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idj20
27 February 2015 08:39:37


We are also at the time of year where solar heating comes into play so I would expect some heavy and possibly wintry showers across the south at times next week. Frost at night


Originally Posted by: Sevendust 



And I tend to be at the "lee side" of it all if the wind is coming in from the west. It does depend on how quickly or slowly the cold unstable airmass does get modified by the time that gets here, though.

But, indeed, after today's nice drop of sunshine, our weather is expected to be quite busy over the next few days but we have had worse (eg, last Winter), then hopefully high pressure start to take control before long.
  As Steve Gusty said elsewhere, Spring really cannot come soon enough as I'm done with this winter. Heck, I'm even looking forward to the lighter evenings associated with going onto BST! What is happening to me?


Folkestone Harbour. 
GIBBY
27 February 2015 08:43:26

HERE IS MY LATEST ANALYSIS USING DATA SUPPLIED BY THE NWP OUTPUT COVERING 5 OF THE WORLDS MOST POWERFUL WEATHER COMPUTERS.

THE CURRENT GENERAL SITUATION A ridge of High pressure crossing East over the UK today will be followed by troughs of Low pressure tonight and again later tomorrow on a strengthening SW flow.

http://www.wetterzen...cs/Rtavn001.gif

MODELS-2 WEEK HEADLINE Changeable and windy at first with rain at times and hill snow across the North. Becoming brighter and drier from the South later.

THE GFS JET STREAM ENSEMBLE FORECAST The Jet Stream Ensemble Forecast shows a strong West to East flow across the Atlantic slipping further South for a time early next week before weakening and breaking up near the UK next week at the same tine as ridging North over the Atlantic. The flow becomes somewhat weaker later though still trending across the Atlantic to the NW of the UK and sliding South over Britain on the Western flank of a block to the East and West of the UK

http://www.theweatheroutlook.com/twodata/datukgfshires.aspx?display=jetstream&model=gfs

GFS OPERATIONAL The GFS operational today shows a rather chilly and strong WNW flow across all areas following this weekends wind and rain. pressure slowly rises from the South and SW next week and after a brief turn of winds towards the North fine weather will develop across the South as a ridge crosses East. The North still lies under something of an Atlantic feed for a time before here to High pressure takes command later positioning just to the West of the UK with fine bright days for most and some overnight frost patches.

http://www.wetterzen...s/Rtavn1441.gif

http://www.wetterzen...s/Rtavn3841.gif
 
THE GFS CONTROL The GFS control run follows a similar track to that of the operational but holds Westerly winds across the UK rather longer with unsettled conditions continuing at least in the North into the second week before High pressure finally builds into these areas too with fine days and frost risk by night.

THE GFS CLUSTERS The GFS Clusters still revolve on the positioning of High pressure in relation to the UK and to what effect each position has on the surface conditions. Around 35% still show the Atlantic holding some influence in the shape of Westerly winds and rain at times while the remaining 65% all show High pressure influential either to the South, over or to the east of the UK.

http://www.weatheron...=0&WMO=&PERIOD=

UKMO UKMO this morning shows the cold and showery WNW flow early next week giving way to a strong ridge of High pressure building across the UK from the SW by next Thursday.

http://www.wetterzen...cs/Rukm1441.gif

THE FAX CHARTS The Fax Charts follow the raw data well with the weekends array of troughs gradually clearing to a showery Westerly flow with rising pressure from the South through next week.

http://www.weatherch...momslp.htm#t120.

GEM GEM looks ver like UKMO today in as much as pressure rises from the South on Day 6 to give fine weather for all following the early weeks cold and showery theme. Moving forward the model then holds High pressure close to Southern Britain maintaining fine conditions there while the North sees a slack Westerly flow with more cloud and perhaps a little rain in relatively mild air.

http://www.wetterzen...cs/Rgem2401.gif

NAVGEM NAVGEM too rises pressure from the South through the first half of next week with a ridge crossing east next Thursday followed by a slack Westerly flow over the North while High pressure stays close to the South in relatively fine conditions here.

http://www.wetterzen...cs/Rnvg1681.gif.

ECM ECM today also follows the pack albeit a little slower in reaching a similar conclusion. The ridge shown by all models next week is a little later and more hesitant from ECM as a further trough slips SE late next week before the main surge of High pressure lies across the UK to end the run with fine and settled weather for all by Day 10 with bright and probably sunny days in early Spring sunshine but widespread and locally sharp bight frosts.

http://www.wetterzen...cs/Recm2401.gif

ECM 10 DAY MEAN The 10 Day Mean Chart shows strong support for a High pressure belt to lie from the Azores across Southern Britain to Europe with a slack Westerly flow possble over Northernmost parts of Britain.

http://www.wetterzen...cs/Reem2401.gif

NOTABLE TREND CHANGES FROM PREVIOUS RUNS The trend towards drier and more anticyclonic weather later in the period remains this morning with just small nuanced differences in positioning of High pressure later.

31 DAY HISTORICAL VERIFICATION STATS FOR GFS, UKM & ECM The current verification statistics for the past 31 days shows ECM leading the way at 3 days with 97.5 pts followed by UKM at 97.2 pts and GFS at 96.4. At 5 days ECM  continues to lead the field at 90.1 pts over UKMO at 88.3 pts and GFS at 86.9. At 8 days ECM remains the leader with 66.3 pts over GFS's 60.4 pts. Then at Day 10 ECM retains superiority at 48.9 pts over GFS at 41.4.

http://www.emc.ncep....L_MSL_G2NHX.png

http://www.emc.ncep....L_MSL_G2NHX.png

http://www.emc.ncep....L_MSL_G2NHX.png

http://www.emc.ncep...._MSL_G2NHX.prig
 

MY THOUGHTS The models remain steady in their prediction of a change in the weather pattern from later next week as we finally lose the influence of the Westerly Atlantic feed of winds from the SW. There remains a phase of rather cold and showery weather to get through early next week which could give some wintry dustings of snow at times over higher ground following a spell of strong winds and rain over this weekend. This looks like giving way to a strong ridge of High pressure from next Thursday which should settle most areas into fine and dry weather with frost at night. From that point of time on differences in evolutions do begin to appear between the outputs all revolving on where High pressure lies but most (and I say this with high confidence) have it positioning close to Southern Britain. While on the face of it this seems a good thing as it takes away the threat of colder continental air getting into the UK on it's southern flank which now looks like taking place over Southern France instead it does maintain a drift from off the Atlantic on it's Northern flank which could introduce a lot more cloud across the UK at times and even a little rain still in the North. However, with this theory realised temperatures would be at least average by day and if cloud predominates frosts at night would become limited but all in all it is far too early to speculate on these sort of details which won't be nailed until the final positioning of the High is known. The one thing that is fairly certain this morning that given a week or so the weather will become fairly benign and settled for much of the UK with sunshine amounts and frost at night the talking points rather than wind, rain or snow.  

Issued at 09:00 Friday February 27th 2015


Martin G
Kilmersdon Radstock Bath Somerset



Look up my New Facebook Weather Page  for all the latest up to the minute weather stories as they happen
Charmhills
27 February 2015 10:07:54


We are also at the time of year where solar heating comes into play so I would expect some heavy and possibly wintry showers across the south at times next week. Frost at night


Originally Posted by: Sevendust 


Yes Dave that somewhat stronger sun are giving those showers an extra lift so to speak.


Loughborough, EM.

Knowledge is power, ignorance is weakness.

Duane.
Sevendust
27 February 2015 10:38:14


Yes Dave that somewhat stronger sun are giving those showers an extra lift so to speak.


Originally Posted by: Charmhills 


Morning Duane


Polar maritime air is useful by March. Even without the showers it's often sunny and you get some nice crisp starts like we had today


Easterlies are a waste of time in this area as we head into Spring unless you like it dull!

Gavin P
27 February 2015 13:50:39

Here's today's video update;


High Pressure March With JMA Friday;



Plenty of dry weather but temperatures might be variable.


Rural West Northants 120m asl
Short, medium and long range weather forecast videos @ https://www.youtube.com/user/GavsWeatherVids
LA2B MeridFlowEuro09
27 February 2015 17:32:37

 


Sunday heavy rain for most areas and the colder air will cross as we go over to Monday and Tuesday, Cold with frost widespread Wednesday for much of the Country.


Cold Mobile Westerly Uppers good with locally heavy Hail Snow rain and sleet showers with a plenty grouping up Trofs bring it, All areas affected Mon- Wednesday.


Will it turn less cold on Thursday yes will bring us A Azores High to UK.  Following Friday Colder with moderate NW flow with another classic frost at night.


😟💦👏


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.
Stormchaser
27 February 2015 23:42:29

Could be a good bit of variation to the coming week; wintry to Wednesday but perhaps feeling more like mid to late April for a time this weekend as we once again see strong LP development in the western N. Atlantic scooping up a huge wedge of subtropical air and throwing it our way.


This has been a common theme these past few months, with frequent plunges of deep cold across large areas of the U.S.  - so it's been like taking last winter and shifting the main storm development zone a thousand miles or so west.


It could serve us some exceptional warmth at times next month if the pattern persists. Obviously the intensity of the U.S. cold will soon start to fall markedly as the increased solar insolation makes itself felt, so we can't be looking to that mechanism for all that much longer. Hopefully it will evolve into an adjusted version of last spring through summer, in which the main area of suppressed Atlantic SSTs is further west than it was last year (at that time it was often between the Azores and the UK), encouraging LP development further west, allowing the fine, dry spells to be even longer lasting but not entirely unbroken (need a few thunderstorms here and there) 


You see I have a (loose, unproven) theory that last winter's persistent intense cyclogenesis just west of the UK led to the development of colder than normal SSTs not far west of the UK which then encouraged LP development in that area through the spring and summer due to enhanced temperature gradients moving into the colder than normal region from the near-normal region to the south.


In light of which, if my feat of hopeful imagination above happens to verify, I'll be starting to take that theory quite seriously... cool


 


There I go wandering off topic again, I'm getting out of practise what with my recent near-hibernation following what has been a bit of a letdown these past few weeks relative to what once looked possible.


With some more interesting conditions to come next week, it should be easier to meet my usual standards again... here's hoping 


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

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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
LA2B MeridFlowEuro09
28 February 2015 00:24:05


Could be a good bit of variation to the coming week; wintry to Wednesday but perhaps feeling more like mid to late April for a time this weekend as we once again see strong LP development in the western N. Atlantic scooping up a huge wedge of subtropical air and throwing it our way.


This has been a common theme these past few months, with frequent plunges of deep cold across large areas of the U.S.  - so it's been like taking last winter and shifting the main storm development zone a thousand miles or so west.


It could serve us some exceptional warmth at times next month if the pattern persists. Obviously the intensity of the U.S. cold will soon start to fall markedly as the increased solar insolation makes itself felt, so we can't be looking to that mechanism for all that much longer. Hopefully it will evolve into an adjusted version of last spring through summer, in which the main area of suppressed Atlantic SSTs is further west than it was last year (at that time it was often between the Azores and the UK), encouraging LP development further west, allowing the fine, dry spells to be even longer lasting but not entirely unbroken (need a few thunderstorms here and there) 


You see I have a (loose, unproven) theory that last winter's persistent intense cyclogenesis just west of the UK led to the development of colder than normal SSTs not far west of the UK which then encouraged LP development in that area through the spring and summer due to enhanced temperature gradients moving into the colder than normal region from the near-normal region to the south.


In light of which, if my feat of hopeful imagination above happens to verify, I'll be starting to take that theory quite seriously... cool


 


There I go wandering off topic again, I'm getting out of practise what with my recent near-hibernation following what has been a bit of a letdown these past few weeks relative to what once looked possible.


With some more interesting conditions to come next week, it should be easier to meet my usual standards again... here's hoping 


Originally Posted by: Stormchaser 


 


I quite liked the way you said all that, much parts made sense as well.


I have taken my observations that we and the USA North Atlantic and Pacific big picture it showed North South Two Cells link up Low's Mid November to Now close to W and over NW USA and in NE Pacific it dominated there, dragging mostly above Average Temperatures at NE Pacific to much of Alaska far West USA with a large series of warm episodes (Mild on some periods South USA and West to SW USA.


