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Rob K
03 December 2017 19:26:12


 


the south east would be buried under that 


Originally Posted by: Jayni C 


Can you get buried under rain?


 


ECM still doesn't want to get involved in any cold for the southern half of the country - two dry and chilly days and then cold and wet and soon turning a tad milder and wet. No thanks Reading. Try harder on the 00Z!


Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." β€” Jerome K. Jerome
doctormog
03 December 2017 19:27:42


TBH I think you need someone fairly clued up to decipher the actual surface conditions that ECM would bring.


It’s a fairly complicated setup and I’m not too sure myself. 


Just saying rain because uppers are above -5C could be too simplistic - although I’m not saying that scenario isn’t likely, I just don’t know. 


Originally Posted by: Joe Bloggs 


Yes, you’re right Joe. Simply put less cold uppers are needed in a continental flow but also to an extent when 500hPa heights are lower. Parameters such as 850-1000hPa partial thicknesses and dew point values are especially useful I find but they are not quickly available for the ECMWF charts.


Having said that I could post every parameter under the sun and Beast would still take the most dismissive negative view.  I can fully understand why but its not always objective.


Joe Bloggs
03 December 2017 19:29:25

For those who think ECM t+168 would bring rain... πŸ˜³πŸ˜³πŸ˜‰


https://weather.us/model-charts/euro/england/snow-depth-in/20171210-1800z.html


https://weather.us/model-charts/euro/england/temperature-f/20171210-1800z.html


 



Manchester City Centre, 31m ASL

White Meadows
03 December 2017 19:30:33
Slushy unless you’re below 80m elevation
Gandalf The White
03 December 2017 19:32:27


TBH I think you need someone fairly clued up to decipher the actual surface conditions that ECM would bring.


It’s a fairly complicated setup and I’m not too sure myself. 


Just saying rain because uppers are above -5C could be too simplistic - although I’m not saying that scenario isn’t likely, I just don’t know. 


Originally Posted by: Joe Bloggs 


As a rule in these slider-type situations the main dividing line is which side of the track of the LP you are.  Anywhere to the south and west is almost certainly going to see rain. Anywhere well to the east and north should get something wintry, especially with elevation. It also depends on how much the cold air gets mixed out by the turbulence of the approaching LP and trough, and conditions near the surface (snow cover). Even the timing of the arrival of the precipitation can matter: overnight frost then incoming cloud is preferable to the front arriving in the afternoon.


It's all a bit academic at this range but I'd guess you might be safe to draw a line from NE Scotland down towards the East Midlands and then to The Wash. East of that something wintry, especially with height. Anywhere else I'd guess cold rain with maybe transient sleet.


I may be overly optimistic - I wonder what Darren's view is?


Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


Joe Bloggs
03 December 2017 19:32:28

Actually, bin those snow depth maps - it is rain.


https://weather.us/model-charts/euro/england/significant-weather/20171210-1800z.html


πŸ˜‚


Fine details. 



Manchester City Centre, 31m ASL

Solar Cycles
03 December 2017 19:32:50


For those who think ECM t+168 would bring rain... πŸ˜³πŸ˜³πŸ˜‰


https://weather.us/model-charts/euro/england/snow-depth-in/20171210-1800z.html


https://weather.us/model-charts/euro/england/temperature-f/20171210-1800z.html


 


Originally Posted by: Joe Bloggs 

A whopping 8” for me going of that........ Oh Matron!😁

Polar Low
03 December 2017 19:34:10

As Darren has said before and I could kick myself for not saying it the important part with the sliders is to have south easterlies at the surface so that the low drags colder and drier air ahead. 


This has been said on the other side 

four
  • four
  • Advanced Member
03 December 2017 19:40:10


A whopping 8” for me going of that........ Oh Matron!😁


Originally Posted by: Solar Cycles 


Changing the filter to accumulation tells a different story.


Rob K
03 December 2017 19:42:01

I'm still struggling to see why the charts are showing lows "sliding" to the southeast when there is no block (either surface or upper) to the east to stop them heading on their usual track. What is steering the jet in the absence of a block?


Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." β€” Jerome K. Jerome
Whether Idle
03 December 2017 19:42:14


As Darren has said before and I could kick myself for not saying it the important part with the sliders is to have south easterlies at the surface so that the low drags colder and drier air ahead. 


This has been said on the other side 


Originally Posted by: Polar Low 


Are you in contact with the "dear departed"?


There's enough analysis on TWO, thanks!


 


Dover, 5m asl. Half a mile from the south coast.
Brian Gaze
03 December 2017 19:44:29


I'm still struggling to see why the charts are showing lows "sliding" to the southeast when there is no block (either surface or upper) to the east to stop them heading on their usual track. What is steering the jet in the absence of a block?


Originally Posted by: Rob K 


Was there much of a block in March 2013? I thought we had modest "steering" height rises to the north but I could be VERY wrong.


Brian Gaze
Berkhamsted
TWO Buzz - get the latest news and views 
"I'm not socialist, I know that. I don't believe in sharing my money." - Gary Numan
roger63
03 December 2017 19:45:18

Country file forecast not much detail on any snow but coastal showers mentioned and middle spine of country largely dry.Temps around 3-5c.S eems a bit of a downgrade compared to what GFS charts  are suggesting.

