The Late July 2012 North American derecho was a damaging severe thunderstorm event which impacted the Northeast through Midwest United States. The serial derecho began over Lake Erie, and spread rapidly to the northeast and southwest as it made landfall in northern Ohio and Pennsylvania. Several bow echos developed separately, even taking on the characteristics of multiple single-bow derechos, before all of the segments connected into a line echo wave pattern, the classic shape of a multi-bow serial derecho on radar. Notably, the derecho was the fourth to hit the US within 4 weeks, and some areas such as Dayton, Ohio experienced three derechos within this span, where on average they receive only one derecho per year. Remnants of the derecho continued to produce isolated severe weather acro