Common cloud types

▲ Cirrocumulus

High-level, scaly-looking ripples of cloudlets. Seen in fair weather, and can prelude storms.

▲ Cirrus clouds

Short, white, whispy high-level clouds that don’t produce rain. Often occur in fine weather, but can indicate a change is on the way if seen in increasing amounts.

▲ Cirrostratus

Thin veil of cloud. Again, no rain but can indicate rain or drizzle on the way.

▲ Altocumulus

The cloudlets in rounded lumps occur in settled weather. Generally no rain, but if it forms small, castle-like turrets it can be a precursor to highlevel thunderstorms.

▲ Lenticular

A type of altocumulus cloud which forms over or downwind of hills when you have strong, stable airflow. They can sometimes indicate strong winds across the summits. They have been mistaken for UFOs!

▲ Stratocumulus

Forms in lines or waves (usually downwind of mountain ranges). Often occurs in sheets, giving overcast conditions with a lumpy texture.

▲ Cumulus

Fluffy, cauliflower-shaped clouds. Mostly indicate fair weather, often popping up on bright sunny days. Can grow into shower-producing clouds.

▲ Cumulonimbus

The king of clouds, these extend through the height of the troposphere. Often have anvil-shaped tops. Associated with extreme weather, such as storms, lightning and tornadoes.

▲ Nimbostratus

Thick, featureless blankets of dark cloud can block out the sun. Often accompanied by continuous rain or snow, they may last for several hours until the front passes over.

▲ Stratus

A blanket of grey or white. Usually dry, but can bring light drizzle or snow.