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Gavin P
20 January 2014 15:05:14

Hi all,


Here's today video update;


Low Pressure Stalling At The Weekend?


http://www.gavsweathervids.com


Lot's of cold rain or the potential for something a little more wintry?


Rural West Northants 120m asl
Short, medium and long range weather forecast videos @ https://www.youtube.com/user/GavsWeatherVids
Quantum
20 January 2014 15:46:30

Bloody hell, only just looked at the 6Z. Why isn't everyone screaming about Friday? Practically a nationwide snow event unless you live in the west!


Twitter: @QuantumOverlord (general), @MedicaneWatch (medicane/TC stuff)
2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
Russwirral
20 January 2014 15:48:28


Bloody hell, only just looked at the 6Z. Why isn't everyone screaming about Friday? Practically a nationwide snow event unless you live in the west!


Originally Posted by: Quantum 


.....


 


 


...... because i live in the west?


Russwirral
20 January 2014 15:50:35

Following on from Quantums post though... I wonder if this will develop into a slider low?


 


With the Colder air behind it, Ill be interested to see if the Warmer Isotherm snakes further on this run and the next.  This is how last years Sliders developed if im not mistaken.


Quantum
20 January 2014 15:52:28


Following on from Quantums post though... I wonder if this will develop into a slider low?


 


With the Colder air behind it, Ill be interested to see if the Warmer Isotherm snakes further on this run and the next.  This is how last years Sliders developed if im not mistaken.


Originally Posted by: Russwirral 


Well that scandi high sure is not budging, even if we don't get cold air this week (or next), it is good to have it there to disrupt the jet and eventually lead us to northern blocking of some sort. That 6Z run was pretty amazing though, it had several marginal events. And marginal events are great when they deliver unexpected snowfall. I suspect it will be gone on the 12Z though. 


Twitter: @QuantumOverlord (general), @MedicaneWatch (medicane/TC stuff)
2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
Quantum
20 January 2014 15:54:34


Azores being a pain on GFS - But Scandi wants to get bigger.


1055 at one point for Scandi.


http://www.jp2webdesign.co.uk/ds/gfs.htm


Originally Posted by: Hungry Tiger 


Wrg to the azors one thing that I always look out for is the azors splitting to give a ridge on its nwern flank. When that happens it signals the start of southerly winds on its western side, which amplify the high in this part of the atlantic and send it towards greenland. 


http://cdn.nwstatic.co.uk/gfsimages/gfs.20140120/06/138/h500slp.png


You can see the begginings of this split already.


 


Twitter: @QuantumOverlord (general), @MedicaneWatch (medicane/TC stuff)
2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
Russwirral
20 January 2014 16:02:18



Following on from Quantums post though... I wonder if this will develop into a slider low?


 


With the Colder air behind it, Ill be interested to see if the Warmer Isotherm snakes further on this run and the next.  This is how last years Sliders developed if im not mistaken.


Originally Posted by: Quantum 


Well that scandi high sure is not budging, even if we don't get cold air this week (or next), it is good to have it there to disrupt the jet and eventually lead us to northern blocking of some sort. That 6Z run was pretty amazing though, it had several marginal events. And marginal events are great when they deliver unexpected snowfall. I suspect it will be gone on the 12Z though. 


Originally Posted by: Russwirral 

at 96hrs and it already looks more like a slider.


The Beast from the East
20 January 2014 16:20:40

http://modeles.meteociel.fr/modeles/gfs/runs/2014012012/gfsnh-0-156.png?12


No easterly at all from GFS and UKMO but ironically colder uppers coming in from the north west. At least both have the arctic high


"We have some alternative facts for you"
Kelly-Ann Conway - special adviser to the President
Ally Pally Snowman
20 January 2014 16:42:01
Many areas to see some snow if the GFS has it right. As early as Thursday. More snow the following Monday as well


http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=ukuk&MODELL=gfs&MODELLTYP=1&BASE=-&VAR=weas&HH=78&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD= 
Bishop's Stortford 85m ASL.
LA2B MeridFlowEuro09
20 January 2014 16:56:50
Fantastic GFS 12z run.

Winter Low Pressure expected to land across the UK by T144hrs, and it is seaming to bring Very Cold air from SE Newfoundland and NW N Atlantic, with Ridging northwards the Western Central N Atlantic high to it's West and SW.

Another Mergeable Two Low's over NE Newfoundland after it affects the UK from N and NW With a Greenland High it blocks the E Canada high and another slow moving PV Low that brings WAA so they weigh it in Cold in North and NW but warm to the SE there over Newfoundland SE Canada etc.

At 72 and 120h Energy with SE diving low pressure while Pressure builds over Greenalnd and Norwegian Sea and the Scandy N and nE Europe Blocking high remains strong.

As the UK gets a wedge of mild air with the arrival of that nor'easter low Storng West and NW Winds next Sunday expected, and Mimday brings Cold and a Wintry weather for UK courtesy of the NW and N Atlantic Low that moves SE wards, Tuesday a bit less cold in the Central part of the Storm, by Wednesday it turns colder again with West Mid N Atlantic high ridge to its West and Pressure holding high over Greenland cold North then NE winds likely to bring showers turning to sleet and hail or snow, with lower level rain maybe!.

