The March tornadoes in southwestern Minnesota forced many farmers to ask some very tough questions about their future. Rebuilding a farm operation broken apart by a tornado is difficult.... and this year's recovery is complicated by low grain, livestock and milk prices. Mainstreet Radio's Mark Steil reports: The tornado tore a good chunk of the roof off the dairy barn on the Ron and Penny Mohr farm near New Ulm. It also ruined a couple of feed silos, toppling concrete blocks from one into the barn. Ron Mohr says within a few hours of the storm he knew he might have to sell his milk cows: :17 (There was guy came here at ten o'clock at night to help