Atharvavedaparishishta 65.1.6

65.1.6

dviguṇatriguṇadarśaneṣu mūlavatsu viśikhareṣu mahāvarteṣu taralarathanemighoṣeṣu udadhijalanirghoṣasaṃhrādeṣu kṣubdhadundubhininādeṣu kiñjalkāravindasaṃnibheṣu vā kumudamayūragalakālakeṣu cābhrajālāvanādeṣu chinnābhreṣu vā chinnamūleṣu kāleṣu kāñcanamanahśiloupameṣu suvarṇapūrṇeṣu jaleṣv asmin na cābhyantarato deśaśobhiteṣu dakṣiṇamāruteritaparitate grahāntargatastanitagambhīranisvaneṣu ardhāntareṣu sadyovarṣam ādiśet || atra ślokau ||

When [clouds] are seen doubled or tripled, rooted, having high peaks, with great whirls, making sounds like trembling chariot-fellies, reverberating with the roar of ocean waters, booming like agitated kettledrums, or resembling lotus-filaments; or dark like white lotuses or peacock necks, resounding with masses of clouds; or when there are broken clouds, or clouds broken at the base; at times resembling gold or realgar, filled with golden [hues], in these waters and adorned within by [various] places; stirred and spread by the south wind, sounding with deep thundering within the planets; [or] in the middle of half [the sky], one should predict immediate rain. On this there are two verses: