The Weather Outlook

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Jiries
10 May 2025 20:36:49

later stages of ECM and supported by mean do suggest some serious heat pumping up, perhaps

Originally Posted by: The Beast from the East 

No thanks if this a heat spike happy with the current low to mid 20's and carry on to the summer at moderate warmth to 28-32C like in 2018.  At the moment we not getting any heat spike due to exceptional wet and cooler weather in Spain our main source of heat so we only getting home grown warmth up to mid 20's under May sun position as in July.

DEW
  • DEW
  • Advanced Member
11 May 2025 07:19:11
GFS Op 00Z; Britain esp the south currently in shallow trough between HPs on Atlantic and in Scandinavia. The trough drifts away SW-wards as high pressure re-establishes over N Scotland Tue 13th 1025mb and persists there, ridging to the rest of Britain until Tue 20th. The main centre then moves SW to mid-Atlantic, but pressure also remains high over nearby Europe so by Fri 23rd Britain is again in a trough (1005mb Dover) between two areas of HP. The two areas of HP then drift apart as pressure generally falls over Britain and a dartboard depression (remember them?) even appears Bristol Channel 970mb Tue 27th (but that's so far off that the chance of it happening is close to zero).

ECM;  much as GFS until Tue 20th when the HP system moves W into the Atlantic and pressure over Europe falls instead of staying high, net result is long-fetch NE-lies for Britain Wed 21st.

GEM; like ECM though HP is slower to move W-wards

GEFS; temps  a couple of degrees above norm in S, more than that in Scotland, until Tue 20th, mean then becoming cooler as ens members spread out. Good chance of a little rain in S & W in next few days, then generally dry until about Wed 21st when more substantial amounts appear in several but not all runs in most places. 


War is God's way of teaching Americans geography - Ambrose Bierce

Chichester 12m asl

Taylor1740
11 May 2025 09:05:56
Looking like around the 21st when this pattern might finally break, just in time for the BH weekend.
NW Leeds - 150m amsl
Brian Gaze
11 May 2025 09:52:14
Tomorrow could be very interesting if UKV is on the money.

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Brian Gaze

Berkhamsted

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Hungry Tiger
11 May 2025 09:57:27

Wow, GFS 6z is just a high pressure fest virtually from start to finish.

Here, I've recorded just 8mm of rain since 1st March. This is an exceptionally dry period.

Interestingly though, grass everywhere is still lush green, perhaps testament to the ground water levels after an extraordinary wet late Autumn and early winter.

Originally Posted by: moomin75 

Incredible dry spring this is turning out to be. 

:-o  🙂 


Gavin S. FRmetS.

TWO Moderator.

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South Cambridgeshire. 93 metres or 302.25 feet ASL.



DEW
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11 May 2025 10:48:00

GFS Op 00Z;  ...

The two areas of HP then drift apart as pressure generally falls over Britain and a dartboard depression (remember them?) even appears Bristol Channel 970mb Tue 27th (but that's so far off that the chance of it happening is close to zero).

Originally Posted by: DEW 

As expected, this deep LP has gone from the 06z. Instead we have 990mb Wales Thu 22nd, and moving up the W coast from there.


War is God's way of teaching Americans geography - Ambrose Bierce

Chichester 12m asl

Brian Gaze
11 May 2025 20:14:44
Still looks like there could be some fun and games tomorrow. UKV has been quite consistent in recent runs.

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Brian Gaze

Berkhamsted

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sunny coast
11 May 2025 21:15:48
Thunder and lightning here at Eastbourne now at 10pm and a sudden brief downpour not amounting to much tho by looks of radar

DEW
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12 May 2025 07:24:42
WX charts back up this morning. Temps in week 1 show a cold plunge over E Europe, elsewhere near norm; in week 2 E Europe warms markedly with some quite high temps for the E Baltic, not much change otherwise. Britain stays a little above norm and the last of the freezing isotherm disappears from N Russia. Very dry in week 1 for countries around the N Sea, then in week 2 something not seen for some time - Britain as a focus for an area of rain; also some in N Italy and Balkans.

GFS Op 00z; current trough mainly affecting England drifting away to SW as pressure rises over Scotland (Shetland 1030mb Wed 14th) and ridging to rest of Britain; holding this position to Tue 20th when HP moves towards Iceland and LPs from Biscay and Atlantic combine to form a centre 1005mb S Ireland Thu 22nd. LP from the Atlantic moves in slowly to take over, similar central pressure and position but with trough now extending towards Scotland Tue 27th, with areas of HP to SW and SE of Britain.

ECM: Differs from GFS after Tue 20th - the ridge of HP moves SE-wards as a whole, no LP over Biscay, large but slack LP forming E of Greenland 995 mb Thu 22nd and no LP over Biscay. This model thus continues the dry weather unlike GFS & WX.

