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 mid-2017 - learn more about  the transition from 3B42* to IMERG.

TRMM is 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 provides 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 provides 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

Tropical Storm Erika Enters the Caribbean
Tropical Storm Erika, the 5th named storm of the season, entered the northeast Caribbean early this morning as it passed through the Leeward Islands...
Ignacio Expected To Pass Near Hawaii
Hurricane Ignacio is the latest tropical cyclone in this busy 2015 eastern Pacific hurricane season to pose potential danger for the Hawaiian...
Hurricane Loke Viewed By GPM
This year the Eastern Pacific Ocean continues to spawn significant tropical cyclones. Hurricane Loke formed southwest of the Hawaiian Islands on...
Tropical Depression Twelve Upgraded To Tropical Storm Ignacio
Today tropical Storm Ignacio became the 16th 2015 tropical cyclone to form in the eastern Pacific this year putting it a couple weeks ahead of...
GPM Sees Energetic Tropical Depression Kilo
Rainfall associated with tropical depression Kilo recently dumped heavy rain in some areas of the state of Hawaii. Tropical depression Kilo changed...
Tropical Depression Kilo May Be A Problem For Hawaii
A tropical depression labeled Kilo formed to the southeast of the Hawaiian Islands on August 20, 2015. The tropical cyclone has moved to the...

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