Common Cloud Types

High Clouds;

Cirrus (Ci), 20 - 40,000

- "Mares' tails"

- Bad weather coming

Cirrostratus (Cs), 20, 000

- Showers or rain soon

Cirrocumulus (Cc), 18 - 20, 000

- "Mackerel skies"

- Unsettled weather


Middle Clouds;

Altostratus (As), 15 - 20, 000

- Rain likely

Altocumulus (Ac), 10, 000

- Sunny periods


Low Clouds;

Stratus (St), 100 - 300

- Drizzle coming

Stratocumulus (Sc), 1,500 - 6,500

- Dry but dull weather

Nimbostratus (Ns), 100 - 3, 000

- Rain imminent


Vertically Developing Clouds;

Cumulus (Cu), 2 - 10, 000

- "Woolpack"

- Sunny spells

Cumulonimbus (Cb), 5 - 50, 000

- "Thunderheads"

- Showers and thunder

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