Brian Gaze
24 May 2020 12:38:16
I've just added the Icon Global model to TWO. Still in testing and may not update regularly for a few days.

The link is:

https://www.theweatheroutlook.com/twodata/icon-global.aspx 

Currently I'm only running the 00z and 12z updates because the 6z and 18z only go to 120 hours which is the same as the Icon EU model which is already available here:

https://www.theweatheroutlook.com/twodata/icon.aspx 
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
DEW
  • DEW
  • Advanced Member
25 May 2020 06:46:46

http://www.wxmaps.org/pix/temp4 fine and dry for this week with warmth notably in the south, but cooler and damper (not really wet) next week -looking rather as if the cold pool over central Europe is working its way towards us (see GFS below)


GFS: HP centred over UK all this week fed by warm air from the south but moving off to Norway with more of an easterly feed from Sat 30th. New HP then developing to the SW and moving up to Iceland by Sat 6th with a northerly flow. The LP over Norway providing that flow then settles over the UK and quite cool (the 552 dam line encircles the UK Wed 10th)


GEFS - this summary applies countrywide: doesn't pick up extra warmth as forecast on BBC and ECM, stays resolutely close to average to Fri 5th. The mean then still close to seasonal norm but op and control runs take a dip. Bits and pieces of rain from Mon 1st but nothing significant. 


ECM: similar pressure pattern but manages to draw up more warmth from the south this week.


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

Chichester 12m asl
Rob K
25 May 2020 15:21:09

Looking very dry again on the GEFS. The lawns and verges around here are already August straw colour and it’s not even June yet!


P13 is properly scorchio 


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." — Jerome K. Jerome
Bertwhistle
25 May 2020 15:41:25

Originally Posted by: Rob K 


Looking very dry again on the GEFS. The lawns and verges around here are already August straw colour and it’s not even June yet!


P13 is properly scorchio 



Yes I followed 13 through. Early June 1947 feel.


I only ever saw white-grass fields in May once- in 1989, and then it was patchy. 


Bertie, Itchen Valley.
'We'll never see 40 celsius in this country'.
DEW
  • DEW
  • Advanced Member
25 May 2020 18:34:07

Originally Posted by: Bertwhistle 


 


Yes I followed 13 through. Early June 1947 feel.


I only ever saw white-grass fields in May once- in 1989, and then it was patchy. 



Looks to me less settled at the weekend?


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

Chichester 12m asl
Rob K
25 May 2020 19:47:51

Originally Posted by: DEW 


 


Looks to me less settled at the weekend?



Yes a few ppn spikes starting about June 3 but generally looking pretty settled I think. 


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." — Jerome K. Jerome
Rob K
25 May 2020 21:58:04
ECM and GFS both wobbling this evening with a cool and unsettled spell in a week to 10 days’ time. GFS cold enough for snow over Scottish hills.
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." — Jerome K. Jerome
DEW
  • DEW
  • Advanced Member
26 May 2020 07:06:39

Jetstream starts off fragmented but mostly either north of UK or fading out before reaching us until Tue 2nd when the forecast resumes its dalliance with a major loop creating a cut-off low moving S from Ireland to Iberia. The main stream then resumes N of the UK but tending to run NW to SE down into the N Sea.


GFS shows HP over the UK to Sun 31st with warm air from the S. On Mon a significant LP develops NW of Ireland 990mb and runs S to Iberia by Sun 7th while HP re-establishes N behind it and moves over the UK.This HP does not persist and by Thu 11th slck LP covers the UK. The forecast for the first week of June thus matches the jetstream nicely but is quite different from yesterday! e.g. the cold spell at the end of yesterday's run is no longer there.


GEFS mean temps in the SE stay close to norm through to Thu 11th without too much scatter even later on (query: why isn't it picking up the warmth forecast in other models this week?) Dry to Wed 3rd, bits and pieces of rain thereafter. Scotland and the NW do manage some extra warmth this week and has a lot more uncertainty later; there is slightly more in the way of rain also starting earlier in Scotland Mon 1st.


ECM similar to GFS though the LP is less well defined at first.


