Low-level clouds (0-2 km)

Stratus, Cumulus, Cumulonimbus and Stratocumulus

This type of cloud is always made of ice crystals whose degree of separation determines how transparent the cirrus is. Besides the filament appearance, cirrus clouds stand out among other types of cloud because they’re often colored in bright yellow or red before sunrise and after sunset, respectively. Cirrus clouds lit up long before other clouds and fade out much later.