A squall line with severe thunderstorms can form along a boundary called a dryline, a narrow zone along which there is an abrupt change in moisture.

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A dryline is a boundary between two different air masses, typically one that is hot and dry and one that is warm and moist. Severe thunderstorms can often form along this boundary as the different air masses collide and create instability in the atmosphere.

A Squall Line with Severe Thunderstorms Can Form Along a Boundary