Over the course of five days last week, more than 150 tornadoes were reported across a dozen states. Belonging to two separate weather systems, they left enormous trails of wreckage strewn across the southern United States and Ohio River Valley and took the lives of 39 people. At least two of the tornadoes were given the severe rating of EF4, with sustained winds of between 267 and 322 kph (166 - 200 mph). Many residents have now returned to their damaged farms and neighborhoods to search for items that may have survived the storms, assess the damage, and plan their next steps. The images in this collection show the ferocity of these forces of nature and the fragility of even the strongest man-made structures.