A Method of the Prediction of Five Days Amount of Snowfalls (Preliminary Report)

[摘要] 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.

[学科分类] 大气科学