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Advances in Atmospheric Sciences

, Volume 21, Issue 6, pp 976–988 | Cite as

A diagnostic study of record heavy rain in twin cities Islāmābad-Rāwalpindi

  • Ghulam Rasul
  • Qamar-uz-Zaman Chaudhry
  • Zhao Sixiong
  • Zeng Qingcun
Article

Abstract

Using surface and NCEP reanalysis data along with radar and satellite images, diagnosis has been carried out to probe the reasons for the very heavy rainfall that occurred in Islāmābad-Rāwalpindi on 23 July 2001. It has been revealed that the sudden evolution of this meso-scale severe weather system was the direct result of strong surface convection in moist and unstable lower layers of the atmosphere. The subsequent rapid development was the combined effect of the presence of the mid latitude westerly’s trough in the north and moisture feeding through monsoon flow along the Himalayas and also the direct south-westerly current from the Arabian Sea. After the westward shifting of the Sub-Tropical High (STH) from the north of India, the strong divergence zone on its eastern edge contributed positively to the development of upward motion. Initially the convective systems moved towards the south and then southeastward following the steering current in the middle troposphere. Based on these analyses, the physical model of the sudden record heavy rainfall has been proposed and a comparison between the heavy rainfall in this case and one in China has been conducted.

Key words

monsoon circulation mesoscale systems heavy rainfall 

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Copyright information

© Advances in Atmospheric Sciences 2004

Authors and Affiliations

  • Ghulam Rasul
    • 1
    • 2
    • 3
  • Qamar-uz-Zaman Chaudhry
    • 1
  • Zhao Sixiong
    • 2
  • Zeng Qingcun
    • 2
  1. 1.Meteorological Service of PakistanIslāmābadPakistan
  2. 2.Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing
  3. 3.Graduate SchoolChinese Academy of SciencesBeijing

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