01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-05-0302 |
| Title of Abstract | Satellite-Based Analysis of Rainfall Structure in Rapidly Intensifying Tropical Cyclone Dana: Insights from GPM IMERG and DPR Observations |
| Authors | Devashish Prakash Singh*, Dr Shruti Upadhyaya, Dr R Maheshwaran |
| Organisation | Indian Institute of Technology, Hyderabad |
| Address | IIT Hyderabad Hyderabad, Telangana, India Pincode: 502285 E-mail: cc23resch11002@iith.ac.in |
| Country | India |
| Presentation | Oral |
| Abstract | Tropical Cyclone Dana (October 19⿿25, 2025) was a high-impact post-monsoon system over the Bay of Bengal that underwent rapid intensification (RI) between 23 and 24 October, with satellite-estimated wind speeds increasing by over 30 kt within 24 hours. The cyclone followed an anomalously long 1780 km track nearly twice the post-monsoon climatological mean with a slow translation speed of 10.8 km/h and a prolonged landfall duration (~9 hours). Dana affected over 4.1 million people across 14 districts in Odisha and West Bengal, causing estimated economic losses of ⿹616 crore [1]. This study integrates Global Precipitation Measurement (GPM) Integrated Multi-satellitE Retrievals (IMERG) (21⿿25 October) and Dual-frequency Precipitation Radar (DPR) (22 and 25 October) data to analyze Dana⿿s precipitation evolution from genesis to dissipation. IMERG provided continuous high-resolution mapping of rainfall during key lifecycle phases. DPR snapshots enabled detailed vertical profiling of convective organization and inner-core structure. Results from IMERG show the gradual strengthening and gathering of convective activity with increased precipitation around the TC center during the rapid intensification period. DPR data showed a shift from mostly shallow rain (less than 8 km high) with the majority stratiform precipitation type during the early stage to deep convective clouds (over 12 km high) forming a symmetric eyewall. The precipitation characteristics showed a strong leaning towards the northwest quadrant at landfall, with near-surface rainfall reaching above 170 mm/hr due to vertical wind shear and the TC movement. This multi-sensor analysis highlights how satellite data help us understand cyclone intensification and rainfall risks in the Bay of Bengal. References: 1. IMD Report: https://internal.imd.gov.in/press_release/20241107_pr_3389.pdf. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | Rapid Intensification, Inner-Core Convective Organization, GPM IMERG and DPR Synergy, Azimuthal Precipitation Asymmetry, Extreme Precipitation, Human Vulnerability. |
| For Awards | yes |
| Date Of Birth | 25-12-1997 |
| ECSN Registration Number | IIOE2-ECSN-0171 |