NASA's TRMM Satellite Measures Cyclone Yasi's Rainfall (IMAGE) NASA/Goddard Space Flight Center Caption The TRMM satellite measured the rainfall rates within powerful Cyclone Yasi when it passed over on Feb. 1, 2011 at 0356 UTC (Jan. 31 at 10:56 p.m. EST). Yasi had a small eye surrounded by powerful thunderstorms. The heaviest rainfall (falling at about 2 inches (50 mm) per hour) appears in red. The yellow and green areas indicate moderate rainfall between .78 to 1.57 inches (20-40 mm) per hour. Credit SSAI/NASA, 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.