Change of the model version to GEPS2103 has applied to the real-time forecasts since the 30th March 2021. The new JMA real-time ensemble system includes 2 start dates (Tuesdays and Wednesdays at 12Z) instead of the previous 4 runs. The ensemble size is 25 members for both days and the resulting new lagged ensemble for S2S is a single 50-member ensemble starting on Wednesdays at 12Z. The new set of the fixed reforecasts (1981-2020) will be archived later during 2021. More information can be found in the pages JMA Model#JGEPS2103 and JMA Model Description GEPS2103. |