Seasonal to Interannual Variability of Vertical Wind Shear and Its Relationship with Tropical Cyclogenesis in the Mozambique Channel

This article explores the relationship between vertical wind shear (VWS) and tropical cyclone (TC) genesis in Mozambique Channel (MC) for period 1979–2019. Additionally, SST, low-level relative vorticity, 700 hPa humidity upper-level divergence were also analyzed peak cyclogenesis months to explore their contributions. The analyses done using NCEP/NCAR Reanalysis-1 atmospheric fields, monthly Optimum Interpolation SST V2, TC best track data from La Reunion–Regional Specialized Meteorological Joint Typhoon Warning Centre. A total of 43 TCs generated MC observed analysed period. maximum frequency was during January February spatial location coincident with minimum values VWS. VWS showed significant correlations intensity, particularly when considering upper atmosphere (200–500 hPa) or bulk (200–850 mean composites over at hPa, atmosphere, values. However, linear these factors vs. intensity not significant. Analyses interannual Niño-3.4 (subtropical southwest Indian Ocean dipole-SIOD) statistically positive (negative) different lags, suggesting that Niña phase SIOD conditions are favorable weaker thus intensification Channel. Thirteen landfall cases seven Madagascar west coast six coast. (Mozambique) associated strengthened (weakened)