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Surface Meso High and Wake Low Associated with Pre-Monsoon Thunderstorm Over the Kharagpur Region

  • S. Dawn
  • M. Mandal
Conference paper
Part of the Springer Atmospheric Sciences book series (SPRINGERATMO)

Abstract

Observations recorded under the national coordinated STORM (Severe Thunderstorm Observations and regional Modeling) Programme have been used to study the surface parameters associated with tropical squall line (thunderstorm) with trailing stratiform precipitation. A number of studies indicated the presence of three well known features—a pre-squall meso-low, a squall meso-high and a wake low in the surface pressure field associated with a midlatitude squall with trailing stratiform precipitation. In this paper, an attempt is made to identify these mesoscale features, if any, associated with thunderstorms over Indian region. The study is conducted over Kharagpur region, a part of the Gangetic West Bengal frequently affected by thunderstorms during the pre-monsoon season. The observations from 50 m instrumented micro-meteorological tower and upper air sounding at Kharagpur are used in the study. Doppler Weather Radar (DWR) (at Kolkata) imageries are used to identify the squall line with trailing stratiform precipitation. It is observed that in the squall line with trailing stratiform precipitation shield, the meso-high (MH) is associated with convective line and wake low (WL) exists in the rear of the storm. The position of the meso-high is typically found in the vicinity of the heavy rain directly beneath the downdraft.

Keywords

Squall Line Thunderstorm Activity Stratiform Cloud Doppler Weather Radar Stratiform Rain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors are thankful to the Department of Science and Technology (DST), Govt. of India, for organizing STORM program from which the required data were made available.

References

  1. Fujita TT (1955) Results of detailed synoptic studies of squall lines. Tellus 7:405–436. doi: 10. 1111/j.2153-3490.1955.tb01181.x CrossRefGoogle Scholar
  2. Johnson HR (2001) Surface mesohighs and mesolows. Bull Am Meteorol Soc 82:13–32. doi:10. 1175/1520-0477(2001) 082<0013:SMAM>2.3.CO;2CrossRefGoogle Scholar
  3. Zipser EJ (1969) The role of organized unsaturated convective downdrafts in the structure and rapid decay of an equatorial disturbance. J Appl Meteorol 8:799–814. doi:10.1175/1520-0450(1969) 008<0799:TROOUC>2.0.CO;2CrossRefGoogle Scholar
  4. Zipser EJ (1977) Mesoscale and convective-scale downdrafts as distinct components of squall-line structure. Mon Weather Rev 105:1568–1589. doi:10.1175/1520-0493(1977)105<1568:MACDAD>2.0.CO;2CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Centre for Oceans, Rivers, Atmosphere and Land sciencesIndian Institute of TechnologyKharagpurIndia

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