Stormy Weather II

[ferneyhoughgeliebte]

I was taught to hop the decimal point along, but now they are told to slide the numbers!

YES!!! I had real problems with this new concept when I was a Supply Teacher for Bradford Primary Schools 20 years ago - and (probably as a result) so did the kids. After a while, I gave up and told them the older way - end of problem, the kids could then do the Maths - but saying that it was an alternative to the way their teacher had told them, and that they must do it that way when s/he came back.

[BBMmk2]

The foggey, woggy dew.....

[Serial_Apologist]

The foggey, woggy dew.....

Today's fog is advection fog. Very often seen over thawing snow - this differs from inversion fog. In the case of inversion fog, temperatures fall below the dewpoint near ground level at or around sunset, because ground level is the first to lose the sun's heat: the temperature above that level is still warm, putting a lid or "cap" on it - ("the inversion layer", below which moisture condenses on any dust particles floating around to form fog, above which the mositure evaporates away). As the chill air levels upwards in line with the setting sun, so the fog layer thickens. It is then only removed by either wind rising to blow it away, or a gap between the wet and dry bulb temperatures being restored, the dewpoint returning to the surface.

Temperatures are slowly rising today in conjunction with slightly milder air being transported south replacing the cold pool associated with the calm high pressure centre as it retreats southwards. Advection fog forms when this warmer air drifts across still cold surfaces - the principle can easily be seen on a miniature scale by taking ice cream out of the freezer, and after a short while "steam" rises from its surface - advection fog. One difference between inversion fog and advection fog is that advection fog is less easy to shift because its "cause" is being reinforced by the contrast between warm above and cold beneath is maintained until humidity levels fall. This can also sometimes be seen as "clag", low stratus fractus, forms immediately after the passage of a cold front. Raggedy amorphous low cloud can typically be seen mysteriously clinging around trees in hollows around hill slopes, where lingering swarm air pockets are being cooled below the dew point by falling rain. Thus the causes of all fog are based on the same principles. Then, as the humidity falls at lower levels with heating, it rises to higher levels to form stratus cloud - which is really what fog is, the only difference being that it is stratus cloud sitting on the ground.

[DracoM]

Sun, thick cloud/fog, weird.

[cloughie]

Dull and not very warm here - a ‘nothing’ day really.

[ferneyhoughgeliebte]

Bright and sunny here in this bit of the Pennines - little cloud, a bit chilly, and rather damp underfoot.

[ferneyhoughgeliebte]

Bright and sunny here in this bit of the Pennines - little cloud, a bit chilly, and rather damp underfoot.

90 mins on, and a bank of cloud/mist has wandered over the hill and silvered out the view.

[BBMmk2]

Bright and sunny here in this bit of the Pennines - little cloud, a bit chilly, and rather damp underfoot.

I’d better come up to your place today then, Ferney!

Rather dull and dreary here today.

[oddoneout]

One of cloughie's 'nothing days' here today, as was yesterday. It may be milder than a few days ago but it doesn't feel it due to the damp, and the conditions are not joint-friendly(as in skeletal...) which, coupled with the grey sunless sky, means things are harder work than I would like. Never mind, can't do anything about the weather, at least I'm not working at present so can find ways round the problems.

[Flay]

Pure blue, cloudless sky here in S. Yorks!

[DracoM]

3rd successive day in which the fells hereabouts are more or less dawn to dusk invisible under thickening cloud / fog / yuk / dreich.

[Serial_Apologist]

I bet you all can't wait for the change that's going to take place on Saturday!

[Stanfordian]

I bet you all can't wait for the change that's going to take place on Saturday!

Woe, woe and thrice woe!

[vinteuil]

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3rd successive day in which the fells hereabouts are more or less dawn to dusk invisible under thickening cloud / fog / yuk / dreich.

... I sometimes wonder if DracoM is taking seriously his position at the Pennines Tourist Board


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[eighthobstruction]

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... I sometimes wonder if DracoM is taking seriously his position at the Pennines Tourist Board


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