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《Guangdong Meteorology》 2017-03
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Analysis of the Causation and Pre-warning of a Squall in Guangdong

ZHI Jiang-ling;MAI Xue-hu;HUANG Xian-xiang;Meteorological Bureau of Foshan City;Foshan Center of Tornado Research;  
With the NCEP/NCAR 1° × 1° reanalysis,Doppler weather radars and automatic weather stations across Guangdong,we analyzed a squall weather process that happened in the province on April 13,2016. The result is shown as follows. The squall was strong,lasted long and brought about great damage. In the early part of the process,there was obvious warm advection at the low level of the troposphere and cold advection at the middle and high level,advancing the formation and development of unstable atmospheric stratification over the region. Due to enhanced mid-level westerlies and downward transportation of momentum,a strong vertical wind shear occurred,being favorable for the organization and extended maintenance and development of the storm. During the movement and development of the squall,a corresponding well-cut convergence line appeared in the surface wind field,which played an important role in triggering and keeping the squall. As shown in radar echo analysis,the squall had well-defined characteristics of arc-shaped echo that moved fast. Large gradients of reflectivity factor,elevated height of the mass core of strong echo and its rapid decrease in altitude,strong rear-portion inflow and mid-level radial convergence are good indicators for the gale. The dragging effect of precipitating particles and rapid movement of the squall contributed in some way to the formation and enhancement of the surface gale.
【Fund】: 佛山市气象局科技项目(201501);佛山市气象局科技项目(201603)
【CateGory Index】: P458.123
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