Abstract
Abstract. Cyclone Megh, a category-3 (Saffir-Simpson scale) cyclonic storm is regarded as the worst tropical cyclone to ever strike Yemen’s island of Socotra. In this paper, we aim to investigate the wind structure of cyclone Megh using Synthetic Aperture Radar (RISAT-1 SAR) observations. An algorithm for the cyclone wind retrieval has been applied for SAR data of Nov 8, 2015 at 0238:09 UTC in the Arabian Sea. The intensity of cyclone is 30 m/s with the 16.65 km radius of maximum wind speed from the centre of the cyclone. The high resolution SAR data analysis bring to focus the possible presence of eyewall mesovortex in case of Megh. Recent work has shown that vorticity mixing in the tropical cyclone (TC) inner core can promote mesovortex (MV) formation and impact storm intensity. This has further been corroborated using INSAT-3D and MODIS optical band observations of clouds. Analysis of these satellite derived cloud microphysical properties shows the presence of larger hydrometeors surrounding the eye due to possible embedding of stratus and stratocumulus cloud decks. Thus, this kind of study helps in understanding the microphysical processes within a TC as well estimating their impacts on cyclone intensity and lifetime.
Highlights
Satellite remote sensing of wind speed via multi-sensors, such as scatterometers, radiometers, and synthetic aperture radar (SAR), has contributed accuracy to weather forecasts
An empirical C-band Cross Polarization (C-2P) backscatter model was developed to retrieve high resolution ocean surface wind speed from RISAT-1 SAR data, which eliminates the need for radar incidence angle inputs and provides a linear response at high wind speeds for tropical cyclones (Jagdish et al, 2018a)
Multi-satellite optical and microwave observations of cyclone help us in understanding the complex processes taking place inside a cyclone.In this manuscript, Cyclone Megh has been analysed using synergistic observations from RISAT-1 SAR, Moderate Resolution Imaging Spectro-radiometer (MODIS) and INSAT-3D data
Summary
Satellite remote sensing of wind speed via multi-sensors, such as scatterometers, radiometers, and synthetic aperture radar (SAR), has contributed accuracy to weather forecasts. The phase and spatial distribution of cloud and precipitation particles above the 00 C isotherms in three Atlantic hurricanes has been analysed through aircraft observations and it was found that ice particles were present largely in convective and TC Megh was an extremely severe cyclone that formed in the Arabian Sea on 5 November, 2015 and weakened on 10 November, 2015 after making landfall at Somalia and Socotra. It was a category-3 cyclone on Saphir Simpson scale. The 1minute maximum sustained wind speed was 205 km/hr and 3minute wind speed was 175 km/hr
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