Final answer:
Cirrus clouds, characterized by their wispy curls, are high-altitude clouds made of ice crystals. They do not produce precipitation and are often associated with fair weather, but can also signal an upcoming weather front.
Step-by-step explanation:
A cirrus cloud is characterized by wispy curls. These types of clouds are high-altitude formations that typically form above 20,000 feet. The name 'cirrus' comes from a Latin word meaning 'curl', due to their distinctive wispy, feathery appearance. They are made of ice crystals, differ from other cloud types, and do not produce precipitation like rain or snow. Their occurrence is often associated with fair weather, but they can also indicate an approaching weather front.
Learn more about cirrus clouds