I look forward to the next 5 to 7 days of model output discussion for the above UK weather prediction hopecasting.

Aha, also to say it is great to see High pressure about surrounding that Winter low for the UK next week and from next Sunday, to the NE and West and North.
Climate is warming up, Scotland and N Ireland and North England still often gets some Winter frost, ice and snow, November to March, but the SE and South UK including S Central England and Wales, together with the West and North through the year, they sometimes get more rain than London and S SE England, where some longer dry fine spells without much heavy rain is seen every year.

The North Atlantic Sea often gets some much Colder Wintry conditions from November to March Months, and Mild SW and South winds tend to be more frequent over the East and SE of North Atlantic Sea, as the Azores High tends to stay in charge. 

With this warmth and heat, the Central and South UK has become mostly free of snow and frost.
ARTzeman
20 January 2014 17:00:07

Hooray for the expected change in the charts. .Bound to happen soon..






Some people walk in the rain.
Others just get wet.
I Just Blow my horn or trumpet
idj20
20 January 2014 17:02:46

Not so keen on the storminess between 26th to 28/29th associated with a deepening Icelandic low pressure centre.

I think the GFS should be renamed as FGS (For God's Sake).

I guess now that it's all slipping into the "reliable" 7 to 10 days time frame, there's not much point in hoping for downgrades, etc? I know we should expect this kind of thing most winters but even so, this will be one storm system too many.


Folkestone Harbour. 
LA2B MeridFlowEuro09
20 January 2014 17:07:22

Hooray for the expected change in the charts. .Bound to happen soon..

Originally Posted by: ARTzeman 




Lol the the M.O. discussion fanfare, the parades by GFS and the others, Swinging Graphs, flip and flop.

Not many defectors away from but the crowd of wishful and those of us hearing us say what we see or get but there is some.

Put up your hands say what you will but there are many many days to go, we have the parades the crowds and the cheer.

It we get this right then I hope many more successes will follow this trip!to Winter Wonderland this winter for London and
The UK.
Climate is warming up, Scotland and N Ireland and North England still often gets some Winter frost, ice and snow, November to March, but the SE and South UK including S Central England and Wales, together with the West and North through the year, they sometimes get more rain than London and S SE England, where some longer dry fine spells without much heavy rain is seen every year.

The North Atlantic Sea often gets some much Colder Wintry conditions from November to March Months, and Mild SW and South winds tend to be more frequent over the East and SE of North Atlantic Sea, as the Azores High tends to stay in charge. 

With this warmth and heat, the Central and South UK has become mostly free of snow and frost.
ARTzeman
20 January 2014 17:17:12

Hooray for the expected change in the charts. .Bound to happen soon..

Originally Posted by: LA2B MeridFlowEuro09 

Lol the the M.O. discussion fanfare, the parades by GFS and the others, Swinging Graphs, flip and flop. Not many defectors away from but the crowd of wishful and those of us hearing us say what we see or get but there is some. Put up your hands say what you will but there are many many days to go, we have the parades the crowds and the cheer. It we get this right then I hope many more successes will follow this trip!to Winter Wonderland this winter for London and The UK.

Originally Posted by: ARTzeman 


 


  I want to be in the band when it happens..






Some people walk in the rain.
Others just get wet.
I Just Blow my horn or trumpet
LA2B MeridFlowEuro09
20 January 2014 17:34:59
The UKMO 12z Output looks Stormy at t144 hrs, by tomorrow this will go to t120h.

I suppose this sequence could evolve to bring a mix of rain and sleet to snow, maybe on Monday there would be plenty of heavy blustery and Squally showers as well as 50,60 to 70 mph gusts.

That monster Low crunches up next Saturdays low that brings rain across UK with moderate NW winds after Westerly's.

I had a look and I have to say that by next Sunday and Monday to Tuesday there will have been enough dry weather which should mean we can handle that Winter Severe Gale and Coastal Waves high tide maker PV Low UK Iceland Central and NE Atlantic system, but our nor'easter in the current forecast at least gives hope of us getting in on some winter Armageddon for god's sake if there is such a thing.

By that time many places will be ready for the Big Storm!.
Climate is warming up, Scotland and N Ireland and North England still often gets some Winter frost, ice and snow, November to March, but the SE and South UK including S Central England and Wales, together with the West and North through the year, they sometimes get more rain than London and S SE England, where some longer dry fine spells without much heavy rain is seen every year.

The North Atlantic Sea often gets some much Colder Wintry conditions from November to March Months, and Mild SW and South winds tend to be more frequent over the East and SE of North Atlantic Sea, as the Azores High tends to stay in charge. 

With this warmth and heat, the Central and South UK has become mostly free of snow and frost.
roger63
20 January 2014 17:38:42


http://modeles.meteociel.fr/modeles/gfs/runs/2014012012/gfsnh-0-156.png?12


No easterly at all from GFS and UKMO but ironically colder uppers coming in from the north west. At least both have the arctic high


Originally Posted by: The Beast from the East 


My take is that the pendulum has swung back to the Atlantic.


