This was quite a bright circumzenithal arc, considering the thickness of the cloud, although the colours weren't as strong in the thicker parts of the cloud.
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Zooming in a bit as the cloud drifted off. The colours were much more saturated when the arc was in the thinner parts of the cloud.
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Although numerous sundogs suggested there might be circumzenithal arcs they were mostly faint or obscured by cloud. This one would easily have been missed by a casual observer.
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Fortunately a large gap in low level cloud coincided with a very smooth and colourful arc. The sun altitude was 15 degrees, lower than the optimum altitude but it still produced a bright arc. This one was obvious to anyone who looked up.
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