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SqueakheartLW

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Posts posted by SqueakheartLW

  1. On 16/12/2023 at 11:42, Summer8906 said:

    I'd tend to agree. I'd add first half of January to that too, which seems to be mild, wet and windy around 50% of the time and mildish most years.

    Significant cold weather in the first half of Jan happened only in 2021, 2013, 2010, 2009, 1997, 1987 and 1985 over the same time period. Additionally, 2019, 2017, 2003, 2001, 1992 and 1991 had some (non continuous) periods of cold and frosty weather but the rest were mostly varying degrees of mild with only brief transient cold spells.

    I think I need to correct you here.

    January 2013 was a tale of two halves but a colder second half, not the first. Generally mild up to around the 13th, then the cold weather kicked in and was generally on and off from mid January 2013 until early April 2013

    January 2021 wasn't overly cold, nothing that I would call significant and the month overall was only a very small margin below average CET wise.

    I would agree with 2010, 2009, 1997, 1987 and 1985 though for first half of January cold

  2. 20 hours ago, WYorksWeather said:

    Just having a look now at minima and maxima on the CET.

    Minima

    Minima is easy enough, the current anomaly is 1.36C, the highest ever is 1.37C, we only need minima to average around 4C to the end of the year to break it, which should be trivial. In actual values, to one decimal place, the finish for 2023 will likely be a third year at 7.2C, but beating 2006 and 2014 in two decimals. We would need to finish at 1.40C to round to 7.3C, so that almost certainly won't happen.

    The fourth highest, incidentally, is 2022, so still quite a strong year on minima.

    Maxima

    For maxima, 2022 absolutely destroyed the previous record with an anomaly of 2.22C, resulting in a final value of 15.3C. For reference, the previous highest was 14.8C in 2003 (tied in one decimal with 2014).

    The current maxima anomaly is 1.85C. The relevant normal for December is 7.2C, so assuming we average 10C to the end of the year, that should be good for another couple of hundredths on the annual. The final value will round to either 14.9C or 15.0C in one decimal, so a clear second place.

    Summary

    So assessing the year overall, despite the large amounts of cloud and rain, it really doesn't have a huge bias towards minima over maxima. Still well above average in maxima, but probably at the wrong times of the year, with below average maxima even on 1961-1990 in July, albeit only just by 0.2C. One of the most notable features this year has been mild/warm rain, which has also held up the maxima. I remember lots of comment on this at the time, a lot of the wet/windy dross in the summer was associated with temperatures around 17-20C rather than the more typical 14-17C, or even lower, that was seen in similar patterns in years gone by. For even such an awful July to average maxima of 20.2C is quite surprising when you consider the prevailing weather patterns.

     

    There has been a lot more Atlantic weather in 2023 and what has been notable for this year is how warm the Atlantic is so when we got the westerly dominated July and August it seemed cool but in fact wasn't really that cool at all. I think it is the SSTA's that have contributed a lot to 2023 somehow ending up a record breaker in it's own right even with no real stand out freak daily minimums or maximums, just persistently above average really all year.

    Despite nothing that notable except June and September for monthly CET's it looks dead certain now we will see another 11C CET year straight after our first one last year and it looks like we won't be that far off last year's annual mean CET value either, within a few hundredths Celsius.

    Predicted annual mean = 11.090C (subject to very small changes depending on model output)

    2022 annual mean = 11.149C (2023 predicted to be only -0.059C below this at present)

    • Like 1
  3. On 19/12/2023 at 19:35, Don said:

    Pretty much a basin wide event now?

    Maybe the reason winter has gone off the rails with the mild and wet is that the NINO is too strong. We really needed something around +1C to +1.5C, not around +2C which is almost mimicking a Super Nino pattern for December now and with NINO 3 warmer than NINO 4 the EP event isn't helping either.

