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 Data Used to Evaluate Hawaii's Flooding Rainfall
A low pressure trough moving slowly westward through the northwestern Hawaiian Islands caused destructive flooding and mudslides over the past...
GPM Catches Line of Strong Storms Responsible For Tornadoes in Eastern U.S.
Yesterday, Sunday April 15th, a line of strong storms at one point stretched from the Florida Straits below the Florida Keys all the way up the East...
Tropical Cyclone Keni Drops Heavy Rain Over Fiji With A Direct Hit To Kadavu
As expected, tropical cyclone KENI followed a track similar to tropical cyclone JOSIE and passed to the southwest of Fiji's main island of Viti Levu...
GPM Sees Keni Following Tropical Cyclone Josie's Track
Another tropical cyclone called KENI has formed in the South Pacific Ocean between Vanuatu and Fiji. The Joint Typhoon Warning Center (JTWC) issued...
GPM Shows Rainfall Southeast Of Sheared Tropical Cyclone Iris
The GPM core observatory satellite again passed over the center of tropical cyclone IRIS on April 6, 2018 at 0027 UTC (10:27 AM AEST). The...
GPM Satellite Probes Tropical Cyclone Iris Near Australian Coast
IRIS has taken a long, fluctuating and serpentine trek since the tropical cyclone formed in the Coral Sea northeast of Australia on March 24. For a...

View the Extreme Weather Archive


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

Download TRMM Data