‘Winds swept the sky like giant brooms piling up clouds before them, clouds which writhed into different shapes, melted into rain or darkened, bruised themselves against an unseen antagonist and went on their way.’
From The Changeover (1984), a novel by Margaret Mahy.
An arcus cloud feature, also known as a shelf cloud, at the leading edge of a Cumulonimbus storm cloud spotted over George Washington Bridge, Washington Heights, on the border of New York and New Jersey, US by Lin-Manuel Miranda (Member 49,908).