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Model Output Discussion - May and Early Summer!


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Extracts posted last week on closed thread:   The other part of the equation is the seasonal transition within the stratosphere from its winter default vortex position to its summer state. T

Greetings to you all! ? A glistening new thread for the month of May and early Summer! As we head deeper into Spring and into Summer (though I guess for some, May could be classed as a Summer

There are no apologies for self quoting a significant extract of the post the other day because its central focus becomes more primary to how NWP evolves in the remainder of this month and into the st

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2 minutes ago, Ed Stone said:

Methinks there'll be quite a few brass monkeys keeping their hands in their pockets, this weekend?:cold:

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Hopefully a 7 day itch Pete.... Things perhaps improving the following week! Oh by the way I'm a bit concerned by that 2nd chart.... How rude Mr GFS. ?

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It's actually not going to be a bad weekend for most, plenty of sunshine and if you can get out of the chilly breeze it will feel pleasant but slight overnight frosts too..could be worse.?

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Certainly a cold snap for the time of year on the ukmo 12h with air straight from the arctic (northern scotland bearing the brunt of it)  but on the plus side it's clean clear air with great visibility, some showers, mainly for counties bordering the north sea and for the far north where they will have a wintry flavour but plenty of strengthening early May sunshine to compensate for the cold nights with widespread frosts, the frosts  sharper outside of towns and cities.?

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Edited by Frosty.
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The 12Z gets off to a rather poor start and doesn't really get a whole lot better:

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And, a usual, Day 16 is nae too bad. So brass monkeys can finally refrain from pocket billiards!:oldgood:

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5 hours ago, Mattwolves said:

How can you fail to see a way out of the current output! Firstly the models may look completely different inside the next 24/48hrs, and secondly its the 1st of May! Alot of fine lengthy summers come on the back of cold/cool unsettled spells in late spring. It's hardly throw the towel in is it! I would be more worried if we was locked into a continued heatwave through May! For example it peaking to soon. This is a slight blip in what is sure to be a summer of many fine, very warm spells! Let's remember folks, it's the 1st of May, not the 1st of July! I thi k to many have got lulled into a false sense of security because of the last couple of very warm spells!! Let's not forget those spells were a tad premature! Refrain from towel throwing just yet folks..... Please!!! 

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I don't think my post was that extreme to suggest that I was throwing in the towel...but perhaps it did come across as being overly pessimistic.

I do really enjoy May as a month and last May was really stunning around these parts- we were spoiled. It would be a shame if half of the month is cool and unsettled...but there is plenty of time for things to change, I know.

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Amplification of the east European ridge results in the Scandinavian trough becoming negatively tilted which opens the back door for the Atlantic to mosey in. Quite a bit of cold air around

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Edited by knocker
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Top class post Mike, we really are privelaged here on netweather to have so many insightful and astute posters... And I fully agree with your post, but you put it better than I would have.. ? Onwards and upwards after a short blip.. ?

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By the very end of the 12Z FV3, the vortex remnants seem to be on their last legs; a situation that I for one can't wait to happen...

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The average temp ensemble is, as is often the case in May, all over the shop:

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As for precipitation (in East Anglia)...there actually be some: image.thumb.png.ba19c3a5a0ccb068f2d3b05cbb100969.png:oldgood:

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The Ecm 12z eventually shows tropical maritime air sweeping in from the southwest so the rain should be a bit warmer.?

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Edited by Frosty.
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The ecm has the trough to the north east remaining influential throughMon/Tues with a front struggling south on Monday and showers on both days and both quite cold with temps way below average. The trough to the south west does make inroads Weds but very cold still in Scotland.

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ECM sniffing around a plume at 240hrs too.

Pressure falling around Greenland and the trough pulling back west into the Atlantic.

Letd hope this trend is built upon in the coming days. 

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I see similarities between the Ecm 12z operational / ensemble mean at day 10 so although T+240 is a very dodgy timeframe, if it's right it could herald a much warmer spell further ahead as the trough to the west digs well south we would initially bring tropical maritime air from the azores and beyond and then potentially scoop up air from southern europe / north africa..all a far cry from the arctic air set to flood down across the uk.

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ECM1-240.GIF

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The EPS mean 5-10 anomaly this evening has a highly amplified Europe with the positive/negative tilt ridge/trough combination with a complex arrangement upstream involving a high cell and positive anomalies in the Labrador straits and an elongated trough in the north west Atlantic The upshot of all this is a strong westerly upper flow exiting the north east seaboard and running south of the trough across the Atlantic before impacting the UK. It does diverge just to the east to the courtesy of the aforementioned amplification..Ergo unsettled with temps below average.

In the later period a watered down version of the this with the upper flow abating over the UK as it diverges a tad earlier so more settled and maybe the temps creeping above average.

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By Tuesday the pattern is well into transition with the Atlantic popping through the open door and a trough arriving from the west with strong winds and some much needed heavy rain

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For the rest of the week low pressure in charge so periods of showers and longer periods of rain, interspersed with sunny intervals. Temps still averaging a tad below average. This is of course courtesy of the gfs

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To me the most interesting thing about the Gfs 00z operational is the ending with +15 850's lurking just to the south..gets me in the mood for summer!!??

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The ecm has a low 976mb WSW of Ireland midday Tuesday with the fronts into Ireland and this fills slowly and tracks east so rain and strengthening winds overnight and through Wednesday for the UK. Temps still below average and significantly so in Scotland

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