- Outflow creates a roll cloud sausage with a low Pileus cap
- W970444Z
- Strong winds and outflow are pushing a roll cloud toward the clearing sky out of a large storm with an anvil and mamma overhead. The sausage of cloud rolls as the cooler outflow air undercuts warmer air at the base level, causing lift and condensation along the boundary. A low Pileus cloud has formed at left, above a growing cloud element.
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