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

Typhoon Maria Makes Landfall
After striking the Ryukyu Islands of Japan and grazing Taiwan with torrential rains, Typhoon Maria made landfall just north of the populous city...
On the morning of 7/9/18 the GPM Core Observatory satellite flew over powerful Typhoon Maria, observing a donut-shaped eyewall that is somewhat...
GPM IMERG Analyzes Rainfall from Powerful Typhoon Prapiroon
The image above shows estimates of accumulated rainfall using IMERG (Integrated Multi-satellitE Retrievals for GPM) data formed during the period...
GPM Views Super Typhoon Maria Near Guam
View full screen in STORM Event Viewer. Rapidly intensifying after its genesis near Guam, Super Typhoon Maria featured winds near 130 knots...
GPM Views Hurricane Fabio off the Coast of Mexico
View fullscreen in STORM Event Viewer Off the southwest coast of Mexico, Hurricane Fabio has winds approaching 80 knots in this overflight, with a...
Eastern Pacific Tropical Storm Fabio Examined With GPM Satellite
NASA's GPM core observatory satellite flew above tropical storm FABIO in the eastern Pacific Ocean south of Mexico on June 30, 2018 at 10:46 PM...

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