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(Source: thereal1990s)
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
I’ve seen a roll cloud and been right under one before, there was a huge storm at sea. I’m pretty sure I’ve got some pictures :3
(Source: collthings.co.uk)