CLOUDS

Name

Form

Height

Stratus

Grey cloud layer

Sea level to 1,500 feet

Cumulus

Sharp outline and dense in rising mounds

1,500 to 6,500 feet

Cumulonimbus

Heavy, dense and rising a considerable distance

1,500 to 6,500 feet

Stratocumulus

Sheets of grey with white patches

1,500 to 6,500 feet

Nimbostratus

Dark grey layer with rain or snow

3,000 to 10,000 feet

Altocumulus

Sheets of white or grey

6,500 to 23,000 feet

Altostratus

Grey/blue ribboned sheets covering whole sky

6,500 to 23,000 feet

Cirrus

White filaments

16,500 to 45,000 feet

Cirrocumulus

Thin white sheet

16,500 to 45,000 feet

Cirrostratus

Thin, transparent white sheet

16,500 to 45,000 feet