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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

GPM Sees Weekend Texas Tornadoes
Stormy spring weather over the Southwest popping up during the past weekend with at least twenty tornadoes sightings over Texas on Sunday April 26...
A GPM View of Tornado Spawning Thunderstorms
Twelve tornado sightings reported to NOAA yesterday were associated with severe thunderstorms extending from the Texas Gulf coast, through Oklahoma...
GPM Sees Remnants of Joalane
The GPM core observatory satellite had a last look at the remnants of Cyclone Joalane in the South Indian Ocean on April 14, 2015 at 1135 UTC (...
TRMM Measures Rainfall In Ikola And Joalane
Since being launched in November 1997 the TRMM satellite produced huge volumes of precise precipitation measurements for use in climatology . Near...
GPM Looks Into Cyclone Joalane's Eye
Cyclone Joalane had developed a small clear eye when the GPM core observatory satellite passed above on April 7, 2015 at 1436 UTC. GPM's Microwave...
GPM Measures Rain in Cyclone Joalane
Two powerful tropical cyclones called Ikola and Joalane are now moving through the South Indian Ocean. The GPM core observatory satellite...

View the Extreme Weather Archive


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