Balloon Probe Lifts for Tornado Studies (VIDEO) Penn State This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Two Penn State professors send temperature and pressure probe into the clouds of a possible tornado precursor storm to learn more about how tornados form. Credit Penn State College of Earth & Mineral Sciences Usage Restrictions Non commercial use only 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.