Some Low's moved across SW USA and NW USA numerous times especially in the middle winter period this winter, Bringing Cold Snowy conditions in Central N and Mid to East mid and NE USA.


The Siberian and Arctic High affected much of the West Central USA and there were medium or small Artcic Low Pressures often move SE from the NW off Greenland from the Canada and it's Artic Archipelago moving SE to go Over the West Central N USA High that also occurred regularly so the Arctic Low's affected NW and at times Central and more regularly NE USA, with the Low's in South and SW USA and Northwest and NE Gulf of Mexico tracking NE across South Central and Eastern mid NE USA at times which also helped the Cold Spells regularly establish and dominate long periods for them US people.


 


PFJ Southern Branch was very busy for us and the USA for in Especially more so Jamuary and February, though December was not differing much.


 


Heavy Snow for them was created by both the Weaker Northern Jetstream Arm with curvy west to east trajectory and the Wetter More both Warm mild at Southern Jetstream Branch for South midsection USA to East USA in Dec- Jan, but this I think was less active for half month in November 2014.


The North Atlantic Pattern as well as for North and NW Europe inc. South and West Central SW side of Europewas generally directly feeling the impact of the Jetstream as well as the Azores High influences to our UK and Wider Europe weather, talk big picture.


The Southern Arm of our Jetstream chased on and at times linked with the Northern Jet Branch this stopped parts of South SE Central UK to see not to lengthy cold or wintry showers of snow to occur.


January 2015 has been the colder month with December mixed with more frost than in February, quite a number of widespread night frosts occurred in January with at least upto 10 or 12 in December for Wanstead Area of London.


There was a frost last night at 0 deg. C, but I'm February not as much frosts as in December 2014.


The Low Pressure Systems in North Atlantic also dived regularly through NW Europe across West and South to Central and Also SE Europe at times, with Systems to North and NE Europe bring SW flow or NNW cold winds though some areas of High Pressure affected West NW and Central to East NE Europe which was likely helping to stop the Cold NNW SE tracks off North Atlantic to not really do it, therefore South Europe was often mild at times this winter.


final addition: There were quite a several occasions when Cold NW and a few Northerly flows via NW Europe brought significant snow sometimes for West South Central Europe quite widespread at times  


and brief NE Flows in Central W and mid South Europe. 


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.
Quantum
28 February 2015 03:32:29

Ensembles still showing the scatter, the possibility of the scandi high is lowering but it hasn't been dropped yet (I suspect this is why the metoffice is still offering both scenarios). I think its unlikely we will come back from this trend, but its still possible in theory. 


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.
Gusty
28 February 2015 08:07:24

Encouraging signals again today for a warm up in generally settled conditions from next weekend.


No chart available for the selected hour. Many charts start at 3 hours ahead, so if you have 0 hours selected try stepping forward or selecting a later hour.


ECM at 192 hours is warm sector looks akmost blowtorch next weekend...16/17c possible to the lee of high ground with charts like this.



Steve - Folkestone, Kent
Current conditions from my Davis Vantage Vue
https://www.wunderground.com/dashboard/pws/IFOLKE11 
Join Kent Weather on Facebook.
https://www.facebook.com/stevewall69/ 



GIBBY
28 February 2015 08:39:27

HERE IS MY LATEST ANALYSIS USING DATA SUPPLIED BY THE NWP OUTPUT COVERING 5 OF THE WORLDS MOST POWERFUL WEATHER COMPUTERS.

THE CURRENT GENERAL SITUATION
A moist SW flow will be invigorated by a deepening depression crossing East over Scotland tonight sweeping troughs East over all areas tonight and followed by a cold and showery Westerly flow tomorrow.

http://www.wetterzen...cs/Rtavn001.gif

MODELS-2 WEEK HEADLINE Changeable and windy at first with rain at times and hill snow across the North. Becoming brighter and drier from the South later.

