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What is freezing fog?

Question

I’m a professional chauffeur and listen to your travel bulletins all the time. They always warn me about freezing fog, but I’ve never experienced it. What is freezing fog?
John, Heathrow

Answer

** Definitive **
Name: Chris Lowrie
Qualification: Weather Angel
Answer: Freezing fog is fog that’s freezing! Actually, fog is formed by tiny water particles, like the steam from a kettle. Freezing fog is those water particles, which have got to less than zero degrees. That would make the roads much more slippery, so it would be more dangerous. You can’t see it, but John will have experienced it.

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