GEM: like ECM. The LP on Thu 22nd is deeper and closer, 985mb S of Iceland

GEFS: temps slightly (in the S) or definitely (in the N) above norm with good ens agreement to Tue 22nd then mean declining to norm as ens members spread out, op and control going in different directions. Some ens members show rain in S & W from Mon 21st, rather more do so generally from Wed 23rd. Today's showers offer minimal amounts on the GEFS chart but may be heavy locally.


War is God's way of teaching Americans geography - Ambrose Bierce

Chichester 12m asl

Matty H
12 May 2025 10:14:18

Tomorrow could be very interesting if UKV is on the money.

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Originally Posted by: Brian Gaze 

Why do the UKV maps look like they’ve been drawn with a blunt crayon by a blind 3 year old?


Yate, Nr Bristol

TBFTEIARBSC

Brian Gaze
12 May 2025 10:30:19

Why do the UKV maps look like they’ve been drawn with a blunt crayon by a blind 3 year old?

Originally Posted by: Matty H 

😂😂I think it's a combination of their resolution and the way Matplotlib handles them. The Arome charts could be even more fun.


Brian Gaze

Berkhamsted

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DEW
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13 May 2025 07:14:46
WX temps show the cold plunge which is currently affecting E Europe retreating N-wards, and some very warm weather developing over France and Germany in week 2.  Some of this warmth may creep into SE England but Britain mostly staying a little above norm. Pptn forecast confirms yesterday's chart: very dry around the N Sea in week 1, in week 2 area of rain from Atlantic covering Britain (esp the S) and France but unlike yesterday, less rain in N Italy (and what there is connects back to France).

GFS Op 00z; current HP moving north to a position centred between Scotland and Iceland but ridging S-wards to affect the rest of Britain and persisting there until Wed 21st. It then slips SW-wards as LP develops near Greenland and moves to be centred N Scotland 985mb Sat 24th. Pressure remains low over the Atlantic with LP 1000mb approaching W Ireland Thu 29th. (Note ; this doesn't match WX which is however presenting the output dated Mon 12th, at which time GFS was predicting LPs crossing England rather than Scotland and - EDIT - on reflection, today's GFS looks rather like yesterday's ECM)

ECM; agrees with GFS

GEM; this model stays with the idea of LP running further south towards Ireland Wed 21st and into Biscay Fri 23rd with trough across England linking to Scandinavia

GEFS; Fri 23rd appears to be the pivot day. Until then temps a little (in the S) a lot (in the N) above norm with moderately good ens agreement, and dry apart from from some showery rain today. After the 23rd mean temp is near norm but with bigger spread of ens members and significant rain appearing in an increasing number of runs though smaller amounts in the E. 


War is God's way of teaching Americans geography - Ambrose Bierce

Chichester 12m asl

Brian Gaze
13 May 2025 17:28:37
Big change next week? I wouldn't rule it out because there has been more variability in the model output during this period.

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Brian Gaze

Berkhamsted

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Hungry Tiger
13 May 2025 19:23:03

Big change next week? I wouldn't rule it out because there has been more variability in the model output during this period.

UserPostedImage

Originally Posted by: Brian Gaze 

😵😵😵😵


Gavin S. FRmetS.

TWO Moderator.

Contact the TWO team - [email protected]

South Cambridgeshire. 93 metres or 302.25 feet ASL.



Hungry Tiger
13 May 2025 19:25:29

No thanks if this a heat spike happy with the current low to mid 20's and carry on to the summer at moderate warmth to 28-32C like in 2018.  At the moment we not getting any heat spike due to exceptional wet and cooler weather in Spain our main source of heat so we only getting home grown warmth up to mid 20's under May sun position as in July.

Originally Posted by: Jiries 

This present stuff is perfect. 22 to 24C and slate blue skies and a nice breeze 👌 😌 💙 


Gavin S. FRmetS.

TWO Moderator.

Contact the TWO team - [email protected]

South Cambridgeshire. 93 metres or 302.25 feet ASL.



NMA
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14 May 2025 07:02:04

Big change next week? I wouldn't rule it out because there has been more variability in the model output during this period.

UserPostedImage

Originally Posted by: Brian Gaze 

That's interesting because I'm sure someone here a few days ago was suggesting the 21st of this month was the next chance to put this drought out of its misery. This dry spring is drier than 1976 which is something. A dry summer after this spring  would be taking us into uncharted territory politically and environmentally.


Vale of the Great Dairies

South Dorset

Elevation 60m 197ft

Brian Gaze
14 May 2025 07:12:40
Hopefully we're seeing the baton being passed to the Azores HP and the (possible) changeable spells will be short-lived, at least in the south. 

