In this study, regional land-atmosphere coupled model (JSM-SiBUC) is applied to the GAME-HUBEX region to simulate the activity of the Baiu front observed on 2nd July 1998. To perform the regional 4DDA (four dimensional data assimilation) acculately, not only the used model but also the external dataset is very important. The main target of this study is to investigate the accuracy of the external dataset to be used for the regional 4DDA in future. Three dataset-GANAL, GAME-Reanalysis Verl.1 and Ver 1.5, which were produced by JMA (Japan Meteorolocal Agency)-are used for initial and external boundary condition. Through the comparison with upper air sounding data, raingauge data, and cloud image from GMS, the following results were obtained. 1) lower level specific humidity of GAME-Reanalysis data is smaller than observed one. 2) lower level potential temperature of GANAL data is larger than observed one. 3) due to high temperature in the GANAL data, it is difficult to simulate the meso-vortex observed on 2nd July 1998. 4) due to low humidity in the GAME-Reanalysis data, it is more difficult to simulate the above case.
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