一次罕见冰雹天气过程的对流参数分析

USING CONVECTION PARAMETERS TO ANALYZE A PECULIAR HAIL WEATHER PROCESS

2005年6月14夜到15日凌晨受中尺度对流系统(MCS)影响,安徽东部出现罕见的冰雹天气过程。本文利用地面观测资料、高空天气图、卫星云图和雷达等资料,分析了环流形势和天气影响系统,计算了相关的强对流天气参数并对能量参数进行了详细分析,试图揭示本次过程的天气系统特征和对流参数物理特征。结果表明:此次大范围风雹强对流天气系统是在东北低涡下,高空前倾槽与地面辐合线有利的大环流背景下,一个MCS影响所致;KI、SI指数对于预示本次强风雹过程存在着一定的局限性;CAPE、NCAPE、SSI和SHR等参数较好地反映出强风雹天气过程的出现。

Under the influence of the MCS,peculiar hail weather process occurred in the east of Anhui province from the night of June 14 to the dawn of June 15 of 2005. This issue analyzes the circumfluent field and weather impact system with the data such as surface observations, upper-air observations, satellite imagery,Doppler radar. We calculate the correlative parameters of strong convection weather and analyze the energy parameters in detail, intending to reveal the characters of the weather system and the physical characters of the convection parameters. The result of our study indicates that firstly this large area windhail strong convection weather system was aroused by one MCS,controlled by the northeast low vorticity, under the advantageous background of upper-air pitch trough along with surface convergence line. Secondly KI,SI indexes have some limitation to forecast this strong wind-hail process. Besides, CAPE, NCAPE, SSI and SRH parameters can reflect the appearance of the strong wind-hail process well.