Tag: presage weather

Circumzenithal Arcs

My thanks to Simon Cadman for the following generous email and some great images of some sun dogs and the more rarely-spotted, 'upside-down rainbow', also known as a 'circumzenithal arc' or 'Bravais' arc'. Circumzenithal arcs and sun dogs form when sunlight refracts through ice crystals, not rain as with rainbows.…

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