    • Insightful 1
  4. A few potential split runs showing on both GFS 12z and GEM 12z

    GFS

    image.thumb.png.ce807642bb56139db4733b3c246f8f31.pngimage.thumb.png.8f7260630e34e51c9858f5a9cbfdf4e6.pngimage.thumb.png.9a9a97a5fa38c46302525e4973962049.png

    image.thumb.png.fda8b3b348d2673698e8c9dbc868a62a.pngimage.thumb.png.eef2824cabfda9796164fc03d08f5b19.pngimage.thumb.png.a058ae44e165013934d8be0d78a2b4c3.png

    image.thumb.png.e226b8c49d8f2bd1b865104d7599203c.pngimage.thumb.png.a0703dc68f93eb9faf39b0368df71a40.pngimage.thumb.png.c744d03ee9fc7733ce257d486e024e93.png

    9 of 32 members here with potential split vortex, hope this increases as we get nearer with 23 of the 32 looking like a displacement event on this run.

    GEM

    image.thumb.png.e93f7f96e53885a72b5132113ca64a8f.pngimage.thumb.png.92c631b40b6f81084f7daa1a546ec860.pngimage.thumb.png.8dfc36f9e3a110de2eab416d8f896c83.png

    image.thumb.png.3f3c566c5ba0f0103b917dcca05603b6.pngimage.thumb.png.8c776ef6c3adc9e21bc387df8812ff05.pngimage.thumb.png.30f2a62d633c5097806c3e712b38117c.png

    image.thumb.png.425368ad98244459cde2b1e8470c6582.pngimage.thumb.png.18ebc71cf402b4df5aeca8a258691bf8.pngimage.thumb.png.4d4ed73dab496de778917ca6ef8a8c45.png

    Again 9 members with the GEM only this time a higher proportion with only 21 to go on so GEM more keen for the vortex split on the 12z's 

  5. An update on the SSW for me today and like yesterday it is based on the GFS 12z and GEM 12z

    GFS 12z

    GFS 12z is really churning out the toasty warm charts today

    image.thumb.png.32f131efa327a9932687d6173c1c386e.pngimage.thumb.png.d51ccf862769bd60e7528baaf2ee8e5a.pngimage.thumb.png.eda4976033b0d465d5d216d4546962e7.png

    image.thumb.png.2232b35c654abc37fb0706b17cba0907.pngimage.thumb.png.bbd022774218d1875a568f495f3f4ed0.pngimage.thumb.png.8989665c19eb3aca9260a777b0631f6c.png

    image.thumb.png.a379176186179cecf5f453477d93c33d.pngimage.thumb.png.2f93c655fb717dc0735cf04f5f173195.pngimage.thumb.png.3877647b48a67dcc584b1c76b6bdb8ea.png

    That's 9 of 32 members of the 12z going for a +4C peak warming but my favourite one is P29 below

    image.thumb.png.e88270492129d50858866006d80a719c.png

    A nice toasty +12C warming on this member

    GEM 12z

    GEM has this nice +384h chart showing on P07

    image.thumb.png.e6da3148cb352638f72fd3c460e3a8c4.png

    This is the only chart on the 12z's between GFS and GEM that came anywhere close to a split vortex chance

    Not as many toasty +4C or above warmings on today's GEM 12z compared with yesterday with only two +4C's

    image.thumb.png.031c68e0a2bb640a88b4706df5bcdd4f.pngimage.thumb.png.8ccfa630166ba85aefca91202c5511e2.png

    It does make up for it by having a +8C warming chart on P14

    image.thumb.png.773b637de662e233babcf2501a66d5e1.png

    Analysing all members of both GFS 12z and GEM 12z (20/12/2023)

    GFS
    +12     29
    +4       02,07,08,11,18
               21,26,28,30
    0         Op,Ct,03,06,09
               10,14,20,24,25          Average GFS Warming Peak = -0.250C (-2.625 yesterday)
    -4        01,04,12,13,15         (Upgrade of 2.375C compared with 19/12/2023)
               17,19,22,23,27
    -8        05,16

    GEM
    +8      14
    +4      04,17
    0        01,05,07,08
              13,15,20                     Average GEM Warming Peak = -2.095C (-2.286 yesterday)
    -4       Ct,02,03,09,10          (Upgrade of 0.191C compared with 19/12/2023)
              12,16,18,19
    -8       06
    -16     11

    Good news for those wanting a more toasty warming it would seem as both GFS and GEM have upgraded the peak warming temperature, especially the GFS. Seems even more nailed on today and what was telling is how every single member of both GFS and GEM that goes far enough out had a warming of some degree on it.

