Catastrophe modeling firm AIR Worldwide estimates that insured losses to residential, commercial and industrial properties and their contents, and to automobiles from the severe thunderstorm outbreak that struck the U.S. from April 22–April 28, 2011, are between USD 3.7 billion and USD 5.5 billion. One week after a violent severe weather outbreak across the Southern and Southeastern United States, thousands of disaster response personnel and inspectors remain on the ground to provide emergency relief and security, perform damage assessments, clear debris, and plan recovery efforts.