1. Cloud Types

2. 20,000 – 43,000 ft
Cirrus
High Level
wispy, feathery, hairlike, delicate fibers, streaks or plumes

3. Cirrocumulus
High Level
Appears as tufts, in lines or groups, sometimes in ripples

4. Cirrostratus
High Level
Veil of fused sheets of ice crystals, milky.
Sun and moon halos.

5. Cloud Types Mid-level

6. Altocumulus
Middle Level
Patches of cotton balls

7. Altostratus 6,500 – 20,000 ft. Altostratus Middle Level
Thin to thick with no halos, sun’s outline just visible, grey day

8. Cloud Types Low Level

9. Nimbostratus
Grey dark low clouds with drizzling rain

10. Stratus
Low Level
Uniform, featureless, grey, like high fog

11. Stratocumulus
Low Level
Soft, grey, globular mases in lines, groups, or waves, heavy rolls, irregular overcast patterns.

12. Cloud Types Vertically developed

13. Cumulus
Vertically developed
Sharply outlined, puffy, billowy, flat based, swelling tops, fair weather

14. Cumulus
Vertically developed
Sharply outlined, puffy, billowy, flat based, swelling tops, fair weather

15. Cumulonimbus Vertically developed
Dense, heavy, dark massive thunderstorms
hard showers, explosive top, great vertical development
cirrus topped plume blown into anvil shaped head.

16. Cumulonimbus
Vertically developed
Dense, heavy, dark massive thunderstorms
hard showers, explosive top, great vertical development
cirrus topped plume blown into anvil shaped head.