GPM Flyby of Tropical Storm Koppu (video) NASA/Goddard Space Flight Center Share Print E-Mail Loading video... Caption On Oct. 13 GPM showed that numerous intense thunderstorms near the tropical storm's center of circulation were dropping rain at a rate of over 88 mm (3.5 inches) per hour. Some thunderstorm cloud-top heights reached altitudes above 17.8 km (11 miles). Credit Credits: SSAI/NASA/JAXA, Hal Pierce Usage Restrictions None Share Print E-Mail 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.