Abstract: A simple and concise interpretation of stratospheric sudden warmings is offered in terms Of the transient changes in the potential vorticity pattern. The warming is viewed as a manifestation of the reversal of the mean ...

Abstract: An estimate of the time variation of the pressure drag component across the inner portion of the St. Gotthard section of the Alps is derived for the special observational period (March?April 1982) of the ALPEX project. ...

Abstract: Perturbations of the classical Eady model are treated in terms of the system's two intrinsic baroclinic edge waves. This provides a simple quantitative example of the wave coupling interpretation of quasigeostrophic ...

Abstract: A study is undertaken of the concurrent development of fronts and cyclones within a growing baroclinic wave. The dynamical framework for the study is that of the semigeostrophic, adiabatic flow of a uniform potential ...

Abstract: Breaking waves on the tropopause are viewed as potential vorticity (PV) streamers on middle-world isentropic levels. A Northern Hemisphere winter climatology of the streamers? spatial distribution and meridional orientation ...

Abstract: Jet streams located on the dynamical tropopause are accompanied by coaligned bands of enhanced potential vorticity (PV) gradients, and these bands can serve as space?time evolving waveguides for synoptic and larger-scale ...

Abstract: Upper-tropospheric fronts and frontogenesis are viewed from a potental vorticity (PV) perspective. The rudiments of this approach are to regard such a front as a zone of strong PV gradient on isentropic surfaces, and to ...

Abstract: Rainstorms that occur on the south side of the European Alps during spring and fall are usually accompanied at the tropopause level by a single elongated filament of intruded stratospheric air. This study examines the ...

Abstract: It is suggested that the constructive interference of a wave packet of stable normal modes could constitute a mechanism for local fronto- and cyclogenetic development. The potential efficacy of this mechanism is illustrated ...

Abstract: A dynamically based climatology is derived for Northern Hemisphere atmospheric blocking events. Blocks are viewed as large amplitude, long-lasting, and negative potential vorticity (PV) anomalies located beneath the dynamical ...