Cirrus clouds are high-altitude clouds and are composed of tiny ice crystals. They appear wispy and can stretch across the sky for miles. These are formed by the presence of tiny particles known as ice nuclei, water vapor in the atmosphere condenses onto these nuclei, forming tiny ice crystals. As these ice crystals grow and accumulate, they become the building blocks of Cirrus clouds. Wind patterns at high altitudes also play a crucial role in shaping the characteristic feathery appearance of Cirrus clouds. These can be seen all year and often preced a weather system's arrival, such as an approaching warm or cold front.