1994年2月22日の低気圧による北日本の強風災害について

Abstract

On February 22, 1994 a strong extratropical cyclone passed over the Pacific Ocean along the east coast of Tohoku and Hokkaido districts of Japan. During the passage of this cyclone, three accidents were caused in transport facilities by high winds. A field survey as conducted just after the accidents to collect data of the accidents and of weather conditions. These data were analyzed to deduce the wind speed at the site of accident. Two wind tunnel experiments were performed associated with the accident of JR Nemuro line.It is revealed that the critical wind speed to cause the derailment of the train is lower than expected when the wind blows diagonally to the train. By the inspection of surface weather charts it was revealed that the high wind aera distributed widely around the center of the extratropical cyclone.