(Darke County, OH)--The National Weather Service investigated damage in Darke County over the weekend and determined that a tornado touched down on Friday night.  As tornados go, it was very weak.  It was rated an EF-O with a maximum wind speed of 65 miles per hour.  It touched down along Greenville-Celina Road at just after 7:30 Friday night.  One building sustained moderate damage.  There were no injuries.