Abstract
A remarkable regionality in snow damages was seen during the heavy snowfall event that occurred in the Kanto-Koshin district on February 14-15, 2014. Since the areal differences in the predominant precipitation type may be related to this regionality, the estimates of the precipitation type （dry snowfall, wet snowfall, rain） in the Kanto-Koshin district were made at hourly intervals using AMeDAS data. Consequently, it was estimated that snowfall on February 14 was dry in most of the districts, and that wet snowfall and rain appeared to a limited extent on the Pacific coast and Boso Peninsula. The data show that wet snowfall and rain gradually spread from east （Chiba and Ibaraki Prefectures） to west during the morning of February 15. The quantitatively predominant precipitation type was dry snowfall in the Nagano, Yamanashi, and Gunma Prefectures, dry and wet snowfall in the Tokyo metropolitan area, wet snowfall in the Kanagawa, Saitama, and Tochigi Prefectures, and wet snowfall and rain in the Chiba and Ibaraki Prefectures. Considering the relationship between snow damage and predominant precipitation type, the ratio of dry precipitation to total precipitation during the February 14-15 snowfall event was found to depend on the type of snow damage.
