Abstract: Calculations with a linear semispectral model of a moving tropical-cyclone-like barotropic vortex (Willoughby 1988) show that a vortex with cyclonic circulation throughout exhibits unphysically fast poleward motion on a ...

Abstract: No abstract available.

Abstract: A barotropic model of tropical cyclone motion follows from calculation of linear wavenumber-1 perturbations on a moving axisymmetric, maintained vortex. The perturbations are Rossby waves that depend upon the radial gradient ...

Abstract: Analysis of a large inventory of in situ observations from research aircraft shows that the gradient wind approximates the axisymmetric swirling flow in the free atmosphere within 150 km of the centers of Atlantic hurricanes ...

Abstract: More than 900 radial profiles of in situ aircraft observations collected in 19 Atlantic hurricanes and tropical storms over 13 years confirm that the usual mechanism of tropical cyclone intensification involves contracting ...

Abstract: This paper revisits calculation of motion for a shallow-water barotropic vortex with fixed mean axisymmetric structure. The algorithm marches the linear primitive equations for the wavenumber 1 asymmetry forward intime ...

Abstract: An important limitation of numerical hurricane track forecasts is the difficulty in coaxing the vortex to assume the correct initial motion. Results from a semispectral, barotropic, linear model suggest a remedy. When the ...

Abstract: Nonlinear motions of a shallow water barotropic vortex on a ? plane differ substantially from the analogous linear motions. The nonlinear model described here, in which wavenumber 1?3 asymmetries interact with each other ...

Abstract: In intense tropical cyclones, sea level pressures at the center are 50?100 hPa lower than outside the vortex, but only 10?30 hPa of the total pressure fall occurs inside the eye between the eyewall and the center. Warming ...

Abstract: n gradient-balanced, cyclonic flow around low pressure systems, a golden radius exists where RG, the gradient-wind Rossby number, is ??1 = 0.618 034, the inverse golden ratio. There, the geostrophic, cyclostrophic, and ...