UAH radar Instrument Showing Multiple Tornado Supercell Storms (IMAGE) U.S. National Science Foundation Caption A special UAH radar instrument shows multiple tornado supercell storms on April 27, 2011. Credit Kevin Knupp 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.