Cirrus Clouds

Cirrus clouds are high-altitude clouds that are thin, wispy, and often appear feathery. They are composed mostly of ice crystals and are found at altitudes above 20,000 feet. Cirrus clouds are typically associated with fair weather but can also indicate approaching storms.

Formation of Cirrus Clouds

Cirrus clouds form when water vapor in the atmosphere condenses directly into ice crystals at high altitudes where the temperature is below freezing. These ice crystals then aggregate to form the thin, wispy structures characteristic of cirrus clouds.

Characteristics of Cirrus Clouds

• Appearance: Thin, wispy, and feathery
• Altitude: Above 20,000 feet
• Composition: Mostly ice crystals
• Indication of Weather: Typically associated with fair weather, but can also signal approaching storms

Study Guide

1. What is the composition of cirrus clouds?
2. Where are cirrus clouds typically found in the atmosphere?
3. What do cirrus clouds indicate about the weather?
4. How do cirrus clouds form?