Contributions of Various Temporal Components of Large-Scale Parameters in Tropical Cyclone Genesis over the North Indian Ocean

This work compares the contributions of synoptic, intraseasonal, and interannual components large-scale parameters to tropical cyclone (TC) genesis over North Indian Ocean (NIO) from April December 1979 2020. A composite analysis is employed with respect TC time location. It shown that most TCs occur when total sea surface temperature (SST) between 28 30 °C SST anomalies in three ranges are small (with magnitude less than 0.2 °C). The form mostly vertical zonal wind shear −6 6 m s−1 falls within −12 −3 s−1, synoptic component being a positive contributor. intraseasonal vorticity convergence low level, motion specific humidity middle convection contributes dominantly genesis. Synoptic-scale disturbances obtain barotropic kinetic energy climatological mean flows, former dominant southeastern sector, latter northwestern sector. temporal environmental factors compared for Arabian Sea (AS) Bay Bengal (BOB) early season (April through June) late (September December). relative also formation among NIO, northern Atlantic (NTA), Northwestern Pacific (WNP), Northeastern (ENP).