English: 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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2008-06-13 18:25 Wnt 312×281× (15754 bytes) {{Information |Description=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 usu
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{{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} {{Information |Description={{en|A progressive derecho event (hatched area) is typically associated with a squall line of restricted len