- Close view of the bottom of a shelf cloud with scud teeth
- W990992Z
- Close view of part of W990986S, showing the bands along the bottom of the shelf cloud and the ruffles below it where the cool, moist air is condensed as it ascends abruptly along the advancing gust front. These scud teeth indicate small-scale differences in moisture due to mixing, or locally stronger streams of outflow along the boundary.
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