Brihat Samhita
वर्षत्यपि रटति यदा गोमायुश्च प्रदोषवेलायाम् । सप्ताहं दुर्दिनं अपि तदा पयो नात्र सन्देहः ॥ २८-२४ ॥
When, even while it is raining, the jackal howls at twilight, then there will be rain and overcast weather for a whole week—there is no doubt about it.
english translation
varSatyapi raTati yadA gomAyuzca pradoSavelAyAm । saptAhaM durdinaM api tadA payo nAtra sandehaH ॥ 28-24 ॥
hk transliteration by Sanscript