How thick does fog have to get before a warning is issued by the Met Office?

We live with a mile and a half of the M5 and at the moment (2.30 PM) we have a visibility of around 100 M. I have been retired for almost 5 years now, and in that time I’ve never seen fog as thick as this persist as it’s done today in Bradninch. I would have thought that the Met Office would have a warning in force this afternoon of fog for drivers on the motorways and roads across East Devon, Dorset and Somerset. But the warnings board on the Met Office website is as you can see completely blank.

So how thick does fog have to get before a warning is issued by the Met Office?

Interesting question, obviously the answer is thicker than 100 M, or they would already have a warning in force to cover a motorway and busy regional airport…

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Author: xmetman

An ex-metman passionate about all things to do with weather, climate and clouds

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