Fig. 6: Differences in various TC thermodynamic conditions.

a Sea surface temperature. b Total column water vapor. c Atmospheric stability. d Convective available potential energy. e Geopotential at 850 hPa. Dashed areas in subplots a–e indicate differences that are significant at the 95% confidence level. f Steering flow and Mascarene High distributions; blue and red curves represent the 1540 gpm isopotential line at 850 hPa. These influence factors are calculated as the average from November to April. The green dashed rectangle represents the main TC area of the SIO.