Bhagavatapurana 12.4.13

12.4.13

śataṃ varṣāṇi varṣanti nadanti rabhasa-svanaiḥ /
tata ekodakaṃ viśvaṃ brahmāṇḍa-vivarāntaram //

12. & 13. The sky remains hazy covered with dust; then for a century hosts of clouds, in various forms, pour down showers and peal thunders of terrible noise; thereupon the whole Universe is one sheet of water throughout the space within the egg of the Universe.