Tractor Boy
22 September 2017 08:44:48

A very good 21:55 forecast last night from Phil Avery, going to lengths to explain that most models keep the UK in battleground territory for next week between the Scandi high and the Atlantic fronts, whilst pointing out that the "American model" was showing a scenario with low pressure crossing the UK midweek, albeit an outlier.


This morning the big three show us in the battleground scenario (more unsettled in west, drier in east, south-easterly winds) at T+144


http://www.wetterzentrale.de/maps/GFSOPEU00_144_1.png


http://www.wetterzentrale.de/maps/UKMOPEU00_144_1.png


http://www.wetterzentrale.de/maps/ECMOPEU00_144_1.png


 


A bit later down the line the Scandi block holds but there are some indications of south-easterly diving lows breaking through, e.g.


http://www.wetterzentrale.de/maps/ECMOPEU00_216_1.png


http://www.wetterzentrale.de/maps/GFSOPEU00_216_1.png (with some tropical depressions on the conveyor belt upstream).


Dave
Farndale, North York Moors
Brian Gaze
22 September 2017 11:48:21

Early October looks pretty unsettled at the moment but of course in this set-up things could readily change.



Brian Gaze
Berkhamsted
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Hungry Tiger
22 September 2017 13:38:07

Originally Posted by: Cumbrian Snowman 

There is some snow cover already over Siberia

Keep an eye on this link over the next few weeks

http://www.natice.noaa.gov/pub/ims/ims_gif/DATA/cursnow_asiaeurope.gif



 


Those maps are excellent - Shows how in Eastern Siberia winter has already commenced.


 


Gavin S. FRmetS.
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South Cambridgeshire. 93 metres or 302.25 feet ASL.


DEW
  • DEW
  • Advanced Member
23 September 2017 19:18:19

First day-night average below zero showing up in next week's chart


http://www.wxmaps.org/pix/temp4.html


but it's still >38C in the Levant! 


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
Hippydave
23 September 2017 20:29:47

Both ECM and GFS showing unsettled weather pushing over the whole of the country Fridayish, with ECM managing to bring a former TS/Hurricane (I assume) over us at the end of its run for some mild n wild stuff.



Looks fairly set that October is going to start unsettled at this stage although still a bit of time for that to change. Whether the block to our East gives up or sticks around is debateable - could leave us very unsettled if it stays put but not close enough to bring settled weather, although that does also bring in the possibility of some very mild air being dragged up at times too. 


 


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briggsy6
24 September 2017 08:39:19

So what happened to our Indian Summer that I heard some people saying was on the way?


Location: Uxbridge
Shropshire
24 September 2017 10:23:05

Originally Posted by: briggsy6 


So what happened to our Indian Summer that I heard some people saying was on the way?



 


Horrific outlook with slow moving fronts giving potentially some incredible rain totals. 


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Gavin D
24 September 2017 10:54:36

Originally Posted by: Shropshire 


 


 


Horrific outlook with slow moving fronts giving potentially some incredible rain totals. 



Looks fairly normal for many


The Beast from the East
24 September 2017 11:02:09

Latest GFS still hasn't picked up the rapid bombing of Hurricane Lee. Instead the scandi blocks returns


 


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David M Porter
24 September 2017 11:07:33

Originally Posted by: Shropshire 


 


 


Horrific outlook with slow moving fronts giving potentially some incredible rain totals. 



Could you provide some back-up for that comment please, Ian?


Lenzie, Glasgow

"Let us not take ourselves too seriously. None of us has a monopoly on wisdom, and we must always be ready to listen and respect other points of view."- Queen Elizabeth II 1926-2022
Bolty
24 September 2017 11:20:35

A third very anticyclonic, easterly October on the trot?



Scott
Blackrod, Lancashire (4 miles south of Chorley) at 156m asl.
My weather station 
Shropshire
24 September 2017 14:38:01

Originally Posted by: David M Porter 


 


Could you provide some back-up for that comment please, Ian?



 


Sure, we have a set-up where High pressure to the East/NE is potentially blocking the transfer of systems  West to East. This combined with aggressive cyclogenesis in the warm Atlantic has the potential to give a lot of stalling rainfall over Western and Central areas as the fronts cannot progress past the Meridian. This is clearly highlighted from midweek onwards through to day 10 on the ECM.