Models may be in lockstep but still struggling with a consistent day-by-day pattern for more than a week ahead


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

Chichester 12m asl
Rob K
26 May 2020 14:54:03
GEFS showing quite a split from June 4 with a majority now showing a marked cooldown with some rain (London ensemble)
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." — Jerome K. Jerome
Ally Pally Snowman
26 May 2020 15:24:58

The pattern change still on for the 4th June


 


 


 



Bishop's Stortford 85m ASL.
Ally Pally Snowman
26 May 2020 17:50:40

GEM also joining the unsettled and cool start to June this was not in the script. Could blow a few long range forecasts out straight away.


Bishop's Stortford 85m ASL.
Ally Pally Snowman
26 May 2020 19:01:03

The ECM though keeps it warm and pretty settled out to day 10 very warm in the south. Looks like it would avoid the GFS type northerly. Excellent run 


Bishop's Stortford 85m ASL.
picturesareme
26 May 2020 19:03:05

Originally Posted by: Ally Pally Snowman 


GEM also joining the unsettled and cool start to June this was not in the script. Could blow a few long range forecasts out straight away.



Well the Met are on board..


"Confidence lowers during early June but signals show a shift to more changeable weather with a chance of showers or longer spells of rain across all parts. Despite the spells of wetter weather there will be some drier and brighter interludes for most. Temperatures likely closer to around average for many but perhaps staying warmer for some across the south."


"Warmer for some in the south" - to me that hints at predominant wind direction being from northerly quarter. Which when i last checked the models last night they had them coming from. :) 


Of course i imagine when it's piddling it down with winds in Scotland, or wet in the Midlands the metoffice will be getting slated on here. 

moomin75
26 May 2020 19:14:57

Originally Posted by: picturesareme 


 


Well the Met are on board..


"Confidence lowers during early June but signals show a shift to more changeable weather with a chance of showers or longer spells of rain across all parts. Despite the spells of wetter weather there will be some drier and brighter interludes for most. Temperatures likely closer to around average for many but perhaps staying warmer for some across the south."


"Warmer for some in the south" - to me that hints at predominant wind direction being from northerly quarter. Which when i last checked the models last night they had them coming from. :) 


Of course i imagine when it's piddling it down with winds in Scotland, or wet in the Midlands the metoffice will be getting slated on here. 


The Met Office change their forecasts on a near daily basis....I wouldn't read much into another flip. They just cover all bases over a number of days so that they can't be wrong. 


Witney, Oxfordshire
100m ASL
Bertwhistle
26 May 2020 19:37:13

Originally Posted by: picturesareme 


 


 Temperatures likely closer to around average for many but perhaps staying warmer for some across the south."


"Warmer for some in the south" - to me that hints at predominant wind direction being from northerly quarter. 



Not necessarily. Could just be higher pressure to the south; in any case there's a lot of uncertainty in the modeling atm.


Bertie, Itchen Valley.
'We'll never see 40 celsius in this country'.
picturesareme
26 May 2020 19:54:32

Originally Posted by: Bertwhistle 


 


Not necessarily. Could just be higher pressure to the south; in any case there's a lot of uncertainty in the modeling atm.



If you read the whole quote with my post you should have seen that they say "chance of showers or longer spells of rain across all parts" So high pressure is unlikely to be why it would be "warmer for (here is the key word) some across the south". 

Ally Pally Snowman
26 May 2020 19:54:35

Definitely a northerly influence on the ECM mean by day 10 . Up til then it's very warm and settled . Often predicted northerlies get pushed east so let's hope this happens again.


 


Bishop's Stortford 85m ASL.
picturesareme
26 May 2020 19:55:33

Originally Posted by: moomin75 


The Met Office change their forecasts on a near daily basis....I wouldn't read much into another flip. They just cover all bases over a number of days so that they can't be wrong. 



that's rich coming from you 

picturesareme
26 May 2020 20:03:10

Originally Posted by: Ally Pally Snowman 


Definitely a northerly influence on the ECM mean by day 10 . Up til then it's very warm and settled . Often predicted northerlies get pushed east so let's hope this happens again.


 



GFS has slack low pressure to our east, and high to our west with a largely N/NE air flow. This would probably bring showers to most central, northern, and eastern parts. Average temps across midlands and western parts. Cooler in eastern parts, and rather warm south of the M4 and west of Hasting, and the south west.

moomin75
26 May 2020 20:06:49

Originally Posted by: picturesareme 


 


that's rich coming from you 


Ah haha....Yes exactly the response I was expecting and deserve. 🤣🤣


Witney, Oxfordshire
100m ASL
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