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IMG_2155-lenticular_clouds_pyrenees20150104.jpg
Sun dogs forming in lenticular Clouds near Bourg-Madame, on the Spain/France border of Catalonia. Clouds like these more or less stationary and lens-shaped,  forming in the lower atmosphere, usually perpendicular to wind direction. Where I took this image was quite cold - the other side of the mountains, warm air was blowing in from the Mediterranean Sea - with the combination of both, the vapour was likely formed. The sun dog - or the rainbow colours in the halo, are formed through light refracting through ice crystals in the atmosphere.