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Winter 2010-2011 outlook

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Comments

  • Closed Accounts Posts: 2,693 ✭✭✭Redsunset


    Ramping in AUGUST:D:D

    It's gonna be mental round here come December.;)

    Loved the cobh vid as i was staying there couple weeks ago while working in Fota Island.


  • Registered Users Posts: 836 ✭✭✭derekon


    redsunset wrote: »
    Ramping in AUGUST:D:D

    It's gonna be mental round here come December.;)

    Loved the cobh vid as i was staying there couple weeks ago while working in Fota Island.


    We should ramp away !

    Lets be honest - this forum truly comes alive in winter with the prospects of snow.

    I am predicting a freezing winter this year for most of Ireland with more snow than last year...bring it on!

    Derek


  • Moderators, Science, Health & Environment Moderators Posts: 17,007 Mod ✭✭✭✭Gonzo


    for once I think that this Winter is gonna be really cold as well, normally I am thinking mild wet muck.


  • Registered Users Posts: 347 ✭✭isle of man


    its going to be a mild wet winter,
    no snow no big frezze at all


  • Closed Accounts Posts: 5,550 ✭✭✭Min


    Joe Bastardi says he is busy at the moment but will do his winter outlook before the end of the month.


  • Registered Users, Registered Users 2 Posts: 17,225 ✭✭✭✭nacho libre


    the stats' are against us having a predominantly cold winter.:( still, even in a mild winter we nearly always get at least one cold snap during february


  • Registered Users Posts: 101 ✭✭fishmahboi


    the stats' are against us having a predominantly cold winter.:( still, even in a mild winter we nearly always get at least one cold snap during february

    Weathergossip says that the winter will be mild but with some cold snaps


  • Registered Users Posts: 1,523 ✭✭✭jambofc


    a lot of signs now that we are heading for our usual wet n dreary irish winter,on a positive note ive had more snow in this area in a normal irish winter than i did last year.


  • Registered Users, Registered Users 2 Posts: 9,577 ✭✭✭lord lucan


    fishmahboi wrote: »
    Weathergossip says that the winter will be mild but with some cold snaps

    Sounds good to me.:)


  • Registered Users Posts: 836 ✭✭✭derekon


    jambofc wrote: »
    a lot of signs now that we are heading for our usual wet n dreary irish winter,on a positive note ive had more snow in this area in a normal irish winter than i did last year.

    Hey Jambo, its only the 4th September and already I am hearing that defeatist "why does it not snow in my area" tone (I remember your posts from last year when Dublin was plastered with snow yet you missed out) :)

    Don't be defeatist yet - lets all chat mid December and get a real grip on what is to come for Ireland's winter of 2010 - 2011

    I still think we are in for a cold one

    Derek


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  • Closed Accounts Posts: 592 ✭✭✭hotwhiskey


    As i live in the stick's, last year people were remarking on the amount of berry's on the tree's and in some cases hedges in fields were completely red. I,m know spring chicken and have seen some bad winter's in my life time, my grandfather would always go on what the Autumn would through up for the birds in terms of food and last year was a classic example more feeding makes for a harsher winter.

    I know it's a bit early but it's nothing in comparison to this time last year the next three to four weeks will show it true colour's or not.

    At the moment I'm going on a normal winter "wet and windy" with brief cold snaps.


  • Closed Accounts Posts: 5,150 ✭✭✭Deep Easterly


    I think this type of set up will be the dominant winter 2010/11 theme:

    12_0_mslp850.png

    high pressure to our near south killing off any storm potential and any chance of polar or continental incursions; on the plus side, it should be on the mild, if cloudy side for much of the season with just the risk of the odd patch of drizzle in the west :rolleyes::rolleyes:


  • Closed Accounts Posts: 6,466 ✭✭✭Lumi


    I think this type of set up will be the dominant winter 2010/11 theme:

