Main bora gusts – a model explanation

Abstract

In contrast to the known models of bora wind, originating from the idea of rather uniform hydraulic flow, the basis of this physical model explanation are observed gust characteristics of bora. The essence of this model explanation is the fact, that bora is primary a very gusty wind, and the idea that main gusts are not a consequence of turbulence in a general flow, but of cylinders of cold air rolling down the slope on the warm side of the ridge. Main rolls together with the turbulence and partly sliding of cold air develop a general flow with observed bora characteristics.