UK meteorology

Autumn Rain
DH Lawrence

The plane leaves
fall black and wet
on the lawn;

the cloud sheaves
in heaven's fields set
droop and are drawn

in falling seeds of rain;
the seed of heaven
on my face

falling — I hear again
like echoes even
that softly pace

heaven's muffled floor,
the winds that tread
out all the grain

of tears, the store
harvested
in the sheaves of pain

caught up aloft:
the sheaves of dead
men that are slain
now winnowed soft
on the floor of heaven;
manna invisible

of all the pain
here to us given;
finely divisible
falling as rain.

Not from memory but Google Fu.
 
Rather than writing a lengthy explanation of what the models are showing for the next few days, I thought I'd quote a senior Netweather forum member (an ex-Met Office employee) from earlier today:

I'll keep this brief as I'm beginning to sound like a stuck record. Still differences in the medium term with the anomalies vis the orientation of the UK trough and the influence of the Azores HP in mid Atlantic where the ecm has a flatter more westerly upper flow. This will obviously impact the det. outputs so suffice it to say unsettled in this period with temps depressed but perhaps the high pressure taking closer order late in the period.

On to the here and now. today sees a cold front across the country tracking east so basically rain in the northern half of the UK and drier in the south. Tomorrow the low to the NW moves into Scotland so more wet weather there and elsewhere with fronts never far away.



Saturday midday sees the low 992mb in the North Sea leaving the UK in a showery north westerly airstream with the odd perturbation sneaking south in the western flank of the circulation. But after a very transitional ridge by 12 on Sunday the next low 977mb has arrived WNW of the Hebrides with the associated fronts and rain orientated Scotland/Wales/Cornwall with a strong westerly wind with gales in Wales and southern England, maybe even severe gale in exposed areas. Over the next 24hours the low tracks across Scotland into the North Sea thus veering the surface wind north westerly with frequent showers that will effect most areas, perhaps heavy and thundery.

A familiar story then ensues with some brief ridging before the next low and fronts arrive Tuesday evening portending some more very wet weather accompanied by gales with the strong jet running from the WNW straight over the UK

As you can work out from his comments, the short-to-medium range appears pretty unsettled, with the Jet shifting from flat zonal to more meridional and heading south, thereby bringing some fairly deep Atlantic depressions across the northern half of the country, although the wet and windy conditions will affect the south.
 
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A final burst of warmth.....and then thrown back into Autum, I shall make the most of that weekend :)
Emphasis on the "might" there, BM. It's still 9-10 days away, or, in weather model terms, T+216 to T+240 (the models go by hours from the time the run was initiated). Much can change over that period; even in the most stable and predictable of Northern Hemisphere set-ups, that's as far as you can predict forward with any degree of confidence from the output of deterministic models; at some point, the data points scatter, a moment at which meteorologists say that FI (Fantasy Island) has started. Essentially, Shannon Entropy, named after the man who described it, Claude Shannon, takes-over and uncertainty/disorder increases sharply as a consequence of Chaos Theory.
 
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