Haloes Forecast Storms NEWSCIENCE 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 are responsible for producing most of the commonly see haloes-plate crystals, columns, capped columns and bullets. The most obvious halo is fou....

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