    • Like 4
  6. GFS 12z

    GFS 12z P07 looks great at the end

    image.thumb.png.0e32c0f5c86f26eac9e1005fe9952b87.png

    Nice signs that a split could occur here

    image.thumb.png.a048ed8a85d9e00462d268bf0df15b52.pngimage.thumb.png.1854093ad406c9b55b618ff911d55c68.png

    Also the warmest warmings from the GFS 12z too.

    GEM 12z

    A nice attempt to split the vortex here on P09

    image.thumb.png.a5afb768f01e3a4b1d594b18fa37e227.png

    GEM looks even more keen for a toasty warming

    image.thumb.png.2b13d33edf932ca8b0b321a88ba73362.pngimage.thumb.png.dab078601f280c5060ed0c832d56a512.pngimage.thumb.png.bd72332e183842b93c74d0229d3db865.png

    image.thumb.png.2f45b96239d17427b4a7089f468cd22e.pngimage.thumb.png.61e17aac4b903f61efeddb4f95737a65.pngimage.thumb.png.a709f0baec4a23e69026bb6aee98d6c8.png

    6 of 21 members going for +4C

    Analysing all members of both GFS and GEM

    GFS
    +4       11,22
    0          Ct,01,06,08,10,13,16
                18,21,23,28,29,30
    -4         02,03,04,05,07,09,12                                    Average GFS Warming Peak = -2.625C
                15,17,20,24,25,27
    -8         19,26
    -12       Op,14

    GEM
    +4        Ct,01,06,14,15,20
    0          04,11,18
    -4         02,09,13,16,17,19                                        Average GEM Warming Peak = -2.286
    -8         03,05,07,08,10,12

    At present it seems both GFS and GEM are very keep for a significant warming with the GEM marginally warmer with the peak than the GFS but there's very little in it.

    • Like 3
  7. 5 minutes ago, damianslaw said:

    There was a quick response by the 14th cold air invaded, but I'm not sure the cold Jan spell was associated with the SSW. The March cold certainly was. 

    Looks like it when you compare the 10th Jan 2013 10mb strat chart with the 23rd March 2013 500mb trop chart

    archivesnh-2013-1-10-18-4.thumb.png.255605391c578426981fe2cf93389a51.pngarchivesnh-2013-3-23-12-0.thumb.png.fc7d24b83cd200cf0a0b06af85c2d9da.png

    I have roughly marked out where the trop ridging is and where the troughing is. Looks very similar to the strat chart from over 2 months before it, compare this with 14th Jan 2013 below and there's no resemblance to the strat pattern at all

    image.thumb.png.fd423a14fa6f230da2efb6a8f14ac89c.png

    Generally still have the polar vortex in polar regions but split a little bit but nothing like the strat pattern.

    • Like 1
  8. 17 minutes ago, damianslaw said:

    Did the Jan 13 SSW bring a split or displaced outcome. Someone mentioned similiarities with 12/13. I think it happened on New Year's Day. December is behaving similiar to 2012.. 

    Definitely a split with Jan 13.

    Main warming starts on Siberian side and peaks on 2nd Jan 13 at +12C

    image.thumb.png.3239f2a1a50c712ed5c24f980df81d23.png

    This warming pushes into the pole and starts stretching the vortex by 8th Jan 13. Signs of another warming showing up here on the US side as well. Must be a wave 2 event taking place.

    image.thumb.png.a0e3e060372b3ebceafd46b3157cd3a0.png

    This second warming intensifies and combines with the first main warming and starts splitting the vortex by the 9th Jan 13

    image.thumb.png.2aa8e9427730862848276bcb5c840eb6.png

    Major warming complete by 10th Jan 13 with vortex split and a band of warm strat temps crossed between the US and Siberia

    image.thumb.png.fd6f0596bf739629566dc0211ef4804c.png

  9. It would be a remarkable feat to see all 12 months above the 1961-90 average but what I think 2023 doesn't deserve is for us to see yet another 11C CET mean year. I have been creating the rolling CET for 2023 for some time now and it is looking like a very close run thing as to whether we not only get all 12 months above 1961-90 but we also get another 11C year.

