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On the movement of tropical cyclone LEHAR

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Abstract

Purpose

In this paper, an attempt has been made to delineate the physical processes which lead to the westward movement of the North Indian Ocean tropical cyclone LEHAR.

Methods

The Advanced Weather Research and Forecasting (ARW) model is used to simulate LEHAR with 27 and 9 km resolutions. In addition to that, all terms of the complete vorticity equation are computed to obtain the contribution of each term for the vorticity tendency. The vorticity tendency is calculated in four sectors, namely northwest, northeast, southwest, and southeast and assumed that the cyclone moves from its existing location to the nearest point where the vortices tendency is maximum.

Results

The results indicate that the model performed well in simulating the characteristics of cyclone compared with the Satellite and other observations. It is noticed that the vorticity stretching term contributes most to the positive vorticity tendency. The second highest contribution is from the horizontal advection thus indicating the secondary importance of steering.

Conclusions

The distribution of lightning flash rates are higher in the SW and followed by NW sectors of the cyclone indicate more strong convective clouds are in SW sector. The equivalent potential temperatures (θ e) at different stages of before, during and after the mature stage of the cyclone reveals that the wind-induced surface heat (WISH) exchange process is a plausible mechanism for the intensification of LEHAR.

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Acknowledgements

The authors are thankful to India Meteorological Department for providing tropical cyclone observations. The authors acknowledge NCEP-GFS to avail the global forecasting fields on public domain. Authors are grateful to the MOES, Govt. of India for providing the funds vide reference MM/SERP/Andhra-Univ/201/IND-4/002/1307 for conducting this research.

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Author notes

  1. Brahmananda Rao V

    Present address: CPTEC–INPE, Cachoeira Paulista, Brazil

Authors and Affiliations

  1. Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia

    Hari Prasad Dasari

  2. Department of Meteorology and Oceanography, Andhra University, Visakhaptnam, 530003, India

    Brahmananda Rao V, Ramakrishna SSVS, Paparao Gunta, Nanaji Rao N & Ramesh Kumar P

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Dasari, H., V, B., SSVS, R. et al. On the movement of tropical cyclone LEHAR. Earth Syst Environ 1, 21 (2017). https://doi.org/10.1007/s41748-017-0025-7

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