Study: Small changes could prevent twister damage

A new study of tornado destruction in Tuscaloosa found that relatively minor changes in construction — things like better shingles, more anchors and thicker vinyl siding — could have prevented much of the damage to houses on the fringes of the twister. Researchers said nothing could have saved structures that were in the direct path of the EF-4 tornado, which skirted the University of Alabama campus with winds up to 190 mph on its way through the city. Forecasters said it was one of the strongest twisters to...