TRMM Sees Henriette (image) NASA/Goddard Space Flight Center Caption TRMM is able to measure rainfall occurring in a storm from space. Rainfall is derived from TRMM's Microwave Imager and Precipitation Radar instruments. TRMM's PR instrument measured rain falling at the rate of over 55.46 mm (~2.2 inches) per hour a towering thunderstorm near Henriette's center. Credit SSAI/NASA, Hal Pierce Usage Restrictions None 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.