    12_0_mslp850.png

    high pressure to our near south killing off any storm potential and any chance of polar or continental incursions; on the plus side, it should be on the mild, if cloudy side for much of the season with just the risk of the odd patch of drizzle in the west :rolleyes::rolleyes:
    I know that the weather in the West of late has taught us to 'expect nothing lest ye be disappointed' but this is taking pessimism to a whole new level:eek:;)


  • Closed Accounts Posts: 5,150 ✭✭✭Deep Easterly


    Fionagus wrote: »
    I know that the weather in the West of late has taught us to 'expect nothing lest ye be disappointed' but this is taking pessimism to a whole new level:eek:;)

    I nominate this (strangely beautiful) tune to be our winter anthem:



    Works well as a aural accompanient to the visual abomination of that chart posted above. :cool:


  • Closed Accounts Posts: 6,466 ✭✭✭Lumi


    I nominate this (strangely beautiful) tune to be our winter anthem:



    Works well as a aural accompanient to the visual abomination of that chart posted above. :cool:

    The charts and aural accompaniment have cruelly excised any naive optimism regarding the forthcoming winter (leafs through photos of winters past and weeps silently) Thanks Patrick !! :(


  • Registered Users Posts: 595 ✭✭✭Chicken Run


    to add my 2p worth - judging by the amount of berries and sloes in the hedges (shedloads) I reckon it's gonna be another deep freeze similar to last year's.

    Must lag the water pipes more !!!!!!


  • Closed Accounts Posts: 5,150 ✭✭✭Deep Easterly


    Fionagus wrote: »
    The charts and aural accompaniment have cruelly excised any naive optimism regarding the forthcoming winter (leafs through photos of winters past and weeps silently) Thanks Patrick !! :(

    Your welcome! :p:D


  • Closed Accounts Posts: 6,466 ✭✭✭Lumi


    to add my 2p worth - judging by the amount of berries and sloes in the hedges (shedloads) I reckon it's gonna be another deep freeze similar to last !!
    My Nan used to say 'many haws, many sloes, many cold toes!'


  • Registered Users Posts: 595 ✭✭✭Chicken Run


    Fionagus wrote: »
    My Nan used to say 'many haws, many sloes, many cold toes!'

    :D
    "Many sloes, plenty of sloe-gin"

    (purely medicinal of course *cough*)


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  • Registered Users, Registered Users 2 Posts: 1,789 ✭✭✭BEASTERLY


    to add my 2p worth - judging by the amount of berries and sloes in the hedges (shedloads) I reckon it's gonna be another deep freeze similar to last year's.

    Must lag the water pipes more !!!!!!

    Hoe does the weather that is yet to happen have any sort of effect on the growth of plants and their fruit?


  • Registered Users Posts: 347 ✭✭isle of man


    BEASTERLY wrote: »
    Hoe does the weather that is yet to happen have any sort of effect on the growth of plants and their fruit?

    nature has a wondefull way of surprising us and doing things you would not expect and you could not belive to be true.

    There is a lot things you can look at in the world that you would think would mean northing but nature allways has its plan


  • Closed Accounts Posts: 3,258 ✭✭✭MUSEIST


    nature has a wondefull way of surprising us and doing things you would not expect and you could not belive to be true.

    There is a lot things you can look at in the world that you would think would mean northing but nature allways has its plan

    Yeah,
    I am pretty sure tipp winning the all ireland means the winter will be a white out, its a sign, i am certain. Oh and I swore I saw winter 10/11 very cold written in the butter in my toast this morning, tis looking good.


  • Registered Users, Registered Users 2 Posts: 1,789 ✭✭✭BEASTERLY


    nature has a wondefull way of surprising us and doing things you would not expect and you could not belive to be true.

    There is a lot things you can look at in the world that you would think would mean northing but nature allways has its plan

    Ok can you give me some evidence, if you have no theory for why there may be a connection, or any statistical evidence even, then please do not be declaring this ''theory'' fact.

