FORMATION MECHANISM OF A NOTABLE CLOUD SYSTEM THAT CAUSES HEAVY SNOWFALL AND A TENTATIVE PREDICTION OF ITS BEHAVIOR

概要

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Most severe snowfall in Japan are associated with pressure distribution of the monsoon type. When cold monsoon bursts spread aloft over the Sea of Japan, numerous cloud streak that are aligned in parallel from the Coast of the Asian continent to the Japanese archipelago. These bursts are accompanied by a constant snowfall and local traffic problems are produced because of this consentrated snowfall. Therefore, forecasts of cloud behavior are needed. At present, such predictions have been successful to some extent. In all the especially heavy snowfall studied, a notable cloud system grew and aligned itself on an intermediate scale from the east coast of the Korean Peninsula to the west coast of the Japanese islands. This type of system produces the highest peak values for snowfalls as in the severe winter snowfalls of 1968 and 1981. To investigate the genreation mechanism of this type of cloud system, observations were made with balloons and from an aircraft. Tentative predictions of the bahavior of this monsoon type system were made.