Issue with tropical cyclone analysis in JRA-55

Jan. 29, 2020
Posted by: Dave Stepaniak

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JMA (Japan Meteorological Agency) has announced that some tropical cyclones occurring over the Northeast Pacific and the North Atlantic from 1959 to 1987 were erroneously represented as anti-cyclonic vortices in the Japanese 55-year Reanalysis (JRA-55) dataset. A detailed report by JMA with lists of erroneous anti-cyclonic vortices can be found in the RDA documentation for JRA-55. Please refer to the January 2020 entries at:

JRA-55 Documentation