Mechanism of Asymmetric Precipitation by Tropical Cyclone Nada Over the Indian Peninsula

The Tropical Rainfall Measuring Mission (TRMM) and ERA5 reanalysis data are used to research the asymmetric precipitation induced by tropical cyclone (TC) Nada, which made landfall on southeastern coast of Indian Peninsula December 2, 2016. mechanism is analyzed during passage TC. results show that spatial average rate increased a maximum 1.78 mm/hr Peninsula, where vorticity TC center more than 5 × 10–4 s–1 at 850 hPa 06:00 UTC 1. Near troposphere had strong upward convection vertical velocity 0.7 pa/s. positive (negative) wind shear was located left (right) side path. value area consistent with distribution extreme precipitation. TC-induced rainfall mainly caused superposition Nada low-level cold air intrusion, resulted in unstable atmospheric stratification, uplifting warm humid producing convection. This study offers new insights into interaction intrusion northern Ocean.