THE GFS JET STREAM ENSEMBLE FORECAST The Jet Stream Ensemble Forecast shows a straightforward flow West to East motion to the South of the UK over the coming days before the general trend is for the flow to return Northwards later in the period in response to rising pressure from the South. The flow pattern over Europe remains complex and diffuse at times.

http://www.theweatheroutlook.com/twodata/datukgfshires.aspx?display=jetstream&model=gfs

GFS OPERATIONAL The GFS operational today shows a Westerly weather type continuing across the UK for much of this morning's output with the early week cold and showery theme followed by a ridge midweek before more unsettled and windy weather crosses West to East over the UK in the flow with a slow improvement to Southern areas later as High pressure gradually builds close to the South at the end of the run with rain bearing fronts then held more towards the NW.

http://www.wetterzen...s/Rtavn1441.gif

http://www.wetterzen...s/Rtavn3841.gif
 
THE GFS CONTROL  The GFS control run looks very similar in theme again only supporting any major improvements towards the South of the UK in the second half of the period as High pressure lies close to the South at times by then.

THE GFS CLUSTERS Not available this morning.

http://www.weatheron...=0&WMO=&PERIOD=

UKMO UKMO this morning shows the cold and showery WNW flow early next week giving way to a strong ridge of High pressure crossing East on Thursday before mild Atlantic Westerlies return to the North with High pressure just to the South of the UK then maintaining dry and fine weather over the South.

http://www.wetterzen...cs/Rukm1441.gif

THE FAX CHARTS The Fax Charts show a cold and showery start to next week with minor troughs sweeping West to east enhancing wintry showers at times in sub 528 dam air. A ridge is shown to be approaching from the West by Day 5.

http://www.weatherch...momslp.htm#t120.

GEM GEM today also shows the cold showery theme early in the period giving way to mild SW winds preceded by a ridge of High pressure. High pressure lies close to the South later in the period with rain bearing fronts affecting the North in strong winds at times while the South hold largely drier with limited affects of wind and troughs to the North.

http://www.wetterzen...cs/Rgem2401.gif

NAVGEM NAVGEM also shows a High pressure ridge following next weeks showers and cold air. Following on will be milder westerly winds for all with cloud and occasional rain in the North.

http://www.wetterzen...cs/Rnvg1681.gif.

ECM  ECM too follows the above theme well with milder Westerly winds replacing the cold Westerly early in the week spliced by a High pressure ridge midweek. Then later High pressure close to Southern Britain gradually extends a greater influence to all parts of the UK rather than just the South in relatively mild air..

http://www.wetterzen...cs/Recm2401.gif

ECM 10 DAY MEAN The 10 Day Mean Chart shows strong support for a High pressure belt to lie from the Azores across Southern Britain to Western Europe with a slack Westerly flow possible over Northernmost parts of Britain.

http://www.wetterzen...cs/Reem2401.gif

NOTABLE TREND CHANGES FROM PREVIOUS RUNS The trend towards drier and more anticyclonic weather later in the period remains this morning though with less influence at least innitially afforded to Northern areas.

31 DAY HISTORICAL VERIFICATION STATS FOR GFS, UKM & ECM The current verification statistics for the past 31 days shows ECM leading the way at 3 days with 97.6 pts followed by UKM at 97.2 pts and GFS at 96.4. At 5 days ECM  continues to lead the field at 90.2 pts over UKMO at 88.4 pts and GFS at 87.0. At 8 days ECM remains the leader with 66.4 pts over GFS's 60.6 pts. Then at Day 10 ECM retains superiority at 49.5 pts over GFS at 41.5.

