have a fibrous or wispy appearance, resembling thin strands of hair

Among the highest clouds in the atmosphere

Cirrus clouds are often associated with fair weather or the approach of a warm front

 Stratus

Stratus clouds typically appear as a continuous layer or sheet covering the sky; grey color in the sky

Stratus clouds form at low altitudes within the troposphere

They can bring light rain or drizzle

Cumulus

Cumulus clouds have a distinct puffy or fluffy appearance, resembling cotton balls

Form in low to middle altitudes within the troposphere

Brings fair weather, especially when small and isolated

Cumulonimbus clouds

have a towering, anvil-shaped appearance with a flat top that spreads out

form at middle to high altitudes within the troposphere, extending from low levels near the Earth's surface to the upper troposphere and even into the stratosphere

Usually brings severe weather like thunderstorms, tornadoes, hail, etc.