The Verification of the Origins of Rotation in Tornadoes Experiment 2 (VORTEX2) is the largest tornado research project in history to explore how, when and why tornadoes form. The National Oceanic and Atmospheric Administration (NOAA) and the National Science Foundation (NSF) are supporting more than 100 scientists and students and staff from around the world to collect weather measurements around and under a supercell thunderstorm. VORTEX2 teams are using a fleet of 10 mobile radars, and 70 other instruments all equipped with cutting-edge communication and computer technologies. Much about tornadoes remains a mystery, and researchers hope this data will help them better understand tornadoes and lead to further improvements in tornado warning skill. This years field operations will take place from May 1st through June 15th.