- Cloud billows on sloped boundary of a weak warm front
![Cloud billows on sloped boundary of a weak warm front](http://www.skyartstock.com/peas/W943743Z-SKYART.jpg)
- W943743Z
- Cloud billows. Warm air overrides colder air along the shallow sloped boundary of a weak warm front. The slowly ascending stream of air creates uniform rollers in a low cloud layer. The clouds and billows both move to the left but the waves travel faster through the sheet.
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