Topic: NATURE - on January 7, 2010 at 10:10:00 AM CET
Amazing cloud roll captured on camera
They are most common when an advancing storm front causes moist air to rise, then cool to the point where it becomes a cloud known as the dew point.
When this happens along a front, a roll cloud can form, often with air actually circulating along the horizontal axis of the cloud.
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greetz from ps :D
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