Evolution of double-eye wall hurricanes and emergence of complex tripolar end states in moist-convective rotating shallow water model

A detailed investigation of linear instabilities double-eyewall hurricane-like vortices with double maxima (“walls”) azimuthal velocity and vorticity around the central minimum (“eye”) their nonlinear saturation is carried out in framework moist-convective rotating shallow water model. It shown that developing barotropic instability leads to inward displacement gradual disappearance inner wall formation a nontrivial tripolar quasi-stationary structure, provided second, outer, initial vortex high enough. The effects moist convection lead enhancement outer wall. In comparison, under influence same instability, an stronger than one evolve toward monopolar single-eyewall structures.