For the Safety Navigation In Japanese Coastal Waters page 9/120

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概要：
- 5 -2. GaleThe following items can be pointed out for factors which bring about gale in Japanese coastalwaters.・ Winter monsoon・ Cyclone passing through the southern shores of Japan (The atmospheri....

- 5 -2. GaleThe following items can be pointed out for factors which bring about gale in Japanese coastalwaters.・ Winter monsoon・ Cyclone passing through the southern shores of Japan (The atmospheric depression whichdevelops near Taiwan towards the end of winter and visits the southern shores of Japancausing snowfalls.)・ Cyclone following the Japan Sea course (Spring storm)・ Twin cyclones・ Typhoon(1) Winter monsoonAs shown in Fig. 1-4, it occurs at the time of pressure distribution where there is a continentalanticyclone in the west and a deepened cyclone in the Kurilian districts in the east. Outbreak of themonsoon becomes extremely strong in cases where central pressure of the central anticyclone exceeded1,050 hPa. In such case, northwardly gale of more than 30 m/s sometimes blow.Fig. 1-4 Winter monsoon(2) Cyclone passing through the southern shores of JapanCyclone which occurred on the northeast shores of Taiwan develops quickly in most cases.Since central pressure may fall in some cases as much as 10 hPa or 20 hPa for 24 hours,leading to increase in the speed, special care should be given to it. (Fig. 1-5)This cyclone develops quickly extending of Shikoku and Kanto, resulting in such a speed asabout 60 Km per hour. Special care should be given to the case where central pressure offKanto dipped below 990 hPa. The reason is that it may develop further and advance as far as