    Untitled.thumb.png.b56372b05a8b94aa94a05f8cc822f541.png

    Now looking at the table above you can see how we are doing against the previous top 10 years. Currently we are tracking a little behind 2022 but we are very close to 2014. So what now looks very certain is that we are going to see a top 3 finish for 2023. We are provisionally at 11.190C up to 16th December and if the 17th December GFS 00z mean predictions come true then 2023 will finish in 2nd position on the mean CET record. We will also set a December 2023 mean CET of 5.855C.

    We will have achieved based on this prediction

    • Another 11C CET year out of what seemed no where considering much of the year has been unremarkable except for June 2023 and the September heatwave. 2022 deserved it's 11C CET mean but to me 2023 doesn't and it would be such a shame for an unremarkable year overall to take another 11C CET mean.
    • All 12 months above 1961-90. A December 2023 CET of 5.855C would easily see this record fall. We should have done this last year as 2022 deserved it but 2023 is going to steal this remarkable feat from an unremarkable year for big extremes in the UK at least.
    • A top 2 year immediately following the warmest year on the CET record last year. Again undeserved really considering how 2023 has been but it is only June 2023 and 10 days of September 2023 that have really put us in this position.
    • Thanks 1
    • Insightful 1
  10. When seeing lots of individuals over in the mod thread getting annoyed with the potential loss of blocking and cold to end the year need to think that we don't want to see a blocked pattern just prior to and during the potential SSW.

    If we have ZONAL BEFORE and DURING the SSW there is a much GREATER chance that the effects of the SSW will FLIP the pattern from ZONAL to BLOCKED.

    The reverse also holds true where a BLOCKED pattern BEFORE and DURING the SSW there is a much GREATER chance that the effects of the SSW will FLIP the pattern from BLOCKED to ZONAL.

    Example ZONAL to BLOCKED due to SSW

    Early 2013 was a perfect example. We went somewhat blocked in early December 2012 before we entered a more zonal period mid December to early January prior to and during the SSW which is exactly what we wanted as we then saw the result with the pattern flipping to generally blocked from mid January 2013 to early April 2013 and generally colder than average with some snow at times.

    Example BLOCKED to ZONAL due to SSW

    In contrast to this is winter 2001/02. We had a blocked and colder pattern just prior to and during the SSW. The result was that we lost the blocking signal early January 2002 and we FLIPPED back to default ZONAL for the rest of the winter. On this occasion the SSW RUINED the rest of the winter.

    • Like 3
    • Thanks 1
    • Insightful 2
  11. GFS looks to be odds on for this warming at the end of its ensembles at present but I can't say the same for the GEM although it has some interest in another way

    Here's the 4 best GFS 12z warmings

    +4C

    image.thumb.png.3b6393f8fba1284797f18f344abdb61f.pngimage.thumb.png.1c0da2c7071c45566d1bcff2ac5c69df.png

    +8C

    image.thumb.png.5400c254f494aeb001589bdb19ccdf27.pngimage.thumb.png.5c7b0dc6affd0f0a6e58589878ea8390.png

    These are at the warmest end but the main warmings appeared to peak more around -12C on the 12z

     The GEM has NO warmings showing at all but what is interesting on the GEM 12z is the number of ensemble members that are really stretching out the cold temperatures at the back end of the runs. I have included the 4 best ones below

    image.thumb.png.e82ef3b950128d4a0616740b79bb0ca1.pngimage.thumb.png.a8fba503795874f25d4b32393bc9a553.png

    image.thumb.png.eed15851bc73d0da75c706001f14211f.pngimage.thumb.png.881777597a1a9ce36268c07b7b6192c0.png

    There were several more members doing something similar but slightly colder than these ones. These look close to splitting the vortex despite no actual warming showing up.

