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15 November 2019
Issue with updating of metafiles for JRA-55 data visualization
11 October 2018
Replacement of the missing data in the JRA-55 product
JRA-55 Product Users' Handbooks are updated.
2 October 2018
Partially missing data in the JRA-55 product
8 December 2017
Due to restrictions of the storage resources, the directories for the period from January 1971 to September 1980 (for all categories) will be moved.
  • Following this move, a switch of the symbolic links under the JRA-55/Hist/Daily directory will take place on 11 December 2017, 04-06 UTC.
  • Please be informed that the symbolic links to the directories for the aforementioned period will be temporarily disconnected during this switch.
25 October 2017
Provision of the model grid isentropic analysis fields (anl_isentrop) for the past period (1958-2016) from the JMA Data Dissemination System (JDDS) will be terminated as of the end of October 2017.
  • Due to restrictions of the storage resources, provision of the above data from JDDS will be terminated.
  • The above data at DIAS and NCAR will remain available, and can be downloaded from these collaborative organizations as ever.
18 July 2017
Official English website for Dynamical Regional Downscaling Using the JRA-55 Reanalysis (DSJRA-55) launched.
28 July 2016
Impact of snow depth analysis bugs on the JRA-55 product for the period from 2015 to 2016
02 July 2016
The JRA-55 comprehensive report II (Harada et al. 2016) has been published in JMSJ volume 94, No.3, 269-302.
18 May 2016
Impact of snow depth analysis bugs on the JRA-55 product
25 February 2016
The JRA-55 comprehensive report II (Harada et al. 2016) has been released as EOR of JMSJ.
The JRA-55 evaluation paper (Kobayashi and Iwasaki 2016) has been released as EOR of JGR.
24 February 2016
A compilation of climate maps produced with JRA-55 (The JRA-55 Atlas) is released.
18 December 2015
Bugs in JRA-55 snow depth analysis (updated)
15 October 2015
The JRA-55 manuals (1.25-degree latitude/longitude grid data and model grid data (TL319L60)) are updated to add notes on cloud work function and upward mass flux on cloud base.
21 July 2015
Dataset of JRA-55C, an atmospheric reanalysis assimilating conventional observations only, become available on NCAR.
12 June 2015
Dataset of JRA-55AMIP, JRA-55 AMIP-type simulation, become available on DIAS.
22 May 2015
The JRA-55 manual 1.25-degree latitude/longitude grid data is updated.
The JRA-55 manual model grid data (TL319L60) is updated.
18 March 2015
The JRA-55 comprehensive report (Kobayashi et al. 2015) has been published in JMSJ volume 93, No.1, 5-48.
05 February 2015
Dataset of JRA-55C, an atmospheric reanalysis assimilating conventional observations only, become available on DIAS.
17 November 2014
JRA-55 leaflet is released.
29 September 2014
The JRA-55 comprehensive report (Kobayashi et al. 2015) has been accepted on 18th September 2014 for an article for publications in JMSJ volume 93, No.1.
Early Online Release of the article has been uploaded
06 June 2014
The JRA-55 manual 1.25-degree latitude/longitude grid data is updated.
The JRA-55 manual model grid data (TL319L60) is updated.
10 March 2014
The JRA-55 manual 1.25-degree latitude/longitude grid data is updated.
The JRA-55 manual model grid data (TL319L60) is released.
The JRA-55 model grid data (TL319L60) distribution has been started.
29 January 2014
Near-real-time JRA-55 latitude/longitude gridded data distribution begins.
JRA-55 latitude/longitude gridded data (2013) distribution begins.
25 December 2013
Release schedule for JRA-55 data and plan for JRA-25/JCDAS data provision phase-out (changed)
24 December 2013
JRA-55 daily latitude/longitude gridded data (1958 to 1978) distribution begins.
27 November 2013
JRA-55 daily latitude/longitude gridded data (1979 to 1995) distribution begins.
30 October 2013
JRA-55 daily latitude/longitude gridded data (1996 to 2012) distribution begins.
1 October 2013
JRA-55 monthly latitude/longitude gridded data distribution begins.
30 September 2013
Release schedule for JRA-55 data and plan for JRA-25/JCDAS data provision phase-out
Launch of JRA-55 website.