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Squall Lines
A squall line is a line of thunderstorms that forms along or in front of a cold front. Pre-frontal squall lines may spawn severe thunderstorms with large hail and tornados. They are typically the largest type with a horizontal extent of 600 miles. Ordinary squall lines are usually shallower than pre-frontal squall lines and do not last as long. They typically feature less severe weather such as air mass thunderstorms.
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