Tropical cyclones or typhoons or hurricanes are basically an intense rotating circular system, characterized by intense low pressure at the center, high winds associated with intense convective cells in the wall cloud, associated heavy rains and storm surge. Tropical cyclones affect the life of millions of people around the globe. INSAT-3D is the second dedicated meteorological satellite which was launched on July 26, 2013, with two meteorological payloads: Imager and Sounder. It is placed at 83 °E over the equator in the geostationary orbit. Receiving, processing and dissemination of imageries and derived products from INSAT-3D are taken care by INSAT Meteorological Data Processing System (IMDPS), which is operational at National Meteorological Satellite Centre, India Meteorological Department, New Delhi. Currently, three satellite-derived rain estimates are generated at IMDPS, New Delhi: Qualitative Precipitation Estimate (QPE), Hydro-Estimator (HE) and INSAT Multi-Spectral Rain Estimate (IMSRA). In this study, the performance of HE and IMSRA over very severe cyclonic storm Vardah and severe cyclonic storm Mora has been evaluated with respect to GPM (IMERG). The statistical and skill score analysis is performed both over half-hourly scale with respect to various stages of cyclone genesis, intensification and weakening and on the daily scale. At the instantaneous time during half-hourly analysis, IMSRA has displayed better relation and skill with GPM (IMERG). However, during daily accumulated analysis, it is found that IMSRA tends to underestimate after a specific value. On a daily scale, HE has exhibited better skill with IMSRA.

热带气旋或台风或飓风基本上是一个强烈的旋转圆形系统，其特征是中心的低压低，与大风和壁云中强对流单元有关，伴有大雨和风暴潮。热带气旋影响着全球数百万人的生活。INSAT-3D是第二颗专用气象卫星，于2013年7月26日发射，具有两个气象有效载荷：成像仪和探测仪。它被放置在地球静止轨道赤道上方83°E处。INSAT气象数据处理系统（IMDPS）负责从INSAT-3D接收，处理和传播影像和衍生产品，该系统在新德里印度气象局的国家气象卫星中心运行。目前，在新德里的IMDPS上，产生了三颗来自卫星的降雨估算：定性降水估算（QPE），水电估算器（HE）和INSAT多光谱降雨估算（IMSRA）。在本研究中，已针对GPM（IMERG）对HE和IMSRA在非常严重的气旋风暴Vardah和严重的气旋风暴Mora上的性能进行了评估。关于旋风发生，强化和减弱的各个阶段，以半小时为单位进行统计和技能得分分析，并以日为单位进行分析。在半小时分析的瞬时时间内，IMSRA与GPM（IMERG）表现出更好的联系和技能。但是，在每日累积分析过程中，发现IMSRA趋向于低估特定值。在日常工作中，HE在IMSRA方面表现出了更好的技能。