Arcus
03 December 2017 19:46:34


I'm still struggling to see why the charts are showing lows "sliding" to the southeast when there is no block (either surface or upper) to the east to stop them heading on their usual track. What is steering the jet in the absence of a block?


Originally Posted by: Rob K 


I'll say it again - lack of heights to the south is key.


Ben,
Nr. Easingwold, North Yorkshire
30m asl
Rob K
03 December 2017 19:49:45


Country file forecast not much detail on any snow but coastal showers mentioned and middle spine of country largely dry.Temps around 3-5c.S eems a bit of a downgrade compared to what GFS charts  are suggesting.


Originally Posted by: roger63 


when did a TV forecast ever show conditions as severe as a GFS chart? :)


Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." β€” Jerome K. Jerome
Whether Idle
03 December 2017 19:49:48


Country file forecast not much detail on any snow but coastal showers mentioned and middle spine of country largely dry.Temps around 3-5c.S eems a bit of a downgrade compared to what GFS charts  are suggesting.


Originally Posted by: roger63 


The professionals know their onions.  NWly, classically dry for the majority.  Wintry showers in prone areas, snow above 1000 feet. Cold couple of days then gradually less cold with risk of rain, snow on northern hills.  Typical winter fayre.


Dover, 5m asl. Half a mile from the south coast.
Joe Bloggs
03 December 2017 19:59:31


 


The professionals know their onions.  NWly, classically dry for the majority.  Wintry showers in prone areas, snow above 1000 feet. Cold couple of days then gradually less cold with risk of rain, snow on northern hills.  Typical winter fayre.


Originally Posted by: Whether Idle 


I’ve lived here long enough to know that a setup like this would deliver snow to inland areas, even if it isn’t very much. I appreciate it won’t necessarily snow in your area.


http://www.wetterzentrale.de/maps/GFSOPEU12_114_1.png


http://www.wetterzentrale.de/maps/GFSOPEU12_114_2.png


Without intending to sound arrogant I’m not sure why anyone would expect the Countryfile forecast to say anything different about a northerly flow at that range. “Wintry showers on the coast” is the obvious phrase. 


And I’m also not suggested that the above charts won’t change. They might. 



Manchester City Centre, 31m ASL

LeedsLad123
03 December 2017 19:59:48
BBC forecasts are always underwhelming this far out. Even when time gets closer to an actual event they tend to err on the side of caution. That's just how they operate.
Whitkirk, Leeds - 85m ASL.
Joe Bloggs
03 December 2017 20:01:17

BBC forecasts are always underwhelming this far out. Even when time gets closer to an actual event they tend to err on the side of caution. That's just how they operate.

Originally Posted by: LeedsLad123 


Indeed. 



Manchester City Centre, 31m ASL

doctormog
03 December 2017 20:01:36


 


The professionals know their onions.  NWly, classically dry for the majority.  Wintry showers in prone areas, snow above 1000 feet. Cold couple of days then gradually less cold with risk of rain, snow on northern hills.  Typical winter fayre.


Originally Posted by: Whether Idle 


Snow above 1000ft?  It looks colder than the northerly we just had. Did you put in an extra zero (or two)? Most of the charts show a substantial swathe of the country with a snow risk to essentially sea level. 


Rob K
03 December 2017 20:04:15


 


Snow above 1000ft?  It looks colder than the northerly we just had. Did you put in an extra zero (or two)? Most of the charts show a substantial swathe of the country with a snow risk to essentially sea level. 


Originally Posted by: doctormog 


True for GFS but definitely not for ECM. The "precip type" charts linked above showed "mixed rain and snow" at best for all in England except the highest hills of Yorkshire. 


Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." β€” Jerome K. Jerome
Gooner
03 December 2017 20:09:26


Country file forecast not much detail on any snow but coastal showers mentioned and middle spine of country largely dry.Temps around 3-5c.S eems a bit of a downgrade compared to what GFS charts  are suggesting.


Originally Posted by: roger63 


lol your getting a battering for this comment and rightly so , you should know better Rodg....Over the last few days I’ve watched you tube weather forecasts from snowy periods around the U.K.  The detail shown on a Sunday is nothing like what’s shown 5 days later....it’s impossible to be accurate 


 


you should know that


 


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


Joe Bloggs
03 December 2017 20:09:52


 


True for GFS but definitely not for ECM. The "precip type" charts linked above showed "mixed rain and snow" at best for all in England except the highest hills of Yorkshire. 


Originally Posted by: Rob K 


Based on their snow maps I’m not convinced by their output to be honest. 



Manchester City Centre, 31m ASL

Gooner
03 December 2017 20:10:29

BBC forecasts are always underwhelming this far out. Even when time gets closer to an actual event they tend to err on the side of caution. That's just how they operate.

Originally Posted by: LeedsLad123 


 


Spot on


 


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


Gooner
03 December 2017 20:11:47


 


The professionals know their onions.  NWly, classically dry for the majority.  Wintry showers in prone areas, snow above 1000 feet. Cold couple of days then gradually less cold with risk of rain, snow on northern hills.  Typical winter fayre.


Originally Posted by: Whether Idle 


on the recent output id put money on with you its snow to low levels


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


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