Brihat Samhita
माञ्जिष्टाभाः शस्त्राग्निसम्भ्रमं बभ्रवः पवनवृष्टिम् । भस्मसदृशास्त्ववृष्टिं तनुभावं शबलकल्माषाः ॥ ३०-१४ ॥
Madder-red clouds cause panic due to weapons and fire; brown-coloured ones bring wind and rain. Ash-like clouds result in drought, while mottled and dark-spotted ones indicate thin or scanty rain.
english translation
mAJjiSTAbhAH zastrAgnisambhramaM babhravaH pavanavRSTim । bhasmasadRzAstvavRSTiM tanubhAvaM zabalakalmASAH ॥ 30-14 ॥
hk transliteration by Sanscript