Explain this

It's science.

I know why, it's difficult to adequately explain though. Super cooling, lack of an initial crystalline structure, etc...
 
The process is called nucleation. Often, crystals won't form on their own, but will only grow from extant crystals. ice is like this, ice crystals have to be nucleated by something, thus water can become supercooled without freezing.
 
Steingar is right. You've got supercooled water. Water has some real unique properties, once is that as it freezes it forms crystals (which is why it gets lighter). Given the right conditions, you can prevent the crystals from forming even if the water is below the freezing point.

http://www.sciencedaily.com/releases/2010/04/100421133114.htm
 
Yup, nothing unusual there. Just supercooling, with freezing initiated by a mild shock.

And it should scare the **** out of you about what that means for structural ice formation.
 
Yeah, google supercooled drizzle droplets sometime. Roselawn, IL ATR crash a few years back.
 
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