Aerial Analysis of the Strongest North Adriatic ALPEX Bora Case

This paper presents the results of an aerial analysis of the bora case- on 6-7 March 1982 using aerological data from 10 stations in the region 40° - 49° N, 10° - 22° E. The objective analysis method has been constructed for the presentation of the isentropic surfaces and the two-dimensional isentropic divergence and the vertical component of vorticity. The objective analysis scheme considered seems to be capable of describing the main three-dimensional features of air flow during bora: the descent of a stable bora layer not only along the NE bora flow, but also perpendicular to this flow in the upstream region; the region of vertical divergence forming a "dead region" with strong turbulence downstream; the anticyclonic vorticity in the lee of the Alps and cyclonic circulation in the mid-Adriatic before the bora onset