http://www.emc.ncep....L_MSL_G2NHX.png

http://www.emc.ncep....L_MSL_G2NHX.png

http://www.emc.ncep....L_MSL_G2NHX.png

http://www.emc.ncep...._MSL_G2NHX.prig
 

MY THOUGHTS There is broad agreement on the procedure and theme of the weather over the next two weeks shared between the model outputs of all  this morning. The main theme focuses around the introduction of less unsettled and cold weather later next week as there now seems broad agreement that High pressure will set up shop close to the South of the UK likely over Northern France in a week or so. This would mean that the cold and showery theme of early next week gets replaced by drier and frosty weather before milder Atlantic winds bathe all areas by next weekend. With the High to the South the North still looks strongly affected by quite a stiff Westerly breeze dragging fronts and attendant rain at times across from the West. the South looks far less likely to see much affect from this though cloud amounts are likely to be large at times. then later in the run the trend os still for High pressure to extend more and more influence North to other areas too with probably more sunshine by then at times. Through the period I am more optimistic that temperatures could be average at worst later and indeed in the lee of Westerly winds and any brightness some Spring warmth could be accomplished in any tropical maritime air masses. So in general this morning as we move into meteorological Spring our rather inept Winter for many seems to be losing it's final effects in the shape of the cold Westerlies early next Week with something not unusual for early Spring developing across the UK in the shape of High pressure close to the South and SE and Low pressure well to the North.  

Issued at 09:00 Saturday February 28th 2015


Martin G
Kilmersdon Radstock Bath Somerset



Look up my New Facebook Weather Page  for all the latest up to the minute weather stories as they happen
Whether Idle
28 February 2015 09:10:42


Encouraging signals again today for a warm up in generally settled conditions from next weekend.


No chart available for the selected hour. Many charts start at 3 hours ahead, so if you have 0 hours selected try stepping forward or selecting a later hour.


ECM at 192 hours is warm sector looks akmost blowtorch next weekend...16/17c possible to the lee of high ground with charts like this.



Originally Posted by: Gusty 


Brilliant spot.  Here's hoping


Dover, 5m asl. Half a mile from the south coast.
tallyho_83
28 February 2015 10:35:11

I notice - no easterly that Darren Bett was forecasting a possibility of!? - He did mention there is a 60% chance of this by end of next week and for it to bring in NE winds!? - Very cold nights with frost and some wintry showers to eastern coasts.

Looks like zonal boring weather as always, so no change.


Home Location - Kellands Lane, Okehampton, Devon (200m ASL)
---------------------------------------
Sean Moon
Magical Moon
www.magical-moon.com


doctormog
28 February 2015 11:33:44


I notice - no easterly that Darren Bett was forecasting a possibility of!? - He did mention there is a 60% chance of this by end of next week and for it to bring in NE winds!? - Very cold nights with frost and some wintry showers to eastern coasts.

Looks like zonal boring weather as always, so no change.


Originally Posted by: tallyho_83 


 So NEly winds with wintry showers to eastern coasts and very cold nights = zonal? Bizarre! What you describe is almost as far from the definition of zonal conditions as you can get. Whether it happens or indeed whether it is boring are two entirely different issues. 


 


sizzle
28 February 2015 11:43:14

look on the bright side its the  1ST of MARCH tomorrow, that means  A NEW THREAD

tallyho_83
28 February 2015 11:48:58


 


 So NEly winds with wintry showers to eastern coasts and very cold nights = zonal? Bizarre! What you describe is almost as far from the definition of zonal conditions as you can get. Whether it happens or indeed whether it is boring are two entirely different issues. 


 


Originally Posted by: doctormog 


Not me, but Darren Bett described that it's a possibility during his week ahead forecast - There is a 60% chance of the high pressure pushing north bringing in colder easterly winds with some very cold nights.


Home Location - Kellands Lane, Okehampton, Devon (200m ASL)
---------------------------------------
Sean Moon
Magical Moon
www.magical-moon.com


doctormog
28 February 2015 11:58:35


 


Not me, but Darren Bett described that it's a possibility during his week ahead forecast - There is a 60% chance of the high pressure pushing north bringing in colder easterly winds with some very cold nights.


Originally Posted by: tallyho_83 


My point was that such conditions as you described (re. Darren Bett's forecast) are not zonal.


tallyho_83
28 February 2015 12:43:38


 


My point was that such conditions as you described (re. Darren Bett's forecast) are not zonal.


Originally Posted by: doctormog 


Oh - that~! - I was referring the the gfs - shows a return to zonal westerly's? - look at below chart? - different to what Darren Bett was saying hence my "Return to zonal."


