Srimad-Bhagavatam: Canto 8 - Chapter 1 - Verse 49
Sanskrit:
ततो महाघना व्योम्नि गम्भीरपरुषस्वना: ।अङ्गारान्मुमुचुर्वातैराहता: स्तनयित्नव: ॥ ४९ ॥
ITRANS:
tato mahā-ghanā vyomnigambhīra-paruṣa-svanāḥaṅgārān mumucur vātairāhatāḥ stanayitnavaḥ
Translation:
Fierce clouds, harassed by strong winds, then appeared in the sky. Rumbling very gravely with the sound of thunder, they began to shower live coals.