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Image Caption: Cloud-top morphology and the tropopause

Using stereographic analysis of this and one other near- vertical view, relative cloud heights were calculated. The wavy, circular cloud structure (center) was determined to be a large dome protruding into the stratosphere. This finding contradicts the existing idea that the upper surfaces of circular cloud features are flat with some overshooting tops. The eye of the storm and some typical overshooting tops appear to the left of this unusual structure. (From Black 1977)