NASHVILLE, Tenn. — Tornadoes ripped across Tennessee early Tuesday, shredding at least 40 buildings and killing at least 19 people. One of the twisters caused severe damage across downtown Nashville, destroying the stained glass in a historic church and leaving hundreds of people homeless. Daybreak revealed a landscape littered with blown-down walls and roofs, snapped power lines and huge broken trees, leaving city streets in gridlock.