I have seen things like this appear once or twice on cold winter mornings, a frozen spike of water from an ice-covered container or very small body of water (puddle).

I found the photo below at Mel Bartels and BBAstroDesigns and the caption reads:

An ice spike in a bird bath following a cold snap December 2014

What could be happening here? How might the two structures form like this, both tilted against gravity?

update: Comments indicate that Wikipedia's article Ice spike gives an explanation based on the growth of a tube as the freezing process extends from top-down into the liquid, pushing remaining liquid out a hole and growing vertically from a central opening in the tube.

However, I can't see how this makes a spike with such a large angle with respect to vertical. It really looks to my untrained eye like this is a frozen jet, but that's not so likely as water is not so compressible.

enter image description here

  • 1
    $\begingroup$ en.wikipedia.org/wiki/Icicle and en.wikipedia.org/wiki/Ice_spike explained here unless I am missing something ? $\endgroup$
    – gansub
    Jan 26 '19 at 3:41
  • $\begingroup$ @gansub there it is in all it's glory, bird-bath and all. It's an ice-spike, I'll update the question accordingly. The large angle with respect to vertical shown in the question and here are particularly hard to understand, and this isn't really addressed in the Wikipedia article. I'll try to drill down on some of the references shown there. Thanks! $\endgroup$
    – uhoh
    Jan 26 '19 at 3:52

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