    The only reason may be that the plants are phycics. Look at it from my point of view. I know for a fact that it will be pissing rain on 23rd July 2013 beacause I saw to pigeons going directly overhead within 3 hours of eachother today.

    See that is every bit as credible as your theory, not saying much in fairness.


  • Registered Users Posts: 347 ✭✭isle of man


    BEASTERLY wrote: »
    Ok can you give me some evidence, if you have no theory for why there may be a connection, or any statistical evidence even, then please do not be declaring this ''theory'' fact.

    The only reason may be that the plants are phycics. Look at it from my point of view. I know for a fact that it will be pissing rain on 23rd July 2013 beacause I saw to pigeons going directly overhead within 3 hours of eachother today.

    See that is every bit as credible as your theory, not saying much in fairness.

    Well i know a man that can tell what the weathers going to do by just looking at 4 hills,

    Also i know when its going to rain in the next 24 hours if i hear just 1 sound from where i live.

    Can i really prove all this by hard scientific facts. prob not.
    But does not make them any less true. well thats up to you


  • Registered Users Posts: 195 ✭✭gothwalk


    BEASTERLY wrote: »
    Hoe does the weather that is yet to happen have any sort of effect on the growth of plants and their fruit?

    Well. The theory seems to be that there are perceptible signals - presumably in weather patterns early in the year - which indicate the conditions in the coming winter. Plants can't reason, but they're subject to evolution, so they can evolve toward taking advantage of it.

    In a cold winter, animals and birds need more food. A tree that has produced more fruit will feed more animals, and have its seeds spread further. Therefore, natural selection will favour the plants which respond to the early signals by producing more fruit.

    Reading backwards from this, we can guess that heavy crops indicate a cold winter.

    I'm not convinced of the veracity of this, mind. Not because the theoretical process is dodgy, but because I don't believe that there are reliable signals more than a few weeks in advance. Weather is chaotic - in the mathematical sense - and so while we can produce guesses based on previous patterns ("attractors"), we can't predict outliers with any accuracy at all.


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  • Registered Users Posts: 501 ✭✭✭Aiel


    I love a good old fashioned Atlantic Storm.I go down to Prom at Salthill and watch the show,very cool.
    Last winter i was in NYC with the girlfriend,was -16 Celcius one night,never experienced cold like that.Then going back to Ireland on January 7th we couldnt land in Dublin as runway was frozen so we were diverted to London.We couldnt land there though as only Heathrow was opened and too many flights trying to land there.So we were diverted to Manchester but no luck there.Finally we landed in the snow of Glasgow(after flying for 90 extra minutes on a Transatlantic flight,so fuel was very low).It was amazing flying over Ireland and England though and seeing just all white landscape.Eventually Shannon opened up and we took off for there but on route Dublin airport re-opened so landed there about 5 hours late:).Then no buses were going and roads were icy so we took the train down to Galway.Again it was amazing to see the picture postcard white landscape.:)A great adventure,no travel plans for this winter though.:)


  • Registered Users, Registered Users 2 Posts: 5,068 ✭✭✭Iancar29


    I hope to be goin back to Norway aain wit friends if we get a trip for aroun the same price we went for back in January... Was amazing., we landed in Torp (Olso) airport. It was snowing alot. As soon as we pulled into the terminal and gettin ready to get off the plane the pilot announced ..." welcome to Oslo Torp hope u enjoy ur stay, be carefull gettin off fokes , it's -9 out there" . :) , I don't even know how the airport was open , comparing to when our airport closes it would hav been at least twice as bad.

    But ye, we stayed in a cabin in a very small village outside a place called RISör. All snowed in . Open fire , heated pool and jacuzzi , sauna that we couldn't get to work properely :( .

    But ye, I'm dying to go bac! 5 feet snow drifts .... I miss them!


