Analysis of Evolution Characteristics of a Coastal Supercell Storm Based on Dual Radar Wind Field Inversion

Abstract

Utilizing data from ground-based encrypted automatic stations, EC reanalysis datasets, and radar observations from Qingdao and Weifang, this study conducts an intricate analysis of the morphological evolution of a supercell storm structure in the coastal region of Qingdao on June 13, 2018. The methodology employed encompasses the application of dual radar wind field inversion techniques to delineate the dynamic progression of the storm. The findings reveal that the inflow jet positioned at the rear of the supercell induces the concurrent formation of anticyclonic and cyclonic vortex pairs to the south and north flanks of the storm system, respectively. Notably, the vigorous intensification of the cyclonic vortices augments the low-level atmospheric convergence. This enhancement is conducive to the facilitation of robust upward vertical motions, thereby leading to a marked elevation in the vertical stretching term. Concurrently, the amplification of the cyclonic vorticity fortifies the rear inflow jet itself. Upon the rear inflow jet's advancement to the front side of the supercell, it engages in a dynamic interaction with the ambient easterly winds. This interaction precipitates the genesis of a nascent convective cell at the juncture characterized by the storm bow's protrusion, culminating in a transformative alteration in the supercell's morphology. In a sequential pattern, an anticyclonic storm initially exhibits a diminution in the upper atmospheric strata, subsequently extending its influence downward. The inception of the new convective cell on the front side of the supercell is notably instigated in the middle layer.