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Brian Gaze

Berkhamsted

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DEW
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14 May 2025 07:13:14
WX temp charts - as yesterday, the cold pool over E Europe is being displaced by some very warm air from the SW, reaching Germany and Poland in week 2; today's chart also shows significant warming over England. But Iceland is still freezing! For week 1 rain in S and E Europe, dry around Britain and to the north. In week 2 still wet for Pyrenees and Alps; that in E Europe moves NE-wards - but more interestingly there is significant rain for Britain from the Atlantic, today's chart with a focus on Scotland rather than, as previously, on England.

GFS Op 00z; HP near Fair Isle 1030mb with broad ridge to Britain lasting to Mon 19th when it moves first to Greenland and then S-wards to mid-Atlantic. As the HP moves to the NW, LP over Baltic and France brings a spell of NE-lies around Wed 21st. Then as the HP moves to the S, LP develops near Greenland and moves to Britain, 990mb Bristol Sat 24th (not quite the horror show that Brian posted yesterday, but still quite a change). This LP moves SE-wards, leaving Britain in slack LP with another depression approaching Ireland from the west,  1005mb Fri 30th.

ECM; somewhat like GFS but tends to keep HP stronger; thus weaker NE-lies on Wed 21st, and LP still waiting its turn near Greenland on Sat 24th.

GEM; like ECM

JET; Omega block in place until Sat 24th when a locally strong streak appears over SW Britain , and Fri 30th, another streak stretching from NE USA to Portugal.

GEFS; mean temps close to norm with good ens agreement for the next fortnight, if anything slightly above norm for week 1 and slightly below week 2 (yes, this contradicts WX). Dry to Fri 23rd, then rain in most runs, quite large amounts in S & W, less in N & E.


War is God's way of teaching Americans geography - Ambrose Bierce

Chichester 12m asl

idj20
14 May 2025 08:28:06
Models still playing about with the idea of a pattern change before this month is out. Does tie in with the annual European Monsoon, though (yes, I do think that is an actual thing that usually occurs at end of May/start of June). 
Home location: Folkestone Harbour.
Ally Pally Snowman
14 May 2025 08:44:53
A more unsettled spell does look likely now in about 8 days time. How unsettled and how long it lasts unknown. 
Bishop's Stortford 85m ASL.
The Beast from the East
14 May 2025 09:09:28

That's interesting because I'm sure someone here a few days ago was suggesting the 21st of this month was the next chance to put this drought out of its misery. This dry spring is drier than 1976 which is something. A dry summer after this spring  would be taking us into uncharted territory politically and environmentally.

Originally Posted by: NMA 

It shouldn't though.  Since the autumn of 2022, we've had the wettest period down here anyway since records began. If all it takes is a few dry months to get us into crisis then it tells you something is badly wrong with our infrastructure 


Purley, Surrey, 70m ASL

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Saint Snow
14 May 2025 10:31:37

Hopefully we're seeing the baton being passed to the Azores HP and the (possible) changeable spells will be short-lived, at least in the south. 

UserPostedImage

Originally Posted by: Brian Gaze 

I'd much rather have the current set-up. Not only is it generally more stable, the AH generally brings inds from a westerly quadrant to MBY and its waxing and waning toward/over the UK allows weather systems to topple in over the top. You in the SE don't get that affected by this like we do in the west/north.

I'd always prefer the high centred over Scotland, just north of it or centred over the North Sea (the southern North Sea or Benelux) for warmer temps). Sadly, this is not a common set-up!!


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

Saint Snow
14 May 2025 12:38:32
ECM extended shows a very cool flow from the NNW for the last week of May. Would be a big shock to the system after the current beautiful spell of weather!


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

Chunky Pea
14 May 2025 12:54:14

I'd always prefer the high centred over Scotland, just north of it or centred over the North Sea (the southern North Sea or Benelux) for warmer temps). Sadly, this is not a common set-up!!

Originally Posted by: Saint Snow 

My preference also, Skies are bluer, sunshine is more golden and colourful (thanks to the lower humidity) and in winter, can deliver some proper frosts. 

I despise the Azores high. Often murky, but even if the murk breaks, the sunshine is ugly, glarish and colourless, with always a highly unpleasent feel to the air. 


Patrick,

East Galway, Ireland.

DEW
  • DEW
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14 May 2025 14:43:02

ECM extended shows a very cool flow from the NNW for the last week of May. Would be a big shock to the system after the current beautiful spell of weather!

Saint Snow wrote:

AIFS has LP parked over Britain from Sun 25th onwards, pulling in just those  cool NW-lies - is that what you were looking at?


War is God's way of teaching Americans geography - Ambrose Bierce

Chichester 12m asl

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