Tornado that hit Dayton-area upgraded to EF4; strongest in Ohio since 2010

DAYTON, Ohio — The National Weather Service says one of the tornadoes that tore through western Ohio this week was the strongest in the state since 2010.Survey teams have confirmed at least 18 tornadoes touched down in the region during storms Memorial Day evening and early Tuesday. A total of 20 tornadoes have been confirmed statewide.The Weather Service on Thursday upgraded one of three reported EF3 "severe" tornadoes to an EF4, which signifies "devastating." The service says the tornado