The document describes different types of clouds found at different altitudes in the atmosphere. It discusses high-level clouds like cirrocumulus and cirrus found between 20,000-60,000 feet, middle-level clouds such as altostratus and altocumulus around 6,500 feet, and low-level clouds including cumulus and stratocumulus below 6,500 feet. It also mentions vertical clouds like cumulonimbus that extend high above their bases, as well as other unique clouds such as noctilucent and polar stratospheric clouds.

1. Clouds

2. High Clouds Polar Region Temperate Region Tropical Region Forms between 20,000 – 60,000 feet Forms between 16,500 – 40,000 feet Forms between 10,000 – 25,000 feet

3. Cirrocumulus http://en.wikipedia.org/wiki/File:Cirrocumulus4_-_NOAA.jpg

4. Cirrus http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License Fir0002/Flagstaffotos

5. Cirrostratus http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License Fir0002/Flagstaffotos

6. Middle Clouds Typically forms at 6,500 feet

7. Altostratus http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License PiccoloNamek

8. Altocumulus Bidgee http://creativecommons.org/licenses/by-sa/3.0/deed.en

9. Low Clouds Found up to 6,500 feet

10. Cumulus http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License PiccoloNamek

11. Stratocumulus ArunKulshreshtha http://creativecommons.org/licenses/by/3.0/us/deed.en

12. Nimbostratus Simon Eugster http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License

13. Stratus http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License PiccoloNamek

14. Vertical Clouds Can have strong up-currents, rise far above their bases and form at many heights.

15. Cumulonimbus http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License Fir0002/Flagstaffotos

16. Cumulus Congestus Bidgee http://creativecommons.org/licenses/by-sa/3.0/deed.en

17. Pyrocumulus Rdhettinger http://en.wikipedia.org/wiki/File:Pyrocumulus_Cloud_Station_Fire_08312009_Aerial_View.jpg

18. Other Clouds A few clouds can be found above the troposphere; these include noctilucent and polar stratospheric clouds. Some clouds form as a consequence of interactions with specific geographical features. An example of this is Morning Glory.

19. Noctilucent Hrald http://creativecommons.org/licenses/by-sa/3.0/deed.en

20. Polar Stratospheric Clouds http://en.wikipedia.org/wiki/File:Arctic_stratospheric_cloud.jpg

21. Morning Glory a special Roll Cloud Mick Petroff http://creativecommons.org/licenses/by-sa/3.0/deed.en

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