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 2019 - 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

Italy's Extreme Rainfall Examined With IMERG
During the past week a strong low-pressure system moving through southern Europe battered, drenched and flooded Italy. It caused flooding,...
GPM Examines Weaker Tropical Storm Yutu in the South China Sea
Typhoon YUTU (known as Rosita in the Philippines) is now threatening the Philippine Island of Luzon. On October 24, 2018 YUTU devastated the...
GPM Flies Over Powerful Typhoon Yutu
View fullscreen in STORM Event Viewer Minutes before landfall on the island of Tinian, Yutu had a central pressure below 900 mb and...
Dangerous Hurricane Willa Probed By GPM Satellite
Hurricane Willa was moving northward toward the western coast of Mexico when the GPM core observatory passed above on October 21, 2018 at 1:51 PM...
GPM IMERG Measures Hurricane Michaels Rainfall Accumulation
At least eleven deaths have now been attributed to deadly hurricane Micheal. Some casualties resulted not only from Micheal's destructive winds and...
GPM Views Dissipating Hurricane Michael Soaking the U.S. East Coast
View fullscreen in STORM Event Viewer Hundreds of miles way from its landfall in Mexico Beach, Florida, Michael has been downgraded to a tropical...

View the Extreme Weather Archive


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

Download TRMM Data