A study on the trajectory of flying debris in a tornado-like vortex was carried out by numerical simulation. A numerical tornado simulator was developed, which has the equivalent configuration as that of the laboratory experiment. Numerical calculations were done by Large Eddy Simulation and a series of unsteady flow fields of a tornado-like vortex was generated. Wind characteristics in the vortex were examined. Finally, three dimensional trajectories of flying debris were computed and the statistical distributions of the maximum horizontal speed of debris were obtained. (C) 2011 Elsevier Ltd. All rights reserved.