GPM content

GPM NRT IMERG conversion to V06 and Extended downtime

On 1 May 2019, at approximately 14 UTC, PPS will stop production of IMERG V05 in order to setup and install the new IMERG V06 code for production of early and late products. This will require an extended period when no IMERG products will be produced or available for users. We estimate an extended period of IMERG unavailability that may last for 5 hours or more. Upon resumption of IMERG production, V06 will start with data from 1 May 2019 hour 00 UTC. We will reestablish latency of early products to 4 hours, and late products to 14 hours, as soon as possible. We will also start V06 retro-processing of IMERG early and late products back to the beginning of the GPM mission. These will be available on the server as they are produced.

PPS Announcing GPM 1AGM Version Update from V05A to V05B

PPS will be updating GPM 1AGMI data from V05A to V05B today, Thursday May 09, 2019 because there was a minor bug in the algorithm. Only 1AGMI will change versions. The L1AGMI executable was previously not filling in a missing scan if there was an error in reading or processing the scan data from the instrument. Nothing was being generated in the GMI 1A product in this case. The bug fix was to fill in a missing scan and annotate this in the file header. +-------+----------------+---------------------+-------+ | AlgId | ProductVersion | StopTime | SeqNo | +-------+----------------+--------------

Change in Early and Late IMERG Product Version

A damaged land/ocean mask file (specifically, a several-gridbox shift to the east and south) has been discovered in IMERG V06A, which causes mis-identification of surface type along coasts in the Kalman filter computation. While simple to correct, the change in the IMERG results requires shifting to a new sub-version. As of May 22, the Early and Late Run files have the corrected land/ocean mask file and are labelled V06B. The adjustment will be seen in the Early and Late data files starting June 1, when the next Kalman statistics are computed. Final Run retrospective processing for V06B will

Retraction of IMERG Final V06A and V06B Processing

All IMERG V06A Final products will be retracted later today. On Wednesday, June 5, PPS will start the V06B reprocessing beginning with the GPM era, June 2014 - current available data. Once the GPM era is completed, PPS will start the TRMM-era, June 2000 - May 2014. Due to capacity loads at PPS, there are no firm estimates as to how long this will take. V06A is being retracted due to a corrupt surface coverage file in the Kalman statistics computation.

PPS will Reprocess IMERG Data as IMERG V06B Starting June 05, 2019 Due to an Algorithm Correction

Due to a correction to the GPM IMERG algorithm implemented by the GPM science team, PPS will retract and reprocess all IMERG V06A Final Run GPM and TRMM era data including GIS products as IMERG V06B starting on June 05, 2019. If you have downloaded IMERG V06A Data previously, please discard this data and use the improved IMERG V06B products as they are produced and archived. A damaged land/ocean mask file (specifically, a several-gridbox shift to the east and south) was discovered in IMERG V06A,which causes mis-identification of surface type along coasts in theKalman filter computation. While

Interruption of NOAA Products

Effective around 12:00 UTC 10 June the MHS and ATMS input to real-time IMERG suddenly became unavailable due to an unexpected change in NOAA protocols. While PPS scrambles to remedy the issue, the data content of the Early and Late Runs may be reduced for the next several days, meaning lower Quality Index due to longer morphing of microwave estimates and greater contributions by IR.

IMERG Processing and Availability

On 16 June 2019 at 22 UTC several hours of missing IR data and subsequent handling of this outage caused IMERG early and late products to be produced without IR data since that date/time. To ensure consistent early and late IMERG products it was decided to retroprocess these IMERG early and late products. All early and late IMERG products from 16 June 2019 at 22:00 UTC through June 19 were retroprocessed. You may wish to download the revised products from 16 June 2019 22:00 UTC onword. IMERG early and late are being produced again at their required latency: a. early: approx 4 hours from data collection b. late: approx 14 hours from data collection We are sorry for the extended unavailability of the products.

IMERG V06B GPM Retrospective Processing Completed

PPS has completed the retrospective processing of IMERG NRT early and late products to version V06B. All GPM NRT IMERG is available at version V06B from June 2014 through the current IMERG data. The GPM NRT IMERG from March 2014 through May 2014 will be available once the TRMM era (2000-2014) retrospective processing is completed. THe V06B data is the default product (early and late) available on the NRT file server. Please contact us for any questions.

TRMM era IMERG Completed & End of FTP at PPS

IMERG is now available back to June 2000 of the TRMM era. Both the 'early' and the 'late' products have been retrospectively processed. These products are available in the same location on the FTP server as the current GPM IMERG products: /NRTPUB/imerg/early/YYYYMM and /NRTPUB/imerg/late/YYYYMM. We are in the process of retrospectively processing the GIS-friendly versions and accumulations of these IMERG products. This is likely to be completed by the end of September 2019. **IMPORTANT** A very important item is that we have been directed to eliminate ftp to all

TMPA End of Production

The combined TRMM and GPM-era (June 2000 – present) IMERG V06B products are now available. This includes the Final product, as well as the retrospectively reprocessed Early and Late products. These products are staged in the standard locations. If you have any questions regarding accessibility please contact us. As the long-record IMERG products are now available, the TMPA and TMPA-RT products have a planned end date of December 31, 2019. Users should transition to IMERG during this period. We are hopeful we can extend the IMERG record back to January 1998 in the near future. As always, we are