Data News

Presently, PPS web services are experiencing intermittent unavailability and/or slow response times.  PPS is aware of this issue and our System Programmers are working diligently to correct these issues.

The current anomaly affects our arthurhou server which include the PPS Public site , FTP services,  STORM: and THOR (THOR online) , etc.

We hope to have all these services restored to normal as soon as possible and will keep you informed as the situation changes.

We regret any inconvenience that this may cause and kindly appreciate your patience. 


Effective about 18 UTC July 21 the GPM MOC stopped sending data to the PPS. This was not a satellite or instrument issue.  The problem appeared to be a network connection issue at the Emergency MOC which is currently receiving data as part of a monthly test of the backup facility.

Effective 21:41 UTC the data flow from the MOC to PPS resumed. Apparently there was a major network issue on that part of the network. It has now been fixed and MOC is sending data again.


Starting at 16:33 UTC July 6 a filled log directory led to sh commands failing on redirecting logs to be created in that directory. A typo in the cleanup routine failed to clean our all the files after the normal 4 days. As a result they have been accumulating since the beginning of the mission.  It is unexpected that the sh failed when it could not redirect anymore.  

All data products that failed have been created and put in the appropriate directories. However, this will mean a failure in the data latency requirements for some of the GMI L1B and GPROF and a few combined products.


PPS is releasing version 3.70.4 of the PPS TKIO toolkit for TRMM/GPM products. This package, sample files, and the supporting documentation can be found at:

Learn more about the TKIO toolkit here:

If you have any questions please contact the PPS Helpdesk:​


Starting at 08:38 UTC PPS stopped getting data from the GPM Mission Operations Center.  Data was resumed at 17:21 UTC.  However, new GPS data was sent before older GPS data. The science data was sent out of order with the GPS data. This meant that about 125 mins of 1B and 1C GMI data had no geolocation and perhaps more after this had questionable geolocation. The same issues obviously also affected the radar and combined NRT which are just missing for the period between 8:30 UTC and 17:30 UTC.

All of these issues impacted the early version of the IMERG data. The late product will also be affected when its latency reaches the affected period without combined data.

You should use GPM data from the affected period with caution.


NOAA has reprocessed the global IR data for 10 UTC 26 April
through 14 UTC 27 April due to dropped images, and all 3B41RT and
3B42RT files for this time period have been reprocessed by PPS and are
now available:

   3B41RT.2015042610.7.bin.gz through 3B41RT.2015042714.7.bin.gz
   3B42RT.2015042612.7.bin.gz through 3B42RT.2015042715.7.bin.gz

Such partial dropouts in the IR data result in somewhat lower quality for IMERG Early and Late Runs, but are not cause for reprocessing. 

On  Sunday, April 26, 2015, between the hours of 12 noon (17 UTC) and 12 midnight EDT (05 UTC April 27) , changes will be implemented to NASA’s Internet access.  The purpose of this outage is to complete the Corporate Route Symmetry Project which is being implemented by the Communications Services Office (CSO).   As a result of these changes, users can expect an outage to the below services during this time period. 

Services Affected:

On  Sunday, April 26, 2015, changes to NASA’s Internet Access will have the
following impacts:

  • Internet access to/from all NASA networks
  • External Virtual Private Network (VPN) access into NASA
  • Internet access to NASA hosted public websites
  • Email to/from external locations (pps-mail) 
  • Web and mobile access to NOMAD email  ( mail)

As a result there will be disruptions to the generation of GPM and TRMM data products that will extend beyond the actual outage period. More information will be provided as it becomes available.


The issues with NOAA's 4-km Merged IR data are closed and the IMERG Early and Late Runs have been restarted from the point at which they stopped.  This will provide a continuous record for each, but it also means that it will take a while to process the backlog of data and catch up to the nominal latency. 


Due to an outage of the input 4-km IR data, the IMERG early and late runs began failing to execute on the April 14. Because of the loss of NOAA hourly IR data, PPS has had to shut off the production of NRT early and late IMERG production.  We have received no valid IR data since April 14 17:00 UTC and no IR data at all since April 15 09:00 UTC.

The software is able to deal with bad data by skipping it but it is currently not configured to handle the situation of not receiving any data at all.

We have received information that there are product problems at NOAA but have not received any information as to when the data will resume.


June 16, 2015, Update: The Tropical Rainfall Measuring Mission (TRMM) 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). The U.S. Space Surveillance Network, operated by the Defense Department's JSpOC, had been closely monitoring TRMM’s descent since the mission was ended in April. Most of the spacecraft was expected to burn up in the atmosphere during its uncontrolled re-entry. Learn more.


Frequently Asked Questions: TRMM Spacecraft Re-Entry

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.


When will the TRMM spacecraft re-enter the atmosphere and burn up?

The spacecraft is estimated to reenter the atmosphere and largely burn up in mid-June 2015. It is not possible to predict in advance the exact time when re-entry will occur.


What risks are there to people and property from falling pieces of TRMM?

There is a very low risk to people and property from pieces of TRMM that reach Earth’s surface. Most of the spacecraft will burn up in the atmosphere during re-entry. Of the spacecraft's total mass (about 5,800 lbs.), 96 percent will never reach Earth. The chance that a piece of the spacecraft will strike a person is approximately 1 in 4,200.


Where will any remains of TRMM likely reach Earth's surface?

TRMM circles the Earth between the subtropical latitudes of both the northern and southern hemispheres. Due to natural variations in the near-Earth environment, a precise location of where spacecraft debris will re-enter cannot be forecast. The U.S. Space Surveillance Network, operated by the Department of Defense U.S. Strategic Command’s Joint Space Operations Center, will closely monitor the orbit of TRMM debris during its final days and issue periodic predictions of re-entry time and location.


How many NASA satellites, launch vehicles, and other large orbital debris re-enter Earth's atmosphere each year?

In recent years the number has been about half a dozen.


How many of these re-entries have resulted in confirmed personal injury or major property damage?

Since the beginning of the space age in the 1950s, there has been no confirmed report of an injury resulting from re-entering space objects.


Will some of the TRMM spacecraft remain in orbit to contribute to orbital debris?

No. After the TRMM spacecraft has re-entered, there will not be any components remaining on orbit to contribute to orbital debris.


When was the last time that a NASA science satellite re-entered Earth's atmosphere?

The Upper Atmosphere Research Satellite (UARS) re-entered in September 2011. UARS was a much larger satellite than TRMM – the size of a bus rather than an SUV. NASA received no reports of debris.


Who should be called if someone suspects they found space debris?

They should call their local authorities. The pieces of TRMM expected to survive re-entry are made of titanium or stainless steel.  Although these materials are not toxic, they could have sharp edges and should not be touched or handled by private individuals.


NASA Office of Communications
J.D. Harrington