  • Registered Users, Registered Users 2 Posts: 17,225 ✭✭✭✭nacho libre


    Iancar29 wrote: »
    I hope to be goin back to Norway aain wit friends if we get a trip for aroun the same price we went for back in January... Was amazing., we landed in Torp (Olso) airport. It was snowing alot. As soon as we pulled into the terminal and gettin ready to get off the plane the pilot announced ..." welcome to Oslo Torp hope u enjoy ur stay, be carefull gettin off fokes , it's -9 out there" . :) , I don't even know how the airport was open , comparing to when our airport closes it would hav been at least twice as bad.

    But ye, we stayed in a cabin in a very small village outside a place called RISör. All snowed in . Open fire , heated pool and jacuzzi , sauna that we couldn't get to work properely :( .

    But ye, I'm dying to go bac! 5 feet snow drifts .... I miss them!

    Aye. I remember those photos.
    If it's a predominantly mild Winter here this year, your future photos could be painful viewing and leave people feeling envious:)


  • Registered Users, Registered Users 2 Posts: 3,516 ✭✭✭irish1967


    (nips in from 8 months of lurking silence) Yeah I remember those pics too :o)


  • Registered Users, Registered Users 2 Posts: 2,655 ✭✭✭delw


    Iancar29 wrote: »
    I hope to be goin back to Norway aain wit friends if we get a trip for aroun the same price we went for back in January... Was amazing., we landed in Torp (Olso) airport. It was snowing alot. As soon as we pulled into the terminal and gettin ready to get off the plane the pilot announced ..." welcome to Oslo Torp hope u enjoy ur stay, be carefull gettin off fokes , it's -9 out there" . :) , I don't even know how the airport was open , comparing to when our airport closes it would hav been at least twice as bad.

    But ye, we stayed in a cabin in a very small village outside a place called RISör. All snowed in . Open fire , heated pool and jacuzzi , sauna that we couldn't get to work properely :( .

    But ye, I'm dying to go bac! 5 feet snow drifts .... I miss them!
    yeah iancar remember them photos&remember being jealous as f**k but hpe tings work out for you again this year,unfortunately il will have to put you on igonre list as couldnt watch them photos as we get washed out :D(only joking have great time if you get there&post plenty of photos)


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  • Registered Users, Registered Users 2 Posts: 7,250 ✭✭✭pauldry


    No whiteout this year but some short sharp bursts of cold IMO

    Last year was a once in 40year event. Surely not another.


  • Registered Users Posts: 195 ✭✭gothwalk


    pauldry wrote: »
    No whiteout this year but some short sharp bursts of cold IMO

    Last year was a once in 40year event. Surely not another.

    The more I look at the records, the more I'm convinced that this argument doesn't stand.

    Sure, it's unusual to have two severe winters in a row, but it's unusual to have severe winters at all. Yet the early 1940s saw three in a row.

    Given that reliable records don't go back ALL that far - say early 1600s in the best cases - we've only about 400 winters to reckon things against. So in that set of data points, just considering the three cold winters in the 1940s, and, say, the winters of 1739-41, you can say that 1.5% of winters were cold ones happening in consecutive years.

    Then there's 1812-1817, and the winters of 1979-1982. We're looking at something around 5%. So it can certainly happen - indeed, given that I'm only skimming records I've found online, it's entirely possible that I'm underestimating that possibility.

    The other side of the argument is that the weather in one year really doesn't have much of a bearing on the weather in the next. I'm not willing to say it's in coin toss territory, where one flip has zero effect on the next, but it may not be far off. There's far too much in the way of interference between March and October for any small-scale pattern to hold through, so we're stuck with the larger-scale patterns of climate. And those are REALLY hard to predict.

    Conclusion: We can't really know until it happens, but we can't rule out the possibility of another very cold winter.


