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A heaped cloud drawn with a spreading anvil top.
Also known as: Anvil cloud symbol, Thundercloud marking
Cumulonimbus is drawn with a flattened, spreading top: the anvil formed where the rising column meets the tropopause and can go no higher. It is the only cloud genus that produces thunder, hail and tornadoes.
Denotes cumulonimbus, the deep convective cloud whose top spreads into an anvil at the tropopause.
Contexts: Navigation, Maps
Is the only genus producing thunderstorms, hail and tornadoes, which is why its identification matters more than that of any other cloud.
Contexts: Navigation, Maps
A heaped rounded outline whose upper part flattens and spreads sideways into a broad horizontal shape.