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 and the spacecraft will slowly descend from its orbit. The multi-satellite 3B42*/TMPA product will continue to be produced through mid-2017 - learn more about  the transition from 3B42* to IMERG.

Read the Frequently Asked Questions about TRMM's Descent

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

Two Future Typhoons Monitored By GPM
A chain of tropical cyclones has started forming in the western Pacific Ocean. The GPM core observatory satellite saw two of them this morning....
GPM Has A Good Look At Tropical Storm Raquel
The GPM core observatory satellite recently had an excellent view of tropical storm Raquel in the South Pacific Ocean. Raquel was moving over the...
Tropical Depression Chan-Hom Forms In Western Pacific
The GPM core observatory satellite flew over a newly formed tropical depression Chan-Hom (09W) on June 30, 2015 at 0841Z. GPM's Microwave Imager (...
During the past week the combination of tropical storm Bill's landfall and a slowly moving frontal system extending from the Midwest to the...
Weakening Tropical Storm Bill Seen By GPM
The GPM core observatory satellite had a good daytime look at tropical storm Bill on Wednesday June 17, 1015 at 1552 UTC ( 10:52 AM CDT). GPM saw...
IMERG Sees Gulf Rainfall With Tropical Storm Bill
Tropical storm Bill became the second named tropical cyclone in the Atlantic Ocean Basin when it formed in the western Gulf Of Mexico on June 16,...

View the Extreme Weather Archive


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

Download TRMM Data