Brihat Samhita
पवनः पवनाभिहतो गगनादवनौ यदा समापतति । भवति तदा निर्घातः स च पापो दीप्तविहगरुतः ॥ ३९-०१ ॥
When two winds come in collision, that which, being struck, falls on the Earth is known as thunderbolt; if at the time birds should begin to sound turning to the Sun there will be misery on Earth.
english translation
pavanaH pavanAbhihato gaganAdavanau yadA samApatati । bhavati tadA nirghAtaH sa ca pApo dIptavihagarutaH ॥ 39-01 ॥
hk transliteration by Sanscript