Cirrus clouds are a type of high-level cloud that are thin, wispy, and often resemble feathers. They typically form at altitudes of 20,000 feet (6,000 meters) or higher, and are composed mostly of ice crystals.
Cirrus clouds are often seen in fair weather and are often an indication of changing weather patterns. They form when water vapor freezes into ice crystals at high altitudes, and are typically blown along by high altitude winds.
Cirrus clouds can take on a variety of shapes and forms, from delicate, wispy strands to thick, irregular patches. They can also appear in a range of colors, from white to gray to pink or orange when illuminated by the sun during sunrise or sunset.
Although cirrus clouds are typically associated with fair weather, they can also be a precursor to storms. When they thicken and become more widespread, they can be a sign of an approaching front or other weather system.