Sushruta Samhita
प्रावृष्यम्बरमानद्धं पश्चिमानिलकर्षितैः । अम्बुदैर्विद्युदुद्द्योतप्रस्रुतैस्तुमुलस्वनैः ॥३१॥
In the rainy season, the sky is covered with clouds, and the western winds are carried away. The clouds, illuminated by lightning, create a tumultuous sound.
english translation
prAvRSyambaramAnaddhaM pazcimAnilakarSitaiH । ambudairvidyududdyotaprasrutaistumulasvanaiH ॥31॥
hk transliteration by Sanscript