Abstract
The interest of this study is twofold for a thunderstorm occurred in Tohoku district of Japan. The one is to investigate kinematic features of a multi-cellular line associated with heavy rainfall. Dual-Doppler radar data by 3-cm wavelength research radar are used. The 3-D wind fields derived from dual-Doppler analysis indicate that the pronounced low-level convergence coincident with the upward air motion is consistent with the formation of the line.An extended version of the Volume Velocity Processing (EVVP) is proposed for single-Doppler retrieval of horizontal wind field. The results of application demonstrate that there is a discrepancy of scales between dual-Doppler derived wind field and EVVP-derived one. Overall, some improvements involved in the EVVP method could provide reliable estimation even when actual wind field is more complicated than the model of wind field.
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