May 3, 1999, is a day that Oklahomans will never forget. By the time the sun set over a ravaged plain, some 71 tornadoes had claimed around 11,000 homes and businesses and caused $1 billion in damage. One of them was a mile-wide monster of incredible power, the fiercest F5 twister to hit a metropolitan area, and whose 300 mph winds were the fastest ever recorded. Veteran journalist Nancy Mathis draws on many interviews to weave the story of those...