Matsya Purana — Narasimha’s Victory over Hiraṇyakaśipu and the Catalogue of Apocalyptic Omens
जीमूतघनसंकाशो जीमूतघननिःस्वनः जीमूतघननिर्घोषो जीमूत इव वेगवान् //
jīmūtaghanasaṃkāśo jīmūtaghananiḥsvanaḥ jīmūtaghananirghoṣo jīmūta iva vegavān //
He looked like a dense mass of rain-clouds; his sound was like the rumbling of heavy clouds; his roar was like the crash of storm-clouds—swift and forceful, like a cloud driven by the wind.
It uses storm-cloud imagery—rumble, roar, and speed—to evoke overwhelming cosmic power, a common Purāṇic mood for Pralaya-adjacent scenes even when the verse itself is primarily descriptive.
Indirectly, it models Purāṇic ideals of majesty and controlled power: a king is urged elsewhere in the Matsya Purana to be formidable in protecting dharma, yet disciplined—like a force of nature that moves with purpose.
No direct Vāstu or ritual instruction appears; however, this kind of standardized cloud-simile is part of Purāṇic iconographic description (pratimā-lakṣaṇa style language) used to convey awe and auspicious potency.