4 adjectives to describe thundercloud

Implore peace, not of deified thunderclouds, but of every man, woman, or child thou shalt meet.

This Carmen Gaylor was like a beautiful, fiery thundercloud.

The weather grew hot and oppressive, and over the lowlands of Virginia there brooded a sullen thundercloud.

In the ceiling certain pink and well-fed cherubs still supported unnatural thunderclouds through which Juno forever drove her gold-wheeled car and team of patient peacocks, smiling high and goddess-like at the squalor beneath.

4 adjectives to describe  thundercloud