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A patterned mid-level layer of rounded cloudlets.
Also known as: Mid-level cloud symbol, Mackerel sky
Altocumulus is a mid-level sheet broken into rounded elements. When it appears as small turrets on a summer morning it is a recognised signal of instability aloft and often precedes thunderstorms later in the day.
Denotes altocumulus: a mid-level layer broken into rounded or rolled elements.
Contexts: Navigation, Maps
In its turreted form indicates instability at height and is a recognised precursor of afternoon thunderstorms.
Contexts: Navigation, Maps
A row of small rounded shapes drawn side by side in a horizontal band, sometimes with a small line beneath.