  • Closed Accounts Posts: 5,150 ✭✭✭Deep Easterly


    gothwalk wrote: »
    The other side of the argument is that the weather in one year really doesn't have much of a bearing on the weather in the next. I'm not willing to say it's in coin toss territory, where one flip has zero effect on the next, but it may not be far off. There's far too much in the way of interference between March and October for any small-scale pattern to hold through, so we're stuck with the larger-scale patterns of climate. And those are REALLY hard to predict.

    Top post, and one I largely agree with.

    I am currently trying to do a personal study (I really need to find a job..:o) on the the possible effects of La Nina/El Nino on an Irish winter and will post results here when some sort of conclusion is reached. I am basing this study mostly on temp and SLP data from Valentia & Malin Head since 1956.

    However, just looking at the winter temperature data in isolation from both Malin Head & Valentia, there is really nothing to suggest that cold winters will follow any particular precedent.

    127084.jpg

    Looking at the average winter season temp anomaly from Valentia and Malin Head since 1956 in the chart above, it can be seen that a cold winter rarely occurs after a cold winter in the previous year, with the exception of the late 70's. Statistically, a more average winter is more likely to follow a cold one!

    But that is just statisical nonsense. Chaotic forces when recorded will always establish a pattern over time, that is the nature of statistics, but it is a psuedo pattern which will prove nothing. The climate of Ireland is established from such. A nice straight statisical line that tries to decepher some sort of logic where none exists.

    This winter could well be cold, it could well be mild. But personally I still think it will be ****e...:D


  • Closed Accounts Posts: 6,466 ✭✭✭Lumi


    gothwalk wrote: »
    Conclusion: We can't really know until it happens, but we can't rule out the possibility of another very cold winter.
    This winter could well be cold, it could well be mild. But personally I still think it will be ****e...:D
    Personally, I don't particularly care whether the coming winter is very cold or not. What I would like to see is the return of the Atlantic storms, howling winds, occasional dumps of snow and in a word the variety that once was the stuff of winters on the west coast.
    Cold or not, I really can't face the prospect of another nonedescript, monochrome winter like the one just past.
    Good luck with the study - sounds interesting :)


  • Closed Accounts Posts: 5,150 ✭✭✭Deep Easterly


    Fionagus wrote: »
    Personally, I don't particularly care whether the coming winter is very cold or not. What I would like to see is the return of the Atlantic storms, howling winds, occasional dumps of snow and in a word the variety that once was the stuff of winters on the west coast.
    Cold or not, I really can't face the prospect of another nonedescript, monochrome winter like the one just past.
    Good luck with the study - sounds interesting :)

    Thanks F, probably sounds more interesting than it will be and will probably be flawed right from the start as I am just using 2 parameters (surface temp and mean sea level pressure). The reason I am using Malin Head and Valentia in my 'study' is that they are on opposite ends of the country, which will prove useful regarding sea level pressure deviations. It will be interesting to see how many times Malin Head recorded a higher seasonal mean than Valentia (suggesting a negative NAO) and how this would coincide with not only the then current ENSO condition, but also what ENSO set up this followed on from in the months before hand.

    For anyone who might be interested, this 1992 article, published in the International Journal of Climatology, gives a fair good insight on the same subject. It concludes that because Europe is at the furthest possible point away from the effects of Nino episodes it becomes almost futile to try and establish a link between them and NW European weather patterns; however, there is the suggestion that La Nina winters tend to have a more mobile, zonal flow running a little further north than normal.

    This I want to try and see for myself in my little escapist project. It won't be anything overly scientific as that is not my incline, but hopefully it might be of interest to some. :)


  • Closed Accounts Posts: 2,693 ✭✭✭Redsunset


    ts.gif


    "One has to go back to 1955 to find stronger La Niña conditions for this time of year in the MEI record, and back to September-October 1975 for lower MEI values at any time of year."



    lanina.gif







    comp.png






    In the context of recent plunge of the MEI into strong La Niña conditions, this section features a comparison figure with strong La Niña events that all reached at least minus one standard deviations by June-July, and a peak of at least -1.4 sigma over the course of an event. The most recent bigger La Niña events of 1998-2001 and 2007-09 did not qualify, since they either did not reach the required peak anomaly (the first one) or became strong too late in the calendar year (both).

