Abstract
This paper is prepared for giving climatological information on hail occurrence in Japan. It is pointed out that there are two kinds of maxima in the distribution of the number of hail days in Japan. The maxima along the coast of the Sea of Japan are attributed to hailstorms mostly occurring in the cold season, (October-March), Whereas inland maxima are mostly due to hail in the warm season (April-September). Observational records of 4 selected weatherstations, 2 in one of the west coast maxima and 2 in one of the inland maxima, are examined in detail. It is found that cold season hail occurrence shows practically no diurnal variation, but warm season hailstorms occur mostly in the afternoon through the evening hours. Warm season hailstorms are almost always associated with thunderstorms, but there are many cases of hailstorms without thunderstorm in the cold season. Some other features of interest on hail in Japan are also described.
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