It sounds like something from the movie "Twister" -- teams of scientists in vans, armed with high-tech measuring equipment, barreling across the Oklahoma plains in search of tornadoes.
But these scientists are colleagues, not rivals, and these storms aren't Hollywood digital wizardry but the real thing.
Welcome to VORTEX2, or V2 for short, the largest and most ambitious field experiment ever devoted to studying tornadoes. Now under way through June 13 in Oklahoma and surrounding states, the project brings together almost 100 scientists and students from 16 universities and research institutes. 
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All About Tornadoes