Terra Image of Genevieve (IMAGE) NASA/Goddard Space Flight Center Caption On Aug. 17 at 1:15 a.m. EDT (0515 UTC), the MODIS instrument aboard NASA's Terra satellite gathered temperature information about Genevieve's cloud tops. MODIS found the most powerful thunderstorms (red) were in the developing eyewall, where temperatures were as cold as or colder than minus 70 degrees Fahrenheit (minus 56.6 Celsius). C Credit redit: NASA/NRL 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.