Kelvin-Helmholz waves above Ajdovščina
Kelvin-Helmholtz waves observed at 3.6km above the Vipava valley on 16 March 2016 were caused by wind shear between Bora at low altitudes and southerly winds in layers above. This type of structures, found to be present in moderate and strong Bora episodes with well defined vertical layers and strong wind shear, is being investigated by lidar-based remote sensing of aerosol loading. The waves are only visible by eye in the presence of clouds at the boundary between the two layers.
High resolution image can be downloaded here.