At noon on April 20, 2006, a wind storm occurred in Fujisawa City, Kanagawa Prefecture, Japan with a F0-P1-P1 rank on the Fujita-Pearson-scale (FPP-scale). Damage to over 40 residential buildings was observed. The damage covered an area 2 km by 50 m. The strong winds were accompanied by the passage of a cold front. Eyewitness accounts of a dust column and the recording of a pressure drop (1.5 hPa) indicate the existence of a tornado vortex. A hook-shaped radar echo (5 km in diameter) was observed in the narrow cold frontal rainband, with strong horizontal wind shear above the damage area. The Doppler velocity pattern indicated a misocyclone, which had a diameter of 2 km and a vorticity on the order of 10 2 s 1 . The wind storm may have caused the tornado, which formed in the cold frontal wind shear zone.
, 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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