in the formation of these clouds sausage tonight just 20 clock probably two effects were involved: A wind convergence, and a relatively unstable stratification of the surface air with lower temperature and high water temperature. At the right edge of the cloud from the national SW wind is "sanded" addition.
At a water temperature of 23 ° C, an air temperature of about 15 ° C and a vertical temperature gradient from 0.8 to 0.9 ° C/100m near the ground, it takes only a very weak convergence to the convection in motion to bring.
After some time, is pulled from the northwest rain showers, and the wind picked up considerably. It was the convergence and thus disturbed convection - the cloud has disappeared rapidly.
If the weather is the observed evening convection over the valley and basins way, known as so-called "thermal inversion" downslope winds from the surrounding edges help to create convergence, and finally the detachment and rise of the warmer air from the valley floor. This form only in rare cases, cumulus clouds, because the air is much drier.
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