NASA 3-D Image of Tropical Depression 14 (IMAGE) NASA/Goddard Space Flight Center Caption On Sept. 10, the TRMM satellite showed System 91L was getting organized and that convective storms were dropping heavy rain to the northwest and northeast of the center of the circulation. Those thunderstorms northeast of the center were reaching heights of about 13km (~8.1 miles). It became Tropical Depression 14 on Sept. 11. Credit Hal Pierce, NASA/SSAI 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.