This time I was blinded by my habit of watching urban morphologies. I didn´t see at first the path of the tornadoes in Alabama, 2011, I was just trying to understand the city´s shape. Until I read the following, from National Geographic:
Photograph by Digitalglobe
ALABAMA On April 27, 2011, the U.S. was hit by 199 tornadoes, a single-day record—but there's no clear evidence, scientists say, of a long-term rise in tornado frequency. The 190-mile-an-hour twister that carved a sharp path across Tuscaloosa missed the University of Alabama football stadium (upper left) by a mile, then threaded between a large mall (X-shaped building at center) and the main hospital, which was soon treating victims. The tornado killed 44, then roared northeast to the Birmingham area, where it killed 20 more.