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Storms
If you know where and when to look, you can
treat yourself to a colourful display of atmospheric
haloes, spots and pillars. These images can tell you
something about the clouds overhead and possible
changes in the weather. All of these images are
created by light shining through cirrostratus clouds.
These clouds occur at an altitude of 6,000-12,000
metres. They appear as a thin sheet or layer
(strata) that is pure white. The layer of cloud is so
thin (only 100-450 metres) that is doesn't obscure
the sun or moon, so you should be able to see
your shadow. Cirrostratus is made of many types
of ice crystals. However, four crystal shapes
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