GPM Image of Ana (1 of 2) (IMAGE) NASA/Goddard Space Flight Center Caption The GPM satellite flew over when ANA was making the change from subtropical storm to tropical storm. Credit NASA/SSAI, Hal Pierce 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.