Inversion in the number of High Wind Thunderstorms between Kolkata of North-East India and Florida of South-East USA

By Himadri Chakrabarty and C. A. Murthy.

Published by The International Journal of Climate Change: Impacts and Responses

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Article: Electronic $US5.00

Kolkata, located on the coast of Bay of Bengal in North-East India, witnesses local severe thunderstorms associated with squalls (i.e., high wind) in every year, generally during March, April and May months. Florida, USA also experiences the same type of phenomena, generally during summer months. This article contains the results of a study on the number of occurrences of the seasonal mesoscale high wind thunderstorms in Kolkata and in Florida during the period of 38 years (1969 to 2006). Since Florida and Kolkata are situated almost longitudinally opposite to each other, it may generally be expected that the storm dataset of Kolkata may have correlation zero with that of Florida. But, it is found that (i) significantly, more than half of the counties of Florida possess negative correlation with the storm events of Kolkata, and (ii) Palm Beach, a county in Florida, bears significant negative correlation with Kolkata. Thus, inverse phenomenon (if the number of thunderstorms increases in one place, it would decrease in the other and vice versa) is found between Kolkata and Palm Beach. (iii) The number of thunderstorms in each county of Florida in 2007 is predicted by regression analysis. It is found that the actual number of thunderstorms occurred in 2007 lies in the 95% confidence interval for 85% of the considered counties. This study conclusively shows the existence of a relation between Kolkata and Florida storms.

Keywords: Mesoscale, Convective, Thunderstorm, Correlation, High wind, Regression, Testing of Hypothesis

International Journal of Climate Change: Impacts and Responses, Volume 2, Issue 1, pp.21-32. Article: Print (Spiral Bound). Article: Electronic (PDF File; 980.991KB).

Himadri Chakrabarty

Teacher Fellow, Institute of Radiophysics and Electronics, Dept. of Computer Science, Surendranath College, University of Calcutta, Kolkata, West Bengal, India

M.Sc.(Electronic Science), M.Tech.(Atmospheric Science), Ph.D.(Tech) Fellow. Having interest in the field of Climatology, General Circulation, Satellite Meteorology, Space Sciences, Application of different computational methodologies in Atmospheric feature studies such as neural network, genetic algorithm etc. Presently engaged in the research work on severe mesoscale thunderstorm studies by different techniques. The thunderstorm data from different subtropical places of the world have been collected and analysed. A relationship among them has been found. The next work is to find the influence of El Nino and La Nina on all these weather phenomena.

Dr. C. A. Murthy

Professor and Head, Machine Intelligence Unit, Indian Statistical Institute, Kolkata, West Bengal, India

Fields of works are application of statistical methodologies, pattern recognition, image processing, different computational techniques and their applications.

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