For the Safety Navigation In Japanese Coastal Waters page 11/120

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- 7 -(3) Cyclone following the Japan Sea course (Spring storm)When a distribution of atmospheric pressure for winter in which the high pressure area liesto the west and the low pressure area lies to t....

- 7 -(3) Cyclone following the Japan Sea course (Spring storm)When a distribution of atmospheric pressure for winter in which the high pressure area liesto the west and the low pressure area lies to the east, abates and a low pressure troughapproaches from the continent, it is sometimes possible that cyclone will occur on the EasternChina Sea or the Yellow Sea, enter the Japan Sea and deepen quickly. In such a case, asoutherly gale rages throughout Japan. (Fig. 1-7)Fig. 1-7 Cyclone following the Japan Sea course (Spring storm)(4) Twin cyclone (Futatsudama Teikiatsu)When cyclone which occurred in the vicinity of the Yellow Sea enters the Japan Sea anddevelops quickly, while at the same time cyclone which occurred in China or the Eastern ChinaSea, developing, moves eastward on the southern shores of Japan, it is called FutatsudamaTeikiatsu. It comes together, however, off the coast of Sanriku and deepens so much on theeastern shores of Hokkaido that it may frequently reach the same level as typhoon. (Fig. 1-8)Fig. 1-8 Twin cyclone (Futatsudama Teikiatsu)