Rainfall estimation of landfalling tropical cyclones over Indian coasts through satellite imagery

• DOI: 10.54302/mausam.v63i2.1377
• Publication Date: 2021-12-16T12:11:12Z
• Authors: CHARAN SINGH; SUNIT DAS; R.B. VERMA; B. L. VERMA; B.K. BANDYOPADHYAY
• Keywords: African easterly jet; Rainband; Landfall

One of the most significant impacts landfalling tropical cyclones is caused by copiousrainfall associated with it. The main emphasis present study to provide some guidance operational forecastersfor indicating possible rainfall over areas likely be affected after landfall. Study 14 pastlandfalling reveals that maximum occurred in first forward quadrant cyclonemovement, followed second and near track cyclones. Isohyetal analysis 24 hoursrainfall for each cyclone occurrence heavy generally confined up 150 kms radius from thestorm centre found extend 300 gradual decrease amount. rainfallreceiving are mostly covered convective clouds cloud top temperatures -80 -60 ºC, prior afterthe landfall systems. In 93% out cases studied, 70 % convection lay right thetrack. To examine asymmetry due distribution convection, derivedfrom satellite infrared imagery data have been taken as proxy strong convection. It also revealed thatthe slow moving cause rain rather than fast Bay Bengalcyclones which crossed coast cyclonic storm very severe 71.4% within range 0-10 cm, 22.8% 11-20 cm 4.3% 21-30 area kmsfrom storms. For Arabian Sea cyclones, general, about 70% occurredwithin 16-25 hours.