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 IMERG Adds Up Heavy Rainfall from Super Typhoon Mangkhut
#NASA's GPM IMERG data product was used to estimate the devastating heavy rainfall that fell on China and the Philippines from #TyphoonMangkhut...
Hurricane Florence Makes Landfall, Brings Torrential Rains and Record Flooding to the Carolinas
Over the weekend #HurricaneFlorence brought torrential rains and record flooding to the Carolinas. This GPM IMERG visualization shows storm-total...
GPM Observes Dangerous Super Typhoon Heading Toward The Philippines
The GPM core observatory satellite has recently provided very useful information about super typhoon MANGKHUT in the western Pacific Ocean. A few...
GPM Probes Tropical Storm ISAAC
Hurricane Florence, tropical storm ISAAC and hurricane Helene are currently active in the Atlantic Ocean. Tropical storm ISAAC is the next tropical...
GPM Views Super Typhoon Mangkhut Moving Towards the Coast of China
View Fullscreen in STORM Event Viewer A day after rolling through the southern Mariana Islands, causing wind and water damage to Guam and...
GPM Sees Heavy Rain In Menacing Hurricane Florence
Last Friday Florence was a sheared tropical storm but on Saturday vertical shear lessened and Florence started to get better organized. Today...

View the Extreme Weather Archive


Displays of realtime data on this site may be intermittent today due to server maintenance.

Download TRMM Data