Keith (Southend) wrote:
A decade or so ago I would have looked at the forthcoming charts showing
high pressure on the near continent with a slack southerly flow and
almost guaranteed widespread fogs. However, so far the forecasts have
hardly mentioned fog(s). Is this to do with the "cleaner" air we now
live with, compared to the soot producing smogs of yester-year. Wew
hardly get an hour or two of fog in a year now, here at Southend-on-Sea,
yet I can remember days with it, and some days it never cleared at all
through the day.

What has changed?

I've got the impression these Highs seem to quickly become filled with
cloud as moist air comes over the top of them; thereby suppressing any
tendency for radiation type fog.

I good 8/8 layer of Sc at 5000' is enough to render any Autumn/Winter
day gloomy but not foggy, and night frost-free.

Mmmmm... Anticyclonic gloom....

--
Chris
http://www.ivy-house.net
Swaffham, Norfolk