What are Alto Clouds?
Alto clouds are mid-level clouds found in the troposphere, typically between 6,000 and 20,000 feet (1,800 and 6,100 meters) above ground level. They are characterized by their layered or patchy appearance, often appearing as small, rounded clumps or rolls. While mostly composed of water droplets, they can also contain ice crystals. Precipitation from alto clouds is uncommon.
The most common type of alto cloud is altocumulus. According to the Met Office, altocumulus clouds are "mostly found in settled weather". These clouds are described as:
- Small, mid-level layers or patches: Often appearing as rounded clumps or cloudlets.
- Globular masses or rolls: They can exist in a variety of shapes and formations.
- Varied appearance: While generally appearing in clumps or heaps, their exact shape varies considerably.
- Rare precipitation: Rainfall from altocumulus clouds is infrequent.
The term "alto" in "altocumulus" (and "altostratus") signifies mid-level, even though the Latin translation means "high." This is used to distinguish them from similar high-level clouds.
Some examples of beautiful altocumulus cloud formations include those seen in lenticular clouds formations, often visually striking and dramatic.
Formation and Composition
Altocumulus clouds form due to atmospheric processes, though the specific mechanics aren't covered in the provided references. They are primarily composed of water droplets, but ice crystals may also be present, especially at higher altitudes within their range.
