SERIAL DERECHO

A serial derecho event (hatched area) is typically associated with an extensive squall line (dashed & two dotted line) with multiple embedded bow echoes. Within the squall line, the bow echoes may be of widely varying sizes. Serial derecho events are usually associated with a well defined, migrating low pressure system.

PROGRESSIVE DERECHO

A progressive derecho event (hatched area) is typically associated with a squall line of restricted length (dashed & two dotted line) which may involve a single bow echo or multiple bow echoes. Progressive derecho events are usually associated with a stationary front in a rather stagnant weather pattern.

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