cloud bank

noun

noun

A wall of clouds, rising above horizon or observed from a distance, but not overhead.

The hills were slate under the stacks of black cloudbank.1977, John Le Carré, The Honourable Schoolboy, Folio Society, published 2010, page 6:
"Then he wrote: “Sunset threatening, with a low bank of clouds to N. and E. Sky clear overhead.”"1919, Joseph Conrad, Typhoon:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.