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TRMM operated from 1997 - 2015 and carried the first on-orbit active/passive instruments to study tropical rainfall. 3B42* data will continue through early 2018 ...more

An international satellite mission launched by NASA and JAXA on Feb. 27, 2014, that is setting new standards for precipitation measurements worldwide using a network of satellites united by the GPM Core Observatory. Get data

Atmospheric River Slams California
After more than four years of drought, Californians may wonder where the current rain is coming from. Using satellites, NASA scientists have a unique view of the sources of precipitation, and how it reaches the western United States. Rain is often carried by narrow tendrils of moisture called atmospheric rivers that occur all over the world, shown here in white. The atmospheric rivers that affect the western United States are known as the...
Atmospheric River Slams California
GPM Sees Hurricane Matthew Nearing Florida
UPDATE 10/6/16:  NASA's Global Precipitation Measurement mission or GPM core observatory satellite flew over Hurricane Matthew several times as the category 4 storm headed toward Florida. The GPM Core Observatory carries two instruments that show the location and intensity of rain and snow, which defines a crucial part of the storm structure – and how it will behave. The GPM Microwave Imager sees through the tops of clouds to observe...
GPM Sees Hurricane Matthew Nearing Florida
GPM Gets a Closer Look at Louisiana Floods
Twice on August 12, 2016 GPM flew over a massive rainstorm that flooded large portions of Louisiana. The flooding was some of the worst ever in the state, resulting in a state of emergency. Tens of thousands of people were evacuated from their homes in the wake of this unprecedented event. Throughout the course of August 12 (UTC) GPM captured the internal structure of the storm twice and GPM IMERG measured the rainfall accumulation on the...
GPM Provides a Closer Look at the Louisiana Floods
GPM Sees Hermine's Twin Towers
In order for Hermine or any other tropical depression, to intensify there must be a pathway for heat energy from the ocean surface to enter the atmosphere. For Hermine, the conduit may have been one of the two "hot towers" that the Global Precipitation Measurement mission or GPM core satellite observed on Aug. 31 at 4:09 p.m. EDT (2009 UTC).
NASA Sees Hermine's Twin Towers
TRMM Wins the 2016 Group Pecora Award
The William T. Pecora Award is presented annually to individuals or groups that make outstanding contributions toward understanding the Earth by means of remote sensing. The award is sponsored jointly by the Department of the Interior (DOI) and the National Aeronautics and Space Administration (NASA). The award was established in 1974 to honor the memory of Dr. William T. Pecora, former Director of the U.S. Geological Survey and Under...
TRMM wins the 2016 Group Pecora Award
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FEATURED ARTICLES

LATEST HALF-HOURLY PRECIPITATION

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

IMERG Early Run image of the Earth displaying the last half hour of global precipitation rates

EXTREME WEATHER NEWS

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GPM Data

Get GPM Data logo - new users start here.

Precipitation data from the GPM and TRMM missions is made available free to the public in a variety of formats from several sources. This section outlines the different types of data available, the levels of processing, the sources to download the data, and some helpful tips for utilizing precipitation data in your research. 

Training

Example screenshot from a Giovanni training session

Learn how to access and analyze global precipitation data in this series of training sessions. Register for upcoming training sessions and download videos and slides from past training sessions. Topics include: Overview of GPM data and tools, GPM data search and analysis, data import and analysis in GIS, using Python with GPM data, and more.

Multimedia

Screenshot from GPM launch animation

Photos and videos that tell the story of the Precipitation Measurement Missions. Watch the GPM Core Observatory being built and tested at NASA Goddard, learn about the science of measuring precipitation, and more.

Science

Example of TRMM DPR data.

Through an advanced set of instruments, TRMM and GPM provide new information on precipitation characteristics and how rain and snow interact within the Earth system. This section explores how space-borne precipitation measurements are acquired, processed, and utilized.

 

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