ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 37 Issue 12 > 2011,37(12):1519-1525. DOI:10.7519/j.issn.1000-0526.2011.12.007 Prev Next
A Case Study on Supercell Storm of Hail in the Northwest of Guangxi
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
Based on the routine observation data and the Doppler weather radar data, the largescale hail in the northwest of Guangxi is analyzed. The results show that: (1) The systems csusing hail are upperairvortex and lowlevel shear line. Although the CAPE was moderate before the hail, it has necessary conditions for the severe convection potential occurrence such as the stratification of upper dry and lower wet, strong environmental wind shear and the strong clockwise curvature at low levels. (2) The lowlevel reflectivity on the right front of the supercell shows a typical hook echo and it is a typical feature of supercells. Along the inflow direction and through the strongest echo, the reflectivity shows typical BWER (Boundary Weak Echo Region), overhang echo and echo wall. The strongest echo is within a vertical narrow region along the echo wall and can be more than 65 dBz. The corresponding radial velocity in the lower atmosphere has a moderate mesoscale vortex street and its rotation speed can be 22 m·s-1. Meanwhile the VIL exceeds 70 kg·m-2 and its density exceeds 5 g·m-3. (3) The positive vorticity at upper levels, high CAPE value, convergence line on the ground stranding in the Youjiang Valley and the special terrain are the main causes for many convection cells moving along similar paths.
Keywords:
Project Supported:
Clc Number:
Mobile website
