This image is in the public domain because it contains materials that originally came from the U.S. National Oceanic and Atmospheric Administration, taken or made as part of an employee's official duties. العربية ∙ čeština ∙ Deutsch ∙ Zazaki ∙ English ∙ español ∙ eesti ∙ suomi ∙ français ∙ hrvatski ∙ magyar ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ മലയാളം ∙ Plattdüütsch ∙ Nederlands ∙ polski ∙ português ∙ română ∙ русский ∙ sicilianu ∙ slovenščina ∙ Türkçe ∙ Tiếng Việt ∙ 简体中文 ∙ 繁體中文 ∙ +/−

Transferred from en.wikipedia to Commons by Magnus Manske using CommonsHelper.

• 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