meanile, the national weather service has confirmed fivevetornados touched down statewide yesterday.one of the harder hit areas was knoxville iowa where an ef-1 tornado hit. there, part of the roof of the local walmart caved in. governor terry branstad toured the town today to survey some of the damage. ef-1 tornados are considered "weak" on the fujita scale, but still have winds as strong as 110 mimis per hour. cbs 2 news has learned the name of a woman killed after being hit by a semi-truck last night in l)nn county. the sheriff's office tells cbs enterancncof palisades-keplre state park. park.authorities say that 17- year-old johann gingerich-feil was in t eastbound lanes - when she was struck and killed. the drivererf the semi wasn't hurt. right now, authorities are not saying why she was in the street. each year, 20 iowans die hfrom a heroin overdose.today a group of more than 200 people e gathered to discuss the issue at a symposium at the university of iowa. "heroin is such a critical piece, it really has reached epidemic level at this point. if you don't work together we are goi