- A rough tube of scud below shelf cloud base
![A rough tube of scud below shelf cloud base](http://www.skyartstock.com/peas/W941970Z-SKYART.jpg)
- W941970Z
- A fresh outflow surge along a gust front forms a rough tube of scud below the main shelf cloud base. These light cloud scraps only form when a new push of outflow with undiluted moist air from the rain is carried to the front edge. Rapidly forming low scud below the shelf cloud is a good warning signal for potentially strong, damaging winds to come.
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