Thought you might appreciate what I found in a bird bath on the morning of 11th February - when it was -7C here.
I'd just filled the bird bath with fresh water the afternoon before, but I guess there must have been some ice below it....
It does look rather rude, doesn't it?
(Sorry, but I cannot find a better explanation than this just now - Defying the laws of gravity: ice spikes)
We experienced something similar in Lanark many years ago. The spike then rose across the bird bath, making it look like a gnomon on a sundial. It had a broad, triangular base and was noticeably hollow in the centre. It happened on the night when we'd had the coldest weather of that winter - -27C at Carnwath near us, rising to -18C during the day. It was so cold that time that a curling match was held at Lanark Loch the next day - the first in nearly 100 years!
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