THE STRONGEST BORA EVENT DURING ALPEX-SOP

The most intense bora case on the northern Adriatic during the ALPEX- SOP (5-7 March 1982) was considered with emphasis on the surface and radiosounding data analyses. The bora onset was connected with a large increase of pressure gradient between the cold upstream air and a cyclone formed in the lee of the Alps. The vertical atmospheric structure shows the existence of stable layers inside and above the NE wind flow and SE wind aloft. It is shown that the strong bora appearance could be successfully described by the generalized hydraulic theory, especially at the time period with the strongest bora. The main problem still theoretically unsolved is the inclusion of the vertical wind shear in the upstream bora layer into theoretical consideration