Abstract
At noon of April 20, 2006, wind disaster occurred in Fujisawa City, Kanagawa Prefecture. We surveyed the characteristics of this disaster during two days. Damage to over 40 residential buildings was observed and damage area extended a line of 2 km by 50 m. According to the feature of damage, we presumed that Fujita-Pearson-scale (FPP-scale) was F0-P1-P1. The reasons why the gust in the area was a tornado were as follows. 1) The damaged area lies in a narrow line. 2) Indication of rotatory (cyclonic) wind was observed. 3) The vortex with 2 km in diameter (misocyclone) was observed by a Doppler radar. 4) Pressure drop of 1.5 hPa was recorded near the damage area. The wind disaster in Fujisawa was caused by a tornado, which formed in a narrow cold frontal rainband.
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