JMA system


5 March 2019:

  • The assimilation of the ATMS (Advanced Technology Microwave Sounder) and CrIS (Cross-track Infrared Sounder) data from NOAA-20 into the JMA’s Global NWP system was started at 00UTC on 5 March 2019.  The data was also started to be assimilated into the JMA’s Global EPS by the Local Ensemble Transform Kalman Filter (LETKF) to generate initial perturbations.
  • The initial perturbations made by LETKF in the JMA’s Global EPS was upgraded at 00UTC on 5 March 2019 as follows:
    — using the 6 hour forecast perturbations from the previous LETKF analysis ensemble
    — tuning of the horizontal and vertical localization functions in the LETKF.

18 October 2018:

JMA enhanced the usage of the clear-sky radiance (CSR) data from geostationary satellites (i.e. Himawari-8, Meteosat-8, 11 and GOES-15) in JMA’s global NWP system at 00 UTC on 18 October 2018.  In detail, there were two major updates:
(1) JMA began assimilating surface-sensitive CSR data from Himawari-8 Band 9 and 10 and Meteosat-8, 11 Channel 6.
(2) JMA began assimilating hourly CSR data from Meteosat-8, 11 and GOES-15 by stopping thinning data every two hours. (Note: Hourly CSR data from Himawari-8 have been already used since March 2016.)
The amount of CSR data assimilated into the JMA’s global NWP system became about double by these updates.

5 June 2018: 

JMA began the operation of a new supercomputer system.         See  for details