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Every morning at seven, Andrew Welch wakes up, cooks breakfast and checks the rain gauge sitting on a five-foot post in his backyard. He writes down the measurement, sends his kid off to school and then heads out to his workplace as a structural engineer. Welch is a citizen scientist. Around the world, hundreds of citizen scientists like him are collecting precipitation measurements from the ground that are useful for NASA’s Global Precipitation Measurement (GPM) mission. CoCoRaHS volunteers stand with Dr. Walt Petersen, far left, Dr. Jackson Tan, third from right, and Dr. Tiffany Moisan, far...

In 1997 when the Tropical Rainfall Measuring Mission, or TRMM, was launched, its mission was scheduled to last just a few years. Now, 17 years later, the TRMM mission has come to an end. NASA and the Japan Aerospace Exploration Agency (JAXA) stopped TRMM’s science operations and data collection on April 8 after the spacecraft depleted its fuel reserves. TRMM observed rainfall rates over the tropics and subtropics, where two-thirds of the world’s rainfall occurs. TRMM carried the first precipitation radar flown in space, which returned data that were made into 3-D imagery, enabling scientists...

Deputy Project Manager, Global Precipitation Measurement (GPM) NASA/Goddard Space Flight Center Candace Carlisle has been the GPM Deputy Project Manager at NASA's Goddard Space Flight Center since 2006. Prior to GPM, she spent five years on the Space Technology 5 (ST5) project, first as Mission Systems Engineer, then as Deputy Project Manager. The ST5 spacecraft, as well as the launch vehicle support structure and deployment mechanisms, were built, tested, and operated in-house at Goddard. Candace’s previous experience includes six years on the Earth Science Data and Information System (ESDIS)...

Project Manager, Global Precipitation Measurement (GPM) NASA/Goddard Space Flight Center Ardeshir (Art) Azarbarzin has been the Project Manager of GPM since 2006. Art obtained his college education from the University of Illinois, where he graduated with a B.S. in Electrical Engineering in 1978 and followed with a M.S. in Aeronautical & Astronautical Engineering in 1980. He began his career at Sundstrand Aviation, as the Design/Project Engineer for Cessna Jet Electro-mechanical Flap Actuation Project. Following that, he was the Systems Engineer for the C-130 Aircraft High Technology Test Bed...