IMERG Early Run Example January 24th, 2020

Data News

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.
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.
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...
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.
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...

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