Characteristics of misocyclones causing tornado disasters observed by a radar

Abstract

The present study aims to revise hazardous wind watch issued by JMA. We analyzed the characterictics of misocyclones in clouds observed by Muroto Doppler radar from 2008 to 2013 and compared between tornadic and nontornadic misocyclones. We detected 50 misocyclones. 80% of them were borned offshore and 33 vortices landed. All tornadic misocyclones also were borned offshore and then landed. The lead time until landfall was more than 10 minutes. The tornadic misocyclones also have the tendency to grow up higher. The hazardous wind watch can be revised based on the knowledge of these characteristics.