UAS Testing (IMAGE) University of Colorado at Boulder Caption An international team of scientists and students led by CU-Boulder used multiple unmanned aircraft to simultaneously intercept the outflow of a thunderstorm at Colorado's Pawnee National Grassland in August 2014. Such information should help scientists better understand extreme weather tied to tornado activity. Credit Jack Elston, University of Colorado Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.