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Old 18th Mar 2019, 07:35
  #104 (permalink)  
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Most aviation meteorology books with a section on icing will tell you about supercooled water droplets - ie those existing below 0 degrees C which can be found in temperatures as low as -40 degrees C, normally in cloud with lots of vertical movement.

However, it requires the absence of appropriate freezing nuclei in the atmosphere for the water to freeze onto.
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