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 Observes Tropical Storm Gaston's Development
Tropical storm Gaston became the 7th named tropical storm in the Atlantic Ocean after forming southwest of the Cape Verde Islands on Monday evening...
The first typhoon in the western Pacific Ocean (NEPARTAK) didn't form until July this year. Since then tropical cyclone activity has increased...
GPM Satellite Sees Forming Atlantic Tropical Depression
Tropical Depression Six (TD06L) formed in the Eastern Atlantic Ocean southwest of the Cape Verde Islands late Tuesday evening. TD06L has become...
Deadly Flooding Gulf Coast Rainfall Measured By NASA's IMERG
An extremely severe rainfall event hit the states of Louisiana and southern Mississippi when a very slow moving low pressure system continuously...
Extreme Rainfall Along the Gulf Coast Measured by IMERG
For the better part of a week, a persistent, mid-level area of low pressure has been tapping into warm, moist air to produce stormy weather in the...
Deadly Hurricane Earl's Rainfall Measured With IMERG
Hurricane Earl began as a tropical wave that was tracked by the National Hurricane Surface (NHC) from the African Coast to the Caribbean Sea. The...

View the Extreme Weather Archive


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

Download TRMM Data