    The most recent (July-August) MEI value shows a continued drop from earlier this year, reaching -1.81, or 0.64 sigma below last month's value, and 2.35 standard deviations below April-May, both record-fast drops for this time of year. In fact, the three-month drop set a new all-time record for any time of year, beating a 2.33 sigma drop in 1998. The most recent MEI rank (2nd lowest) is clearly below the 10%-tile threshold for strong La Niña MEI rankings for this season. One has to go back to 1955 to find stronger La Niña conditions for this time of year in the MEI record, and back to September-October 1975 for lower MEI values at any time of year.

    Negative SST anomalies have overspread much of the eastern (sub-)tropical Pacific in the latest weekly SST map.
    sst_anom.gif



    Many of these anomalies are now in excess of -2C. For an alternate interpretation of the current situation, read the latest NOAA ENSO Advisory which represents the official and most recent Climate Prediction Center opinion on this subject. In its latest update (5 August 2010),
    La Niña conditions are expected to strengthen and last through the upcoming Northern Hemisphere winter.


    nino34SSTMonE120.gif




    So there's a bit of info for you Deep,if you have not already come across it.

    Interesing now to see how this plays out with global winter temps.


  • Closed Accounts Posts: 2,667 ✭✭✭WolfeIRE


    decatlantictemp.png
    Decemeber will be milder than normal but this is of course does not rule out colder outbreaks at any point.


  • Closed Accounts Posts: 5,150 ✭✭✭Deep Easterly


    redsunset wrote: »
    Interesing now to see how this plays out with global winter temps.

    Sure will! Thanks for all that Redsunset.

    Off the top of your head, do you think there is a connection between cold/warm nino episodes and increased probabilities of a negative winter season NAO?

    Just looking at your first graph:

    ts.gif


    it almost seems a recurrent fact that colder winters in Ireland will more likely happen after an extented la nina spell which is entering a neutral or warmer anomaly. I am just looking at this at fact value though and looking particularly at 78/79, 85/86 and 2009/2010. Other cold winters, such as 62/63, seem to not follow this pattern though.


    ECMWF Nino Plume August forecast seems a lot more conservative than the NWS/NCEP forecast regarding the continuation of depth of 3.4 region anomaly for this coming winter:


    nino_plumes_public_s3%213.4%21201008%21chart.gif


    but interesting to see that both forecasts show no subtantial rise into the first quart of 2011.


  • Closed Accounts Posts: 2,693 ✭✭✭Redsunset


    Well Deep as shown in the sun thread there is a correlation between Solar Sun spot cycles and El Niño events and every year following a minimum number of solar sun spots is an el niño year. The el niño events also happen at other times in between these 11 year cycles, but every solar minimum is associated with an el niño event.
    Since the el niño event happens on the average about every 6 years the sun spots predict about half of them.

    Also its more complicated than that because when in an easterly QBO state and low solar activity,it tends to support a negative Arctic oscillation.

    The low solar activity could correlate with La Nina and a negative North atlantic oscillation.

    Its all very much still up in the air though.

    Read this http://www.john-daly.com/theodor/solarnao.htm


  • Closed Accounts Posts: 1,530 ✭✭✭TheInquisitor


    gfs0372.png

    Time to RAMMMPPPPPPPPP!!!!!!!!!!!!!!!!


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  • Closed Accounts Posts: 1,530 ✭✭✭TheInquisitor


    ecm0216r.gif

    Possible cold spell in 5-9 days time. The ramping continues...*

    *[Poster does know there is no chance of snow till at least end of December] :eek:


  • Closed Accounts Posts: 2,667 ✭✭✭WolfeIRE


    http://www.predictweather.com/ArticleShow.aspx?ID=307&type=home

    this is the crowd who predicted last year's cold winter.
    costs 4 euro though. i dont love snow that much :p


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora




  • Registered Users Posts: 195 ✭✭gothwalk


    What do you make of this?

