقَالَ ﴾

“HE IT IS who displays before you the lightning, to give rise to [both] fear and hope, and calls heavy clouds into being;”

Please check ayah 13:13 for complete tafsir.