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

GPM Views Hurricane Gaston Eye Wall Replacement
Hurricane Gaston was located in the central Atlantic Ocean west of Bermuda when the GPM core observatory satellite passed over on August 30, 2016...
Tropical Depression Nine Forms
The frequency of tropical cyclone formation has definitely increased in the Atlantic Ocean basin. A tropical wave that the National Hurricane Center...
GPM Examines Threatening Tropical Disturbance
On August 25, 2016 at 0716 UTC (3:16 AM EDT) the GPM core observatory satellite had an excellent look at an area of low pressure associated with a...
Gaston Hovers Around Hurricane Intensity as it Moves into the Central Atlantic
Gaston became the 3rd hurricane of the season early this morning (just after midnight EDT) as the storm was moving northwestward into the Central...
GPM Examines Tropical Storm Lester
Lester became the 12rd named storm of the 2016 eastern Pacific Ocean hurricane today. Lester was far away from the Mexican coast early today and...
Typhoon Lionrock's Intensification Seen By GPM
Since August 15, 2016 Japan has been by hit by three tropical cyclones called Mindulle, Chantu and Kompasu. Tropical cyclone Lionrock may be the...

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