 



 


 


Home Location - Kellands Lane, Okehampton, Devon (200m ASL)
---------------------------------------
Sean Moon
Magical Moon
www.magical-moon.com


Quantum
28 February 2015 13:55:17

Hi all. I've improved the methodology of my snow risk maps. Part of the issue was that they do seem to somewhat underestimate precipatation, so I have recalibrated and implemented a slightly different methodology. I am looking to further improve the maps in this respect, although that looks more likely to be next winter. I am also looking to write some integrated probability maps to give a snow risk over multiple 3 hours. Anyway V2 is here anyway. And this is your snow risk for 12-3pm on Sunday, Monday, Tuesday and Wednesday.






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
28 February 2015 14:42:04

You have got to be kidding me.



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.
Whether Idle
28 February 2015 18:53:18


You have got to be kidding me.



Originally Posted by: Quantum 


Go Sheffield!


Dover, 5m asl. Half a mile from the south coast.
Saint Snow
28 February 2015 21:02:36



Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
"How can wealth persuade poverty to use its political freedom to keep wealth in power? Here lies the whole art of Conservative politics."
Aneurin Bevan
Stormchaser
28 February 2015 21:05:55

With any luck the first half of March will have something attractive for many of us; snow showers for the first half of next week and pleasant warmth at some point this weekend, perhaps even extending into the following week.


I am keeping an eye on what is a very strong signal for a large positive height anomaly to develop over NW Europe by mid-month, orientated well for importing unusually warm airmasses to the UK. Most recent GFS op runs have reflected this in one way or another, with the 12z managing to edge up towards the high-teens by day late in the run thanks to air being drawn up from the subtropics.


 


By contrast, the potential for snow showers Monday and Tuesday continues to be of some interest, though I have been made more skeptical of the potential down here by the fact that although TWO's chart viewer shows snow for the middle part of Monday, some other chart viewers out there show rain.


 


In my book, a great spring has some hefty snow showers or a dump of snow overnight in March, some intense downpours in April (achieved very nicely last year) and some toasty afternoons in May.


What I'm wondering is, what are the odds of managing at least the first two of those in March alone... 


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Jezd
  • Jezd
  • Advanced Member
28 February 2015 23:19:33


You have got to be kidding me.



Originally Posted by: Quantum 


 


Very good, just what we need - more snow!! lol :-) 


Dungworth, Sheffield S6 - 250m asl
Snow, snow and more snow!
GIBBY
01 March 2015 08:35:44

HERE IS MY LATEST ANALYSIS USING DATA SUPPLIED BY THE NWP OUTPUT COVERING 5 OF THE WORLDS MOST POWERFUL WEATHER COMPUTERS.

THE CURRENT GENERAL SITUATION
A cold and showery Westerly airflow will cover the UK through the period with minor troughs swinging East in the flow enhancing spells of rain or showers, wintry in places.

http://www.wetterzen...cs/Rtavn001.gif

MODELS-2 WEEK HEADLINE
Changeable and showery to begin before becoming more settled and milder later.

THE GFS JET STREAM ENSEMBLE FORECAST The Jet Stream Ensemble Forecast shows the flow blowing strongly West to East just to the South of the UK for the first days of this week. Thereafter, the flow weakens somewhat and moves North to lies on a more SW t NE flow to the NW of Scotland later in the week and thereon.

 http://www.theweatheroutlook.com/twodata/datukgfshires.aspx?display=jetstream&model=gfs

GFS OPERATIONAL The GFS operational today shows a cold Westerly flow across the UK for the early days of this week with wintry showers. All the while pressure will be gently rising from the South and by later in the week High pressure will lie close to the South with milder winds wafting down across the UK on a little rain for a time. Thereafter, High pressure takes firm control of the weather over the UK with fine and settled weather with sunny spells for many with patchy night frosts. The far NW may be cloudier at times with a little rain as troughs brush by to the North but the pattern remains persistent until the end of the period.

http://www.wetterzen...s/Rtavn1441.gif

http://www.wetterzen...s/Rtavn3841.gif
 
THE GFS CONTROL  The GFS control run also shows High pressure taking control over and near the UK in the second week with a somewhat slower path to this than the operational run though with a somewhat warmer end to the run as High pressure slips to the east and feeds a mild sourced Southerly up across the UK.

