Mr. S Balaji Kumar

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SEVERE THUDERSTORMS – OBSERVATIONAL AND REGIONAL MODELING (STORM) OVER NORTH-EASTERN REGION (NER) OF INDIA [STORM‐2010 OVER GUWAHATI] 

OBSERVATIONAL REPORT SUBMITTED TO   

  MINISTRY OF EARTH SCIENCES GOVERNMENT OF INDIA BLOCK 12, CGO COMPLEX, LODHI ROAD NEW DELHI 110003          By

Department of Physics Yogi Vemana University Vemanapuram Kadapa – 516 003 (in Collaboration with India Meteorological Department, RMC Guwahati)

ACKNOWLEDGEMENTS The technical supports extended by the India Meteorological Department (IMD) staff at Regional Meteorological Centre (RMC), Guwahati are gratefully acknowledged. We are very much indebted to Ministry of Earth Sciences (MoES), Government of India for their financial support for deployment of ground based instruments and for data collection and analysis under the Severe Thunderstorms Observations and Regional Modeling (STORM) Programme.

This field programme is implemented under the

supervision

of

Prof. U.C.Mohanty, Indian Institute of Technology, New Delhi and Dr. P.V.Joesh, Emeritus Scientist, Cochin University of Science and Technology, Cochin. We are very much thankful to them for their active support and constant encouragement for successful completion of the STROM 2010 over Guwahati in the North Eastern Region (NER) of India.

We acknowledge Mr. S.B.Surendra Prasad, Junior Research Fellow, Department of Physics, Yogi Vemana University, Kadapa for analyzing COSMIC data during STROM – 2010.

We are very much thankful to the Yogi Vemana University administrative officers and staff for their support and cooperation for timely deployment of the based meteorological sensors and implementation of the STROM 2010 in the NER of India.

Dr. K.Krishna Reddy Shri. Haragobindha Pathak Mr. S.Balaji Kumar Mr. U.V.Murali Krishna Ms. N. Lakshmi Kantham Ms. P. Sravani -

Principle Investigator Deputy Director General, IMD.RMC, Guwahati Senior Research Fellow Junior Research Fellow Junior Research Fellow Junior Research Fellow

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1. INTRODUCTION:
In India, during the pre-monsoon season of April and May over North-Eastern Region (NER) of India and Gangetic West-Bengal and also surrounding areas such as Jharkhand, Orissa, Chattisgarh, Bihar are affected by severe thunderstorms called ‘Norwesters’ that are locally called “Kal Baishaki”. Thunderstorm is a mesoscale system with space scale of a few kilometers to a couple of 100 kilometers and time scale of less than an hour to several hours characterized by heavy rain showers, lightning, thunder, hail-storms, dust-storms, surface wind squalls, down bursts and tornadoes. It is essential to understand the growth, decay process and microphysical characteristics of severe thunderstorms because they cause extensive damage to standing agriculture crops, high rise buildings as well thatched huts, high tension electric poles/wires, cause flash floods, resulting in loss of life and property. Several studies were carried out over United States of America (Brandes et al.,1995), Australia (Maki et al.,2001; Sandra et al., 2006), Europe (Roman et al., 2002), South America (Sánchez et al., 2009), and in other countries to understand major advances in continental thunderstorm dynamics, modeling, electrification and role of cloud micro-physical processes and also predict these severe storms. Kotroni et al., (1997) studied the initiation of summer thunderstorm activity over the Greek peninsula during a prevailing weak synoptic flow is investigated using the Colorado State University-Regional Atmospheric Modeling System (CSURAMS) and the Hybrid Particle and Concentration Transport Package (HYPACT). Brooks et al., (2003) have used the National Center for Atmospheric Research (NCAR)/United States National Centers for Environmental Prediction (NCEP) reanalysis system to create soundings and find environmental conditions associated with significant severe thunderstorms (hail at least 5 cm in diameter, wind gusts at least 120 km/h,...
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