Mr. Gokul Vishwanathan Profile

Gokul Vishwanathan

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Proceedings Article | 5 May 2016 Paper

Study on the recent severe thunderstorms in northern India

Gokul Vishwanathan, Sunanda Narayanan, G. Mrudula

Proceedings Volume 9876, 987613 (2016) https://doi.org/10.1117/12.2223969

KEYWORDS: Satellite imaging, Satellites, Remote sensing, Thermodynamics, Doppler effect, Radar, Meteorology, Convection, Temperature metrology, Ions

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Thunderstorm, resulting from vigorous convective activity, is one of the most spectacular weather phenomena in the atmosphere which is associated with thunder, squall lines and lightening. On 13 April 2010, a severe storm struck parts of Bangladesh and eastern India which lasted about 90 minutes, with the most intense portion spanning 30–40 minutes. The severe Thunderstorm on 13^th April 2010 spawned a large tornado, which lasted about 20 minutes and was the first tornado recorded in Bihar history. In the year 2015, Bihar experienced a similar storm on 21 April during which multiple microbursts were observed. Various meteorological parameters have been analyzed to study the factors affecting the development of the thunderstorm. Satellite images from KALPANA and Meteosat has been analyzed to capture the temporal and spatial evolution of these storms. The satellite images show the development of a convective clouds system in the early afternoon hours which developed further into the severe storms by late evening. The analysis carried out further using K-index, lifted index, CAPE etc also shows the development of multiple cells of convection. Further analysis of these storms is presented in the paper.

Proceedings Article | 5 May 2016 Paper

Possible development mechanisms of pre-monsoon thunderstorms over northeast and east India

Sunanda Narayanan, Gokul Vishwanathan, Mrudula G.

Proceedings Volume 9882, 98821U (2016) https://doi.org/10.1117/12.2223719

KEYWORDS: Clouds, Wind energy, Earth observing sensors, Satellites, Lithium, Satellite imaging, Convection, Liquid crystal lasers, Doppler effect, Radar

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Thunderstorms are mesoscale convective systems of towering cumulonimbus clouds of high vertical and horizontal extent lasting from a few minutes to several hours. Pre-monsoon thundershowers over the past 10 years have been analyzed to understand the organization, horizontal and vertical development and dissipation of such severe events. Kalbaisakhi’s/ Norwester’s over north east and East India is given preference in this study, while some of the other extreme events are also analyzed due to their severity. The meteorological parameters like horizontal and vertical wind, precipitable water etc., and derived variables such as Severe Weather Threat (SWEAT) Index, Convective Available Potential Energy (CAPE), and Convective Inhibition Energy (CINE) of the identified cases are analyzed using observations from NCEP and IMD. Satellite observations from IMD and TRMM are also used to analyze the development and moisture flow of such systems. The analysis shows that some of the parameters display a clear signature of developing thunderstorms. It is also seen that cloud parameters such as convective precipitation rate and convective cloud cover from NCEP FNL didn’t show much variation during the development of storms, which may be attributed to the limitation of spatial and temporal resolution. The parameters which showed indications of a developing thunderstorm were studied in detail in order to understand the possible mechanisms behind the development and organization of thunderstorm cells.

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