THE GFS CLUSTERS The GFS Clusters are not available at time of publish of this report again this morning but the latest available run from ECM's 12z run of yesterday suggests High pressure close to Southern England in 10 days time.

http://www.weatheron...=0&WMO=&PERIOD=

UKMO UKMO this morning shows a NW/SE split setting up in the weather later this coming week with mild SW winds everywhere with rain at times in the NW with dry and fine weather for many in the South and East with a lot of cloud at times.

http://www.wetterzen...cs/Rukm1441.gif

THE FAX CHARTS The Fax Charts show a cold and showery start to the week with rising pressure from the South and a ridge of High pressure crossing East followed by milder SW winds and weak troughs from the NW later on affecting principally the North within the timeframe.

http://www.weatherch...momslp.htm#t120.

GEM GEM today also shows the cold showery theme early in the period giving way to mild SW winds preceded by a ridge of High pressure. High pressure lies close to the South later in the period with rain bearing fronts affecting the North in strong winds at times while the South holds mostly dry and mild conditions with variable cloud and reasonable temperatures especially by day under High pressure just to the South.

http://www.wetterzen...cs/Rgem2401.gif

NAVGEM NAVGEM also shows High pressure building strongly just to the South of the UK late in the week with fine and mild conditions here and cloudier conditions with more wind and a little rain possible in the far NW at times.

http://www.wetterzen...cs/Rnvg1681.gif.

ECM ECM too follows the above theme well with milder conditions taking hold for all from midweek. A spell of rain is shown to cross SE introducing the mild weather on Thursday before High pressure takes control over the South by next weekend and all areas later with an intense centre to the NE by the end of the run with a relatively mild and cloudy Easterly flow across the UK though probably with significant cloud cover.

http://www.wetterzen...cs/Recm2401.gif

ECM 10 DAY MEAN The 10 Day Mean Chart shows strong support for a High pressure to lie over and just to the east of the UK with fine and settled Springlike conditions for all.

http://www.wetterzen...cs/Reem2401.gif

NOTABLE TREND CHANGES FROM PREVIOUS RUNS The trend towards drier and more anticyclonic weather later in the period is continued within this morning's output.

31 DAY HISTORICAL VERIFICATION STATS FOR GFS, UKM & ECM The current verification statistics for the past 31 days shows ECM leading the way at 3 days with 97.6 pts followed by UKM at 97.2 pts and GFS at 96.4. At 5 days ECM  continues to lead the field at 90.3 pts over UKMO at 88.4 pts and GFS at 87.1. At 8 days ECM remains the leader with 66.5 pts over GFS's 60.5 pts. Then at Day 10 ECM retains superiority at 49.8 pts over GFS at 41.3.

http://www.emc.ncep....L_MSL_G2NHX.png

http://www.emc.ncep....L_MSL_G2NHX.png

http://www.emc.ncep....L_MSL_G2NHX.png

http://www.emc.ncep...._MSL_G2NHX.prig
 

MY THOUGHTS There is a possibility of an early taste of Spring shown within the models this morning. It is not a given though that there will be loads of blue sunny skies and high temperatures with much output suggesting something more cloudy or indeed overcast at times on a mild SW wind. However, there is total agreement that the current cold and showery Westerly is the last we will see for a while as mild winds topple round the Northern flank of a developing High pressure area close to the South of the UK late in this coming week. This may be accompanied by a short spell of light rain as the colder air is displaced on Thursday. Thereafter Southern areas look like becoming completely dry with variable amounts of cloud, some sunshine and temperatures quite respectable at least by day but under any clear and calm conditions at night slight frost and mist is possible. Northern areas may take rather longer to lose the influence of a SW moist flow with occasional rain but most output supports Northern areas too enjoying the quiet and settled conditions too later. ECM shows an intense High close to the NE later with a cloudy and grey Easterly in relatively mild air given the Easterly fetch while other output suggests a centre of High pressure closer to the East or South with mild winds sucked up across the UK. So all in all despite the cold start to March where some could see some snowflakes over the coming days a complete change in weather type is on the way with benign and relatively mild Spring conditions in light winds and variable cloud cover lasting for quite a while once established especially across the South.  

Issued at 09:00 Sunday March 1st 2015


Martin G
Kilmersdon Radstock Bath Somerset



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