Roll Clouds
(Posted by adam)
These rare long clouds may form near advancing cold fronts. In particular, a downdraft from an advancing storm front can cause moist warm air to rise, cool below its dew point, and so form a cloud. When this happens uniformly along an extended front, a roll cloud may form.Image and text from "Astronomy Picture of the Day."
Bookmark this post: Posted by adam on January 17, 2006 at 10:46 AM
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Comments
looks insecure.
Posted by: sama | January 17, 2006 1:21 PM
I used to see those from time to time, when I lived in the Midwest. They're frequently found at the leading edge of intense thunderstorms. Sometimes the whole cloud rotates along a horizontal axis, in a rather unsettling way.
Posted by: David Brodbeck | January 17, 2006 2:35 PM