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Mediocris Cloud Species:Moderate Vertical Growth

Learn how to identify cumulus mediocris by its moderate vertical development, with photographs, illustrations, and comparisons with related cumulus species.

Cumulus mediocris (Cu med)
Cumulus mediocris (Cu med)

Identifying the mediocriscloud species

A species of cumulus cloud of mediocre and modest height

Translated from latin meaning moderate, the ‘mediocris’ cloud species is found only in the cumulus cloud type. No other cloud type besides a cumulus cloud can be classified as mediocris. A cumulus mediocris cloud formation is fairly distinct and easy to classify in relation to other clouds: they’re a cumulus cloud that’s wide as it’s tall.

They’re halfway between cumulus humilis (wider than it is tall) and cumulus congestus (taller than it is wide). The proper cloud classification abbreviation for this cloud is ‘Cu med’. The mediocris species of cloud is common in fair weather.

They can however their vertical development and turn into a cumulus congestus cloud very quickly in unstable weather. It’s not unusual to see the cloud variety radiatus (parallel bands and strips) show itself in this cloud species. If you spot a sky full of cumulus cloud streets that contain clouds as tall as they’re wide, you might classify the clouds as cumulus mediocris radiatus.

Because cumulus mediocris are a bit more vertically developed than typical cumulus clouds, it’s possible to see them accompanied by rain (praecipitatio cloud feature), evaporating rain strips (virga cloud feature), and even a cap cloud formation (pileus cloud accessory).

Mediocris and its cloud type

Mediocris is used with the cloud type shown below. The main type identifies the broader cloud form, while this term adds a more precise classification.

Compare mediocris with related cloud species

Use the defining shape, arrangement, associated cloud type, and full sky context before selecting the most appropriate term.

Mediocris vs. humilis

Mediocris has moderate vertical growth and is about as tall as it is wide. Humilis is flatter, shallower, and wider than it is tall.

Illustration of mediocris clouds
Mediocris
Illustration of humilis clouds
Humilis

Mediocris vs. congestus

Mediocris shows moderate vertical growth. Congestus rises much higher into a pronounced tower and is clearly taller than it is wide.

Illustration of mediocris clouds
Mediocris
Illustration of congestus clouds
Congestus
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