The current measurements have been carried out by NOWPHAS at several stations in the coastal area around Japan since 1996. In the data, temporal but simultaneous changes in residual currents were recognized at several stations in the Japan Sea side. The cause of this temporal change was deduced to be due to the strong currents caused by typhoon approach. In this study, attention was paid especially on the period of typhoon approach, and the occurrence characteristics of the strong currents in the offshore area was investigated based on the data of wind speed, the atmospheric pressure and the typhoon track provided by Japan Meteorological Agency.
As a result, it was found that typhoon approach contributes to the generation of the offshore strong current in many cases. In addition to this, it was also found that the current velocity increases in the area where wind blows for a long time in the same direction. Furthermore, it was also observed that the strong current is likely to appear at more than two stations during the typhoon.
