line squall

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line squall Stormy conditions, with sudden changes of wind and heavy cloud, often involving thunderstorms and a temperature fall, which are often associated with the passage of a cold front. The squall defines the line of the cloud and wind structure. Warm air is overrun by cold air to produce the squall line.

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line squall Stormy conditions, with sudden changes of wind and with heavy cloud, often involving thunderstorms, and a temperature fall, often associated with the passage of a cold front; it defines the line of the cloud and wind structure. Warm air is overrun by cold air to produce the squall line.