Environmental analysis on the first documented tornado outbreak in China

Abstract This study presents an analysis on the storm environmental features during first recorded tornado outbreak in modern history of China August 13–14, 2018. Eleven reported tornadoes were spawned within a 20‐hr period by Typhoon Yagi (1814) its dissipating stage after landfall. They primarily formed when was at relatively weak intensity. Six generated that had lost intensity as tropical depression. These mainly located northeast quadrant with respect to typhoon center. Specifically, they concentrated overlapping region large relative helicity (SRH) and entraining convective available potential energy (E‐CAPE) considers effects air entrainment. The intrusion midlevel dry responsible for spatial pattern large‐value E‐CAPE. Special focus further put into dynamical diagnosis cause maxima SRH distributed Yagi's sector. On cylindrical coordinates, characterized strongest upward increase radial velocity layer 950–700 hPa, which resulted from interaction between circulation subtropical high trough. resultant in‐up‐out wind profile contributed quadrant. In lowest 50 hPa layer, owed tangential associated vortex. diagnoses atmospheric environment this case may provide additional benefit assessing risk landfalling cyclones China.