Cirrus high wispy

Cirrus clouds are high, wispy clouds composed of ice crystals, often signaling fair weather but sometimes preceding weather changes.

About this subject

Cirrus clouds are a genus of high-altitude clouds, characterized by their wispy, filamentous appearance. They form at altitudes above 5,000 meters, often up to 12,000 meters, where temperatures are extremely low. Composed entirely of ice crystals, cirrus clouds develop when water vapor sublimates directly into ice, creating elongated structures that are carried by jet streams. Typically indicators of fair weather, they can also signify approaching warm fronts or atmospheric disturbances when present in large quantities. Meteorologists use cirrus observations for short-term weather forecasting. On a global scale, these clouds play a significant role in climate: their ice crystals reflect solar radiation and absorb infrared radiation from Earth, affecting the planet's energy balance. Optical phenomena such as halos and sun dogs can result from light refraction in the ice crystals. Cirrus clouds can also be artificially created when aircraft produce contrails that spread out, but natural cirrus clouds are far more common and widespread.

Frequently Asked Questions

At what altitude do cirrus clouds typically form?

Cirrus clouds form at high altitudes, usually between 5,000 and 12,000 meters, in the upper troposphere.

Do cirrus clouds indicate rain?

Mostly no; they are associated with fair weather. However, increasing cirrus cover can signal an approaching warm front and possible precipitation within the next hours.

Why are cirrus clouds made of ice?

Because of the extremely low temperatures at their formation altitude, water vapor freezes directly into ice crystals instead of forming liquid droplets.