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Altostratus Clouds

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Altostratus: These gray or bluish-gray clouds form between 6000 and 20000 feet (1,8 and 6 km) above sealevel. Altostratus clouds cover the entire sky over an area that usually extends over hundreds of square kilometers. The sun may be visible under thinner sections of the cloud as a dim round disk, known as a "watery sun". Altostratus clouds usually form ahead of a front producing widespread and mostly continuous precipitation. Altostratus clouds do not allow enough sunlight to break through the cloud to form any shadows on the ground.




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