J4 ›› 2007, Vol. 25 ›› Issue (3): 54-60.

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Diagnostic Analysis of an Abrupt Severe Convective Storm Occured on Gannan Pla teau

WANG J ianbing, WANG Zhenguo, L IXiaoyuan, WANG Zhigui, ZHANG Shengzhi   

  1. Gannan M eteorological B ureau of Gansu Province, Hezuo 747000, China
  • Received:2006-12-04 Revised:2007-07-25 Online:2007-09-30 Published:2007-09-30

甘南高原一次突发性强对流天气的诊断分析

王建兵,王振国,李晓媛,汪治桂,张胜智   

  1. 甘肃省甘南州气象局,甘肃 合作 747000
  • 作者简介:王建兵(1968 - ) ,男,甘肃甘谷人,工程师,主要从事天气预报、气候研究.
  • 基金资助:

    甘肃省气象局“西北地区防雹消雹技术在甘南州冰雹、雷暴短时临近预报预警中的应用推广研究(2007 - 07) ”课题资助
     

Abstract:

An abrup t severe storm occurred on August 30 - 31 of 2006 in the Gannan Plateau was analyzed. Results show that the combination of convective clouds from the southeast of Qinghai and the local convective cloud ismain cause resulting in this p rocess, and the severe storm and hail occurred on the front of right side of the convective cloud. The development of airflow leaning east at the height of 600 - 700 hPa over the eastern part of Gannan p lateau is very important to the severe storm’s occurring and develop ing. The distributions ofθse high energy center at 700 hPa level,θse departure between 500 hPa and 700 hPa, the helicity and vapor flux divergency fields at 700 hPa level are meaningful to estimate the occurring region of this severe storm.

Key words: severe storm, cause of formation, diagnostic analysis

摘要:

对发生在甘南高原的一次突发性强对流天气的诊断分析发现:高原上对流云团发展东移与本地发展的对流云团合并加强是造成这次强对流天气的主要原因;强雷雨和冰雹出现的位置在对流云团的右前侧; 600~700 hPa上高原东部偏东气流的发展对这次强对流天气的发生、发展有重要作用;700 hPaθse高能中心、Δθse (500 - 700)不稳定区分布、700 hPa螺旋度及700 hPa水汽通量散度的分布对这次强对流天气的落区有很好的指示意义。

关键词: 强对流天气, 成因, 诊断分析

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