arrogantlampshade:

1. Nacreous Clouds

2. Mammatus Clouds

3. Altocumulus Castelanus

4. Noctilucent Clouds

5. Mushroom Clouds

6. Cirrus Kelvin-Helmholtz

7. Lenticular Clouds

8. Roll Clouds

9. Shelf Clouds

10. Stratocumulus Clouds

(Source: collthings.co.uk, via happysunnydays)