Kelvin-Helmholtz Wave Clouds in Denmark
April 02, 2007
Suddenly, in front of my kitchen-windows (in Denmark) I saw these wave-like clouds and recognized the patterns of Kelvin-Helmholtz instability. The waves changed very fast, and after 2 minutes their characteristic pattern had nearly disappeared. The mean temperature in December in Denmark had been very warm with lots of rain and fog, and stormy weather was again approaching. Apparently, the formation of these waves was initiated by two different layers of air, having different temperature and moisture conditions, moving at different speeds. If the cloud deck had not been so transparent, I couldn't have seen these fascinating waves from below. Photo taken on December 30, 2006.