Abstract: Observations indicate that frontal zones that form in the presence of strong surface sensible heating have a structure that is markedly different from those that form adiabatically. These differences include: a highly ...

Abstract: The geostrophic momentum approximation will be employed to investigate the mechanism of tropopause folding that occurs within upper-level fronts formed by the action of a stretching deformation field in a nonuniform potential ...

Abstract: The geostrophic momentum approximation and a Lagrangian formulation are employed to consider the nature of the fronts that result from the action of a stretching deformation field in a continuously varying potential vorticity ...

Abstract: Narrow cold-frontal rainbands are lines of intense precipitation that straddle surface cold fronts. Recent observational work has revealed that the rainfall within the band is organized into regularly spaced ellipsoidal ...

Abstract: Most conventional wave-CISK models have been used in the study of circulations with aspect ratios less than one, and as a result have been hydrostatic. In general, the most unstable waves in the models are the small-scale ...

Abstract: We address the problem of the stability of nonseparable baroclinic mean states against small-amplitude quasi-geostrophic perturbations. A general numerical methodology is developed that allows us to construct solutions to ...

Abstract: The accuracy Of the WKBJ approximation to the nonseparable quasi-geostrophic baroclinic instability problem is investigated. By direct comparison with an effectively exact solution, we demonstrate for a particular class ...

Abstract: The problem of the origin of midlatitude cyclonic disturbances having characteristic spatial scales of 1000 km or less has remained outstanding for most of this century. Although the theory of baroclinic instability of ...

Abstract: Observational evidence has demonstrated that localized baroclinic zones in the atmosphere are unstable to disturbances with wavelengths of approximately 1000 km. Examples of such disturbances include: polar-front cyclones, ...

Abstract: A case study of a small-scale polar front cyclone observed during the Canadian Atlantic Storms Program (CASP) is presented. The cyclone forms along an essentially two-dimensional front, which is in approximate thermal wind ...