Ice Circle

[knocker]

Not that unusual but this is a classy video.

 

Video of amazing natural ice circle https://www.facebook.com/video.php?v=552468648169459 â€¦

[Evening thunder]

That is a very nice example.

 

A small one of these formed on my local river in Devon in 2009 when I recorded -9c:

 

http://www.telegraph.co.uk/earth/4227030/Spinning-ice-disc-phenomenon-seen-in-British-river-for-first-time.html

 

Then in December 2010 I personally saw one on Christmas day at -14c, although frozen back into surrounding ice, several miles downstream on the same river behind my house...

(possibly other small attempts in there too)

 

I do get the feeling they aren't quite as rare as some articles made it sound though, as you suggest. 

Edited December 2, 2014 by Evening thunder