Fog warnings

[OhYouBadBadkitten]

here just in case you've not opened the curtains yet!

[KlickKlackknobsac]

Thanks Kitten. I am well out of the fog warning zone but its hugely foggy here too.

[GloriaSmud]

More fog warnings for tonight.

[OhYouBadBadkitten]

thanks Gloria, looks more extensive than last night.

[OhYouBadBadkitten]

More fog warnings with associated travel problems and flight disruptions expected.

[TheHumancatapult]

it is has been really bad here .dd nearly got hit by car this morniong walking to school even though had a high vis vest on

mix of bad fog , country lanes with no footpaths ,speed limit of 60 and people thinking that means do 60 evne when you can not see more than 3 m

[OhYouBadBadkitten]

oh cripes THC, that sounds dangerous.

[TheHumancatapult]

This morning is even thicker . Dd Is pleased though after yesterday's near miss am not goung out in it

But not seen the news but am not hearing as many planes overhead and were right on flight path for Stanstead

[OhYouBadBadkitten]

visibility does look pretty poor at stansted
rubbish time of year for travelling!

[Lexilicious]

OYBBK - What's the difference between fog and mist, and why is it so foggy this week - what weather system(s) or temperatures have caused it? Am intrigued and would love a brief intro. Is it typical for November or should it be earlier? ('Season of mists and mellow fruitfulness' - perhaps?)

[OhYouBadBadkitten]

Fog is officially when visibility is below 1000m. I believe it is thick when visibility is below 200m and dense when it is below 50m.

Fog tends to occur under the influence of a high pressure. They also tend (as you've probably noticed occur in autumn or winter, usually under clear skies. As night falls the ground cools quickly and if the surface air starts as moist (and generally mild) it then cools quite quickly as the ground cools. This means the air reaches saturation and the moisture condenses into tiny water droplets.

Conditions are absolutely perfect for it at the moment in the SE. We've been under the influence of a high pressure of Europe. Warm air has been coming from the south and with high humidity it's been the perfect recipe.

You'll notice that you especially get fog around bonfire night. smoke particles from fires and fireworks are hygroscopic (which means they attract water) so fog builds easily to make a smog type condition.

[OhYouBadBadkitten]

sorry for some of the illiteracy in the above. Just got back from a very long school trip.

[TheHumancatapult]

Ty ok today it would be dense fog can not see anything beyond 3-4 metres here . Am sick of it now I do not mind cold and dry but this is taking the biscuit

[OhYouBadBadkitten]

That would def classify as dense fog!! I think by the end of the week it should improve considerably (fog wise, getting potentially very windy for the northern half of the uk)

[Lexilicious]

Thanks OYBBK - really interesting! There's a fantastic photo on the Telegraph today of fog over Dubai. They also have a humidity vs high pressure tendency this time of year it says.

Dubai fog

[TheHumancatapult]

it did lift here eventually but was first time we had a ground frost

[OhYouBadBadkitten]

That picture is amazing!! It looks almost unreal.