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

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This statement is true. A dryline is a boundary between dry, desert air and moist, maritime air. Thunderstorms can form along a dryline when the moist air rises and cools, condensing into clouds and releasing energy in the form of thunder and lightning. Severe thunderstorms can also occur along a dryline because of the steep temperature gradient and wind shear that exists across the boundary.

A Squall Line with Severe Thunderstorms Can Also Form Along