After last night’s low of -5Celcius, freezing fog formed and lingered around for a good part of the morning, especially in dips and valleys wehre the sun hadn’t quite reached.

First of all, you may be thinking what is the difference between mist and fog? Well they are both made up from water droplets, the main difference being that fog is much denser than mist, and hence has worse effect on visibility when its bad.

Freezing fog, is where the water droplets cool below freezing point, but don’t freeze. Don’t ask me how this is possible, thats just what happens! A noteable effect of freezing fog are the ice formations it leaves behind on surfaces like windscreens and lamposts. This distinctive ice formation is called “rime” and looks quite streaky and rough to touch leaving almost “feather like” patterns.

freezing fog glasgow

The photo was taken beneath the Whitecard viaduct in Glagsow. As you can see there is remarkably reduced visibilty beyond about 300 metres. This was taken at 9am and the fog lingered around until about lunch time.

Other types of fog you get are Advection, Radiation Fog. I will explain these one soon.

Originally posted 2008-11-03 19:10:34.