On horizon, in the warm light of sunset, is shaping Cumulus Castellanus clouds. The castle tower form is a consequence of the strong currents of vertical air, which have modelled these clouds. Their presence announces rainy weather.
The picture was captured with a Nikon D40X camera and Nikkor 18-55mm f/3.5-5.6G ED AF-S DX lens, using these settings: focal length – 55 mm, exposure time – 1/80 sec, ISO 100, lens aperture – 5,6.