Houston Chronicle: For this year`s tropics season, the National Hurricane Center won`t abandon the venerable Saffir-Simpson scale, which rates hurricanes on a familiar scale, from Category 1 to Category 5. But the center`s director says any single index cannot begin to capture the local impact of a hurricane, a fact Hurricane Ike — only a Category 2 storm on the Saffir-Simpson scale — made stark to residents of the upper Texas coast. “If I could wave a wand and make it go away, I would,” said …