VORTEX
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Verification of the Origins of Rotation in Tornadoes Experiment or VORTEX, is a field project that seeks to understand how a tornado is produced by deploying around 18 vehicles that are equiped with customized instruments used to measure and analyze the weather around a tornado. The project has also stated that it is interested in why some supercells produce tornadoes while others do not. The original project took place in 1994 and 1995, and another project was run in 1999.
The movie Twister was at least partially inspired by the VORTEX project.
A second VORTEX project has been proposed numerous times, most recently for 2008.
