IMERG totals from twin cyclones in the Indian Ocean
Over the past several days, a relatively rare event occurred in the eastern Indian Ocean: the formation of “twin” tropical cyclones. Tropical Cylones Karim and Asani formed at nearly the exact same time (06:00 UTC and 06:30 UTC, 12:00 pm and 12:30 pm local time) on May 7 on opposite sides of the Equator. Karim officially formed first in the southern hemisphere (SH) followed immediately by Asani in the northern hemisphere (NH). At first glance, the cyclones appear to be mirror images of one another with Asani rotating counterclockwise in the NH and Karim rotating clockwise in the SH roughly

Upgrade to IMERG Early and Late Runs

The upgrade of GPROF and the Combined Radar-Radiometer Algorithm (CORRA) code to Version 07 as of 0 UTC on May 9, 2022, while IMERG continues at V06 until August, requires the Early and Late Runs to change slightly and be given the version number 06C. Specifically, the V07 GPROF and CORRA data must be used in V06 IMERG, and the GPCP climatological calibration has been recomputed to account for the change in CORRA. In addition, the GMI-other sensor calibrations will shift over the next month as V07 data are incorporated into the accumulation files. We expect the Early and Late time series to be
IMERG rainfall totals in South Africa, April 5 - 18, 2022.
An upper-level area of low pressure tapped into the warm waters of the South Indian Ocean to bring heavy rains and flooding to parts of South Africa during the second week of April. The event unfolded when an upper-level trough of low pressure embedded within the midlatitude westerlies traversed the southern part of Africa from west to east. As the trough approached the east coast of South Africa, an area of low pressure became detached from the main flow, this “cut off” low then drifted over the warm waters of the Agulhas Current, which channels warmer waters from the tropical Indian Ocean

GPM V07 Update for Radiometer IC, GPROF and Combined

Effective on May 9, 2022, the GPM near real-time (NRT) algorithm will convert to V07. There are substantial format changes in the combined and GPROF products for all radiometers. The 1C product has some additions to the swath information. Depending upon how you read the 1C files, you may or may not have to make changes in your programs. Please click here for the GPM V07 file specification document, where all the format changes and their meaning are described. For those using GPROF and combined products, please read the file specifications. There were no calibration changes in GMI, but SSMIS 1C

GPM Satellite Data Outages During 23-24 March 2022

A mis-set error counter on the Core Observatory provoked a safe hold at 13:31:29 UTC on 23 March 2022, shutting down DPR and GMI observations. DPR and GMI were restored at 10:54 and 14:54 UTC, respectively on 24 March 2022. No data were recoverable from the outage period, although IMERG Early and Late continued to be produced (without GMI input, of course). The same will be true for the Final Run when it is produced. An outage at FNMOC prevented transmission of DMSP (SSMIS) from 15:51 UTC 23 March 23 to 00:47 UTC 24 March 2022. Gaps in the data are: F16: 14:34:07-19:29:39, F17: 14:56:24-19:46