Mesoscale Filtering Analysis of a Regional Heavy Rain by Southwest Vortex

  • ZHANG Hong ,
  • LI Guoping ,
  • WANG Shudong
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  • College of Atmospheric Sciences, Chengdu University of Information Technology, Sichuan 610225, China;2. Chongqing Meteorological Observatory, Chongqing 401147,China;3. Meteorological Observation Center,China Meteorological Administration, Beijing 100081,China

Received date: 2012-07-13

  Online published: 2014-04-28

Abstract

By programming a Barnes band-pass filter through conventional data and NCEP data,the mesoscale filtering analysis of a regional heavy rainfall process produced by the Southwest Vortex(SWV) on 14-18 July 2010 and 3-5 July 2012 were done. The case study shows that Barnes band-pass filter could find out the mesoscale weather systems including SWV by choosing the appropriate filter parameters. After filtering and analyzing mesoscale characteristics of stream line, the SWV has four stages:generation,development,disintegration and movement eastward. The mesoscale filtering can better depict the mesoscale circulation characteristics in Southwest regions. The calculating helicity of the filtered data show that the high value of the helicity is conductive to the generation and development of the convective system,as well as vortex.The clearly distribution of positive and negative centers of the filtered local vertical helicity can better reflect prepetition. The rain area occurs in the east of the large gradient values between positive and negative centers of local vertical helicity. Not only local vertical helicity but also integral vertical helicity have a good indication significance in preparations and rainfall intensity changes.

Cite this article

ZHANG Hong , LI Guoping , WANG Shudong . Mesoscale Filtering Analysis of a Regional Heavy Rain by Southwest Vortex[J]. Plateau Meteorology, 2014 , 33(2) : 361 -371 . DOI: 10.7522/j.issn.1000-0534.2013.00016

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