Alto cirrus is not a recognized or formal classification of cloud types. The reference material states that clouds with the prefix "alto-" are mid-level clouds found between 2,000 and 6,100 meters (6,500 to 20,000 ft). Cirrus clouds, on the other hand, are high-altitude clouds. Therefore, an "alto cirrus" cloud is not a valid type. The reference material does mention that cirrocumulus and cirrostratus are sometimes informally referred to as cirriform clouds due to their association with cirrus, but they are not mid-level clouds. The term "alto" specifically indicates mid-level.
However, the question might be trying to understand the relationship between mid-level and high-level clouds. Here’s a breakdown of how these terms are used in cloud classification:
| Cloud Category | Altitude Range | Description |
|---|---|---|
| High-Level | Above 6,100 meters (20,000 ft) | Includes cirrus, cirrocumulus, and cirrostratus clouds. These are typically wispy and made of ice crystals. |
| Mid-Level | 2,000 to 6,100 meters (6,500 to 20,000 ft) | Clouds with the prefix "alto-," like altocumulus and altostratus. These are typically composed of water droplets or ice crystals. |
| Low-Level | Surface to 2,000 meters (6,500 ft) | Includes stratus, stratocumulus, and nimbostratus clouds. Generally made of water droplets. |
Therefore, if you encounter a cloud that seems to blend characteristics of both cirrus and mid-level clouds (like alto clouds), it would most likely be classified as either:
- Cirrostratus or Cirrocumulus: If the clouds are high enough and are still showing cirrus characteristics.
- Altostratus or Altocumulus: If it is within the mid-level range as noted by the "alto-" prefix
In conclusion, while the term "alto cirrus" is not used, it's important to understand the differences between mid and high-level clouds.
