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

IMERG Shows Darby's Rainfall Over The Hawaiian Islands
Most of the Hawaiian Islands were spared serious damage from tropical storm Darby. The location of Darby's track through the Hawaiian Islands...
Tropical Storm Darby Brings Occasionally Heavy Rain To The Hawaiian Islands
Tropical storm Darby has caused some heavy rainfall in the Hawaiian Islands since hitting the big island (Hawaii) on Saturday July 23, 2016. After...
GPM Observes Newly Formed Tropical Depression Eight-E
The eastern Pacific Ocean continues to show that it's environment is favorable for the birth of tropical cyclones. Tropical Depression EIGHT-E (...
GPM Sights Another Forming Tropical Cyclone
The eastern Pacific Ocean continues to spawn tropical cyclones. Seven named tropical cyclones have already formed in the Eastern Pacific ocean...
GPM Used To Evaluate Tropical Storm Estelle
The GPM core observatory satellite traveled above tropical storm Estelle on July 19, 2016 at 1036 UTC. This pass showed that Estelle contained...
Southern Hemisphere Tropical Cyclone ABELA Viewed By GPM
Tropical cyclone 01S (Abela) formed in the South Indian Ocean on July 16, 2016. Abela was the first tropical Cyclone to form in July over the...

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