NASA Sees Nadine Strengthening (IMAGE) NASA/Goddard Space Flight Center Caption This infrared image was created from AIRS data on Sept. 28 at 0441 UTC (12:41 a.m. EDT) when Nadine was a strengthening tropical storm. Strongest thunderstorms with very cold cloud top temperatures (colder than -63F/-52 C) appear in purple surrounding the center of circulation. Credit Credit: NASA JPL/Ed Olsen 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.