Using the five days mean isobars and isallobaric charts, we have attempted to acquire a method of the prediction of five days amount of snowfall at Hokurikudistrict in winter. When the five days amount of snowfall is more than 100mm, the type of mean isobar takes a definite type, namely, the high center locate at Mongolia and its edges extend to Middle China and the isobar swells at Pohaiqulf (See Fig 1_??_7). There is no exception in this type. Then, by drawing the stream line, a distinct front is found to run along the coast of Japan sea or in Japan sea. On the isallobaric charts, except 1937, the remarkable rising area locates at the southern or middle part of the continent and the remarkable falling area near Hokkaido or Tisima. But their locations are sometimes sliped more or less. The change to a large amount-type appears when the remarkable rising area locates at the northern part of the continent (See Fig 8) and is expected to extend to south. Then, the change to a small amount-type appears when the pressure gradient becomes slow and the falling area locates at the southern part of the continent. But, in actual Base, many difficulties are experienced, namely, the characteristics of that year must be found quickly and when the temperature rises, the snow changes to rain, so that the prediction of temperature is important.
Using the mean isobar types in April, a method of the prediction of rainfall amount in Baiu season and summer temperature is studied in this paper and obtained the following results: (1) Mean isobar types were classified according to the following types of rainfall amount in Baiu season as: 50mm_??_70mm (Fig 1), 100mm_??_120mm (Fig 2), 150mm_??_175mm (Fig 3), 175mm_??_225mm (Fig 4) (mean year's-type), 225mm_??_275mm (Fig 5), nearly 300mm (Fig 6) and 350mm_??_385mm (Fig 7). Generally speaking, the rainfall amount becomes larger as the front becomes more distinct. (2) The mean summer temperature is indicated by the difference of energy between the travelling high from the continent and Ogasawara high. When the both highs are in equilibrium, the summer temperature is the same as the mean value.
At Miyazaki Prefecture, southeastern region of Kyuayu, heavy rainfalls are often experienced locally and cause vast damages. The mechanism of such a heavy rainfall is not yet made clear. In this paper, a brief investigation has been made on the cause of heavy rainfall in front of a violent typhoon passing Hyuganaaa, eastern sea off this district, and obtained the following results: (1) A cold air mass detached from the parent high pressure and traveled down to south over Kyusyu. (2) A heavy rainfall occurred in margin of this detached cold air mass and the total amount of precipitation by the passage of typhoon may be divided in two, the first by this cold air mass and the second by the passage of typhoon center.
In the present paper some investigations are made on the sea ice in the South Kurile Islands, mainly in the sea near Etorofu Island. The sea along the coast begins to freeze from the end of January, and drift ice can be seen from the middle of Eebruary. The sea ices are transported by the Okhotsk Return Current (Cold current) and the north-west monsoon, and the ice blocks appears at Saghalin, Hokkaido, and the north-eastern part of kurile Islands, in sequence. As the recurrence number of sea ice becomes large, the volumes of ice block decrease, and when the sea ice remains stagnant, the sea ice blocks are hardly melted away. Some people say that the influence of sea ice upon the elements of climate is trivial, but, in facts, the temperature is effected remarkably by it. Weather is influenced by the temperature upon the sea ices, and it seems to relate upon the stability of the weather. The sea ices have no direct relation with the sea fog and after the sea ices have melted away, it is known that regular sea fogs come. The sea fog does not appear on the sea while there are sea ices. The sea ices seem to affect directly the elements of long-range forecasting, but exactly there is no relation, because the air masses are influenced by cold sea area. There is a remarkable fact that drift ices can be seen early than usual, when it is colder than usual winter. It is a interesting fact that, as people say, the continental climate prevails when the sea ice develops on the North Okhotsk Sea.
For the purpose of forecasting the amount of snow-cover, based upon the relation between the distribution of pressure fields in the whole country and the mean temperature at Kanazawa, the distribution of pressure fields was classified into 3 types and discussed.