Data

Regions of unrealistically high values appeared in the IMERG Early and Late files starting around 00:00 UTC on 17 October 2024. Upon investigation, GPM scientists detected an operational problem on the GPM Core Observatory around 15 October 2024 that caused some corrupted CORRA data to be added to the CORRA-GMI calibration accumulator files for the IMERG Early and Late Runs. These anomalous data affected the calibration when it was next updated (on 17 October 2024). Repaired calibration files were applied at 06:00 UTC on 2 November 2024. The time spans of the unrealistic calibrations in Early

On 18 October 2024 PPS received a corrupted IR file for 15:00 UTC, which caused all subsequent IR processing to fail and not contribute to the Early Run from 16:00 UTC on 18 October until 05:00 UTC on 20 October, and to the Late Run from 16:00 UTC on 18 October until 20:00 UTC on October 19. Subsequently, PPS manually skipped past the defective IR data file and ran all the IR data that were missed, and then reran both Early and Late for the periods listed above. These rerun products have replaced the earlier products on the fileserver. Please note the out-of-order file times to confirm which

A server upgrade at the Fleet Numerical Meteorology and Oceanography Center (FNMOC) interrupted real-time transmission of Defense Meteorological Satellite Program (DMSP) data on Sept. 11, 2024, for the F16, F17, and F18 satellites at 18:28, 19:03, and 19:36 UTC, respectively. They returned to real-time operation on Sept. 18 at 23:45 UTC, and are believed to be back-filling the missed data. Thus, the IMERG Final Run products should be unaffected, but the Early and Late Run products will lack SSMIS for this period, with some variation due to latency considerations.

Recently, an error in the metadata of the GeoTIFF files for the IMERG V07B Final Run climatologies has been discovered. This error affected only the geolocation, specifically the orientation, of the fields and not the precipitation data. These files have been replaced with ones containing the correct metadata. Users who have downloaded the old GeoTIFF files should replace them with the new files. These IMERG climatology files are available at https://gpm.nasa.gov/data/imerg/precipitation-climatology

The following is a clarification on the current status of Version 06 and Version 07 IMERG data. Production of V06 Early and Late datasets ceased on 3 June. After overcoming significant hardware, software, and data feed challenges, PPS instituted “Initial Processing” (that is, processing of new data) for Early and Late starting with 00:00 UTC on 1 June. “Retrospective Processing” (that is, processing of the record of previous data) is complete for Early from June 2000 through December 2023. Retrospective Processing is on-going for Late, with parallel runs starting with June 2000 and June 2014

At 01:45 UTC 12 June, JAXA resumed their processing of GPM radar products, which allowed PPS to catch up the downstream GPM DPR products that they compute, as well as computing the Combined product. Fortunately, through the processing outage the JAXA-NASA data line continued to operate, providing the ancillary data that GPROF and IMERG needed to continue uninterrupted near real-time processing.

The PPS is now receiving AMSR2 data and JMA forecasts from JAXA, which means that GPROF and IMERG Early and Late products will continue being produced. The GPM radar and combined products are still unavailable due to the JAXA system issues. The PPS has also worked with partners at CSU to develop a new method of processing GPROF that will allow continued production even if no JMA forecast files are received, in the event of a future outage.

Due to an unexpected JAXA system failure the PPS is not receiving GPM DPR Ku and Ka L1B data as well as AMSR2 data. As a result, the PPS cannot produce the GPM radar or combined datasets. The PPS is also not receiving JMA 6 hourly forecasts, and as a result after 12:00 UTC on June 11, 2024 the PPS will not be able to produce the GPROF or IMERG products. JAXA estimates that their systems will start running again by 03:00 UTC 12 June, at which point production of the above products at the PPS will resume. Please check back here for further updates, and contact us with any questions.

The new V07B IMERG Late and Early Run products commenced processing around 1300 UTC on 6 June 2024, starting with data for 0000 UTC on 1 June 2024. It will take a number of hours for the days before 6 June to be processed, after which users should see the normal latencies of 4 and 12 hours for Early and Late, respectively. Note that the polar regions are initially largely set to "missing" in the Early Run because input data for times before 1 June that would normally be used for forward morphing are not provided as part of the startup.

Due to unforeseen issues with the recent GPM near real-time system updates, IMERG V07B Early and Late Run production has been delayed. Currently the PPS plans for IMERG V07B Early and Late Run data to begin production on June 6, 2024. GPM L1 and L2 data has already resumed production, and can be accessed on the the jsimpson and jsimpsonhttps servers.