TRMM Home Page


The Tropical Rainfall Measuring Mission (TRMM), a joint mission of NASA and the Japan Aerospace Exploration Agency, was launched in 1997 to study rainfall for weather and climate research. After over 17 years of productive data gathering, the instruments on TRMM were turned off on April 8. The spacecraft re-entered the Earth’s atmosphere on June 15, 2015, at 11:55 p.m. EDT, over the South Indian Ocean, according to the U.S. Strategic Command’s Joint Functional Component Command for Space through the Joint Space Operations Center (JSpOC), and most of the spacecraft was expected to burn up in the atmosphere during its uncontrolled re-entry.  

The multi-satellite 3B42*/TMPA product will continue to be produced through early 2018 - learn more about  the transition from 3B42* to IMERG.

TRMM was a research satellite designed to improve our understanding of the distribution and variability of precipitation within the tropics as part of the water cycle in the current climate system. By covering the tropical and sub-tropical regions of the Earth, TRMM provided much needed information on rainfall and its associated heat release that helps to power the global atmospheric circulation that shapes both weather and climate. In coordination with other satellites in NASA's Earth Observing System, TRMM provided important precipitation information using several space-borne instruments to increase our understanding of the interactions between water vapor, clouds, and precipitation, that are central to regulating Earth's climate.

Extreme Weather News

Cyclones Gita's Rainfall Measured With GPM's Microwave Imager (GMI)
The GPM core observatory satellite's Microwave Imager (GMI) instrument had a fairly good view of tropical cyclone GITA on February 2018 at 0316...
Tropical cyclone GITA recently battered and drenched first Samoa and then Tonga as it passed close to both island groups. GITA was a tropical storm...
GPM Examines Tropical Cyclone Gita Over Samoa
Recently formed tropical cyclone GITA was drenching Samo when the GPM core observatory satellite passed above on February 9, 2018 at 1426 UTC....
Weakening Tropical Cyclone Cebile Examined By GPM
The GPM core observatory satellite passed above weakening tropical cyclone CEBILE on February 6, 2018 at 1151 UTC. CEBILE's maximum sustained...
GPM Probes Powerful Tropical Cyclone Cebile
Tropical Cyclone CEBILE formed four days ago in the southwest Indian Ocean southeast of Diego Garcia. Today CEBILE became the most powerful...
GPM Views Sheared Tropical Cyclone Fehi
The GPM core observatory satellite flew tropical cyclone FEHI on January 30, 2018 at 0831 UTC. GPM revealed that precipitation was only located...

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