- This forward side of a squall line has a wavy gust front boundary
- W012912S
- This forward side of a squall line has a wavy gust front boundary as outflow lobes push forward in some places while holding back at others. These waves can lead to locally converging air pockets and updrafts or even separate storm cells along the forward edge, which causes the squall line to have a line echo wave pattern, or LEWP, along it.
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