What does "banner cloud" mean?

a small, triangular cloud, extending downwind from the peak of a mountain as if a flag, or banner.

What is a synonym for "banner cloud"?

Common synonyms include: cirrus, cloudland, cocktail, cumulus, mushroom cloud, nimbus.

noun

noun ·Rare ·Advanced level

Noun

1
a small, triangular cloud, extending downwind from the peak of a mountain as if a flag, or banner.

From banner + cloud. From being a banner-like cloud that hangs off a mountain like a flapping flag.