Tag: cirrus

Mackerel Sky

Following some bad weather recently, I saw the beautiful 'mackerel sky' above. A mackerel sky can be used to forecast weather, but it is at the more challenging end of the weather lore spectrum. The simple bit is this: a mackerel sky of any kind means change is likely. This…

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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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More Beautiful Sun Dogs

My thanks again to Alan Gibson for sending over some great images. These are sun dogs or parhelia and parts of a "22 degree halo". They are created when the sunlights refracts through ice crystals, creating colourful effects a couple of fist widths from sun . They can presage deteriorating…

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