 In the short term ,the  stand off with the ScandI HP has the HP further east and earlier LP arrival.


In the medium term the 12h runs have a more zonal direction of travel with the slider LPs less clear cut.


I dont see much chancace of short term out to 96h being changed ,but the later slider LP  possibility still  has time to change.    

Stormchaser
20 January 2014 17:51:40

More of an Arctic High/Sliding Trough combination in today's output, but also signs of another troublesome burst of westerlies in 8-10 days time, which would need to be driven into the Continent to avoid annihalating the blocking to our NE.


I know the models often make a complete hash of Arctic Highs, sliding troughs and westerlies meeting blocks, so with all three in the mix, there is nothing in the model output that convinces me.


Nothing.


 




If you have any problems or queries relating to TWO you can Email [email protected]

https://twitter.com/peacockreports 
2023's Homeland Extremes:
T-Max: 30.2°C 9th Sep (...!) | T-Min: -7.1°C 22nd & 23rd Jan | Wettest Day: 25.9mm 2nd Nov | Ice Days: 1 (2nd Dec -1.3°C in freezing fog)
Keep Calm and Forecast On
roger63
20 January 2014 18:04:37


More of an Arctic High/Sliding Trough combination in today's output, but also signs of another troublesome burst of westerlies in 8-10 days time, which would need to be driven into the Continent to avoid annihalating the blocking to our NE.


I know the models often make a complete hash of Arctic Highs, sliding troughs and westerlies meeting blocks, so with all three in the mix, there is nothing in the model output that convinces me.


Nothing.


 




Originally Posted by: Stormchaser 


You mention another troublesome burst of westerlies in8-10 days time.


Thats refected in  12h  GEFS.


At 192h 60% of the ENS have a sinking LP with either easterlies or northerlies coming round the top.However that changes swiftly back to zonality with 75% zonal by 240h.

Ally Pally Snowman
20 January 2014 18:17:19
Cooler than average at the coldest time of the year surely we can get lucky and have at least one snow event?

http://www.wetterzentrale.de/pics/MT8_London_ens.png 
Bishop's Stortford 85m ASL.
Ally Pally Snowman
20 January 2014 18:40:24
Cold North West flow possible snow event in -5 uppers.

http://www.wetterzentrale.de/pics/Recm1682.html 
Bishop's Stortford 85m ASL.
JACKO4EVER
20 January 2014 18:40:56


http://modeles.meteociel.fr/modeles/gfs/runs/2014012012/gfsnh-0-156.png?12 
No easterly at all from GFS and UKMO but ironically colder uppers coming in from the north west. At least both have the arctic high

Originally Posted by: roger63 


My take is that the pendulum has swung back to the Atlantic.
In the short term ,the stand off with the ScandI HP has the HP further east and earlier LP arrival.
In the medium term the 12h runs have a more zonal direction of travel with the slider LPs less clear cut.
I dont see much chancace of short term out to 96h being changed ,but the later slider LP possibility still has time to change.

Originally Posted by: The Beast from the East 


Yes, I think your right Roger, the Atlantic now seems favourite to push through, but at no time will it be really mild. Some cooler days are to be expected at this time of year, but to be honest I don't see much in the way of snow apart from the favoured locations with elevaton up North. A glorious day of sunshine has been on offer here- a few more days like that would be most welcome, though sadly a few bouts of rain are more than likely.
Ally Pally Snowman
20 January 2014 18:42:32
JMA is an absolute stunner tonight wow!!!

http://www.meteociel.fr/modeles/jma.php?ech=192&mode=1 
Bishop's Stortford 85m ASL.
Russwirral
20 January 2014 18:46:08

JMA is an absolute stunner tonight wow!!! Originally Posted by: Ally Pally Snowman 

">http://www.meteociel.fr/modeles/jma.php?ech=192&mode=1


 


I think that requires some of these


 


 



Ally Pally Snowman
20 January 2014 18:49:18

JMA is an absolute stunner tonight wow!!! [url=http://www.meteociel.fr/modeles/jma.php?ech=192&mode=1

Originally Posted by: Russwirral 

]http://www.meteociel.fr/modeles/jma.php?ech=192&mode=1

Originally Posted by: Ally Pally Snowman 

[/url]

I think that requires some of these


UserPostedImageUserPostedImageUserPostedImageUserPostedImageUserPostedImageUserPostedImageUserPostedImageUserPostedImageUserPostedImageUserPostedImageUserPostedImageUserPostedImage



I would have put some on but on an IPad. One of the charts of the winter that's for for sure.

Bishop's Stortford 85m ASL.
Quantum
20 January 2014 18:53:34

So much northern blocking around, with loads of deep cold in russia. The atlantic is still being a spoilsport. It can't last forever though. 


Twitter: @QuantumOverlord (general), @MedicaneWatch (medicane/TC stuff)
2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
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