Cyclogenesis in the lee of the Alps: A case study

Abstract

SUMMAraYA case of deep and rapid Cyclogenesis in the lee of the Alps is analysed by means of cross-sections, isentropic maps and tdectories based on synoptic data, to investigate the three-dimensional structure of the phenomenon and the nature of the processes that are responsible for it. The results of the analysis are also compared with available theoretical models. Considerations of the various scales involved in the development lead to a description of the phenomenon in terms of two distinct phases: a very rapid 'trigger' phase due to interaction between the frontal layer and the Alps, and a more usual 'barclinic development' phase. Through a selection process typical of baroclinic instability, the lee cyclone acquires the observed horizontal and vertical scales and undergoes the normal life of a mid-latitude depression. The insufficiency of the present synoptic network for a satisfactory analysis of such a meteorological phenomenon is also stressed.

Evaporative moisture sources during a sequence of floods in the Mediterranean region

“…The main goal of this work is to show that, beyond the local Mediterranean mesoscale and orographic processes (e.g., [Buzzi and Tibaldi, 1978 • (Fig. lc,e).…”

Observational analysis of a Mediterranean ‘hurricane’ over south‐eastern Italy

“…Most of these cyclones have synoptic-scale and baroclinic origins, sometimes aided by the peculiar nature of the orographic flow deflection around the Alps and the Pyrenees (Buzzi and Tibaldi, 1978). Sometimes, however, intense mesoscale vortices have been observed with features closely resembling those of tropical cyclones or polar lows.…”

Simulating lightning into the RAMS model: implementation and preliminary results

“…The case study can be classified as a cyclone developing on the lee of the Alps (Buzzi and Tibaldi, 1978). In particular, an upper-level trough, whose axis was tilted in the SW-NE direction, moved from the UK towards central Europe.…”