    Crivens, I say.

    I'd be a lot more convinced if it was presented in text with links, charts, etc.

    However kooky the presentation, though, the reasoning is clear. I'm particularly interested by the graphics that looked like a heat map of the North Atlantic - I'm reasonably sure that those currents are what keep us from having a climate like that of Labrador.

    I'm still taking it - as with any prediction further out than the day after tomorrow - with a pinch of salt, but I'd be interested to see more data.


  • Registered Users, Registered Users 2 Posts: 17,225 ✭✭✭✭nacho libre


    It is interesting given Joe Bastardi has stated in two years time we are likely to experience a couple of severe winters in a row.
    Given the effect of such activity tends to take time to materialise, if their hypothesis is actually correct, it's more likely to be next year or the year we see the consequences. So perhaps the guy depicted as a kook for suggesting something was amiss with the North Atlantic adrift was on to something afterall. In saying that though Bastardi has never mentioned any concerns he has about the gulf stream. Surely if he noticed something he'd be alerting people to it.


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    For what its worth this is the website from the guy who made that video above.

    http://globalcoolingnewiceageuk.blogspot.com/

    Haven't read it yet though.


  • Posts: 31,118 ✭✭✭✭ [Deleted User]


    I think (hope) it's an exaggeration, just having the gulf stream's influance is worth at least 2-3C average winter temperature, without that winters will be cooler but not freezing. Increased cloud cover caused by reduced solar radiation may mean cooler days but less colder nights.

    Combine those together with a La Nina and a high stuck over the Atlantic, then we're in for a real winter chill! Assuming normal westerly winds then it'll just be a couple of degrees cooler. Must stock up the fuel.


  • Registered Users, Registered Users 2 Posts: 1,789 ✭✭✭BEASTERLY



    Isn't this what I got totally shot down for posting a couple of weeks ago?

    Well the thing about the NAD anyway.


  • Registered Users Posts: 195 ✭✭gothwalk


    I think (hope) it's an exaggeration, just having the gulf stream's influance is worth at least 2-3C average winter temperature, without that winters will be cooler but not freezing. Increased cloud cover caused by reduced solar radiation may mean cooler days but less colder nights.

    I'm not convinced of this. Looking across the same latitude elsewhere on the planet, I'm seeing a lot of places that have much colder winters, even on the coasts.

    However, even if the Gulf Stream being off only made for a change of 3 degrees, that will make a considerable difference to our usual January average of 4C. It would, for example, mean that many days would not get above freezing, rather than that being a very unusual event as it is now.

    Also, increased cloud cover as discussed in that video is global, not local - since, as often repeated, climate is not weather, that doesn't mean that we'll get more cloud here (to be fair, I'm not sure how we could). It's possible that with no Gulf Stream, we'd have less cloud, although I don't venture to make that a solid prediction.

    The issue with that presentation is not the reasoning of "if these things happen, we'll have colder winters", it's "can these things happen?". I've yet to see convincing evidence that the Gulf Stream can shut down, and yet to see convincing links between the La Nina or sunspot levels, and, well, anything here. Atmospheric shrinkage is not a thing I've even heard of before, and I've no idea what it would do. Increase average pressure worldwide? Expose us to more radiation? Expose us to less radiation? No idea.


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  • Closed Accounts Posts: 6,466 ✭✭✭Lumi


    gothwalk wrote: »
    Atmospheric shrinkage is not a thing I've even heard of before, and I've no idea what it would do. Increase average pressure worldwide? Expose us to more radiation? Expose us to less radiation? No idea.

    There's a short discussion on the upper atmospheric shrinkage phenomenon Here
    I've only skimmed through the article quickly but it's seems as if it's not thought to have a direct effect on the weather.


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