Describing a cloud formation that combines the wispy characteristics of cirrus clouds with the accumulating or heap-like qualities of cumulus clouds.
From cirro- (cirrus) + cumul- (heap) + -ative (adjective suffix). A rare technical term emphasizing the accumulation aspect of the mixed cloud type.
These cloud patterns often signal the approach of a warm front, which is why sailors historically learned to fear the 'mackerel sky' as a warning of coming weather!
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