From December 27th 2020, zonality will be banned from mixing with the UK. We appreciate that this may come as a shock to younger people and old Uncle Barty. This ban will last for a minimum of ten days.
David M Porter
24 September 2017 14:53:06

Originally Posted by: Shropshire 


 


 


Sure, we have a set-up where High pressure to the East/NE is potentially blocking the transfer of systems  West to East. This combined with aggressive cyclogenesis in the warm Atlantic has the potential to give a lot of stalling rainfall over Western and Central areas as the fronts cannot progress past the Meridian. This is clearly highlighted from midweek onwards through to day 10 on the ECM.



Assuming the ECM is proved to be correct in what it shows, that is.


Anyone who has regularly followed the ECM runs throughout the summer up to and including day 10 will know that more often than not recently, it has chopped and changed pretty regularly. For example, early last week it was indicating HP to our east building pretty strongly towards the UK and effectively blocking out the atlantic. Now it doesn't look as though that will happen.


For me, taking anything for more than a few days ahead as a given is very unwise.


Lenzie, Glasgow

"Let us not take ourselves too seriously. None of us has a monopoly on wisdom, and we must always be ready to listen and respect other points of view."- Queen Elizabeth II 1926-2022
Gandalf The White
24 September 2017 21:31:21

Originally Posted by: David M Porter 


 


Assuming the ECM is proved to be correct in what it shows, that is.


Anyone who has regularly followed the ECM runs throughout the summer up to and including day 10 will know that more often than not recently, it has chopped and changed pretty regularly. For example, early last week it was indicating HP to our east building pretty strongly towards the UK and effectively blocking out the atlantic. Now it doesn't look as though that will happen.


For me, taking anything for more than a few days ahead as a given is very unwise.



Agreed, David.  The verification stats suggest the models are broadly accurate out to T+120 but accuracy falls away sharply out to T+240. In unusual weather patterns I think it's inevitable that the accuracy levels will fall a little - a blocking pattern counts as unusual.


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130 metres ASL
52.0N 0.1E


doctormog
25 September 2017 07:08:15
http://www.wetterzentrale.de/maps/GFSOPEU00_180_1.png 

Based on a selection of model output it looks like things may get very unsettled in a week or so.

Wait for the inevitable “Britain to be battered by hurricane” nonsense in the tabloids.
Chunky Pea
25 September 2017 08:00:13

Originally Posted by: doctormog 



Wait for the inevitable “Britain to be battered by hurricane” nonsense in the tabloids.


 


Already had those headlines over here


http://www.msn.com/en-ie/weather/topstories/dublin-weather-hurricanes-maria-and-jose-head-towards-ireland-to-unleash-devastating-storms/ar-AAsi3GY?li=AAmb2oK&ocid=ientp


 


Current Conditions
https://t.ly/MEYqg 


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Arcus
25 September 2017 08:05:35
http://www.wetterzentrale.de/maps/GFSOPEU00_180_1.png 

Based on a selection of model output it looks like things may get very unsettled in a week or so.

Wait for the inevitable “Britain to be battered by hurricane” nonsense in the tabloids.


Indeed. Flicking through the GFS frames from 120 to 144 I found myself humming "The Wheels On The Bus".


Ben,
Nr. Easingwold, North Yorkshire
30m asl
Charmhills
25 September 2017 10:02:25
http://www.wetterzentrale.de/maps/GFSOPEU00_180_1.png 

Based on a selection of model output it looks like things may get very unsettled in a week or so.

Wait for the inevitable “Britain to be battered by hurricane” nonsense in the tabloids.


Indeed,


ECM 00z looking very unsettled and at times very wet for most.


Met/o 00z brings a brief ridge in on Saturday, no doubt it wont last long though.


Loughborough, EM.

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Duane.
Hungry Tiger
25 September 2017 10:33:34

Originally Posted by: Bolty 


A third very anticyclonic, easterly October on the trot?




I wonder how long that would have to persist before it started sending cold air in our direction.


 


Gavin S. FRmetS.
TWO Moderator.
Contact the TWO team - [email protected]
South Cambridgeshire. 93 metres or 302.25 feet ASL.


doctormog
25 September 2017 11:06:33

Originally Posted by: Hungry Tiger 


 


I wonder how long that would have to persist before it started sending cold air in our direction.


 



Until today’s GFS run would have been a start? 


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