    • Like 2
  12. GFS 12z P17 would be the perfect run into Christmas 2023. The 2m temps are based on my location in Scunthorpe. Adjust accordingly for your own location of course but the whole UK more or less follows the same changes.

    Tuesday 19th December         2m Temp Min (Scunthorpe) = 4.3C     2m Temp Max (Scunthorpe) = 7.3C

    image.thumb.png.e648a66c75c17ed26ab6cef0bd7648f4.pngimage.thumb.png.8740a4366654752d05efc501cc5fcf55.png

    A dry and most likely cloudy day when looking at the 2m temps for this day with an above average 2m min but slightly below average 2m max suggesting an inversion situation here but change is already brewing up to the north with those colder uppers and the trough waiting to push down towards Europe.

    Wednesday 20th December         2m Temp Min (Scunthorpe) = 4.8C     2m Temp Max (Scunthorpe) = 7.9C

    image.thumb.png.1368bb6e9bcd2e41b055539888a5607a.pngimage.thumb.png.feb165d2a607e76e005a28742fc6fab9.png

    The high pressure starts retrogressing out into the Atlantic, opening the doors to the Arctic. A cold front sweeps south during this day. Despite the lower uppers the day is in fact slightly milder than the 19th due to more mixing out of the air. The proper cold air doesn't arrive in Scunthorpe on this day which is why 2m mins and maxes are still mild.

    Thursday 21st December         2m Temp Min (Scunthorpe) = 1.6C     2m Temp Max (Scunthorpe) = 4.1C

    image.thumb.png.480900108a9e1e14c7a60d9a4f04958b.pngimage.thumb.png.c7e61aa803240a859ffc371e43c5fa72.png

    The UK is now into the cold Arctic airstream by the 21st with wintry showers a threat on exposed coastlines with the main snow risk in the north. The -5C 850hpa isotherm has swept through the country with the -10 850hpa isotherm waiting to the north. Most southern areas and inland areas getting a dry, sunny but cold day. Colder air is waiting to arrive however.

    Friday 22nd December         2m Temp Min (Scunthorpe) = -0.6C     2m Temp Max (Scunthorpe) = 1.3C

    image.thumb.png.a108a4555c75e36333acc5819ab3e498.pngimage.thumb.png.efaef3db4f8e4ba28e16e79ddb9a1c98.png

    An even colder day than the 21st with maxes struggling to get much above freezing (Scunthorpe +1.3C) with overnight air frosts. The snow threat has reduced in the east for now with the slight change to more of a NNW wind instead of a northerly. However some western areas are now at risk of snow showers coming in off the Irish Sea. A very cold winter solstice 2023 day too.

    Saturday 23rd December         2m Temp Min (Scunthorpe) = -2.4C     2m Temp Max (Scunthorpe) = 0.8C

    image.thumb.png.f0925993840d6e42c1ef74d0090722d2.pngimage.thumb.png.be2a2ec47060c786fa6115e4a586e253.png

    An even colder day sees the day before Christmas Eve almost an ice day in Scunthorpe but further north it may well be an ice day. A couple of troughs have formed in the flow here. One in the English Channel threatens a snow risk south of the M4 whilst another looks to be descending down across Eastern England giving a heightened snow risk for these areas (Including Scunthorpe)

    Christmas Eve         2m Temp Min (Scunthorpe) = -2.9C     2m Temp Max (Scunthorpe) = -0.6C

    image.thumb.png.4b3cb682ef790ea927d3d1bc51df0a0c.pngimage.thumb.png.f81ab24a8959c09e4b28429eecfa6668.png

    Christmas Eve sees an ice day for Scunthorpe at least but most likely across a large part of the UK as well after the dumping of snow in some places on the 23rd. Christmas Eve itself sees the snow threat reduce once more to just showers in exposed locations towards the coast

    Christmas Day         2m Temp Min (Scunthorpe) = -3.0C     2m Temp Max (Scunthorpe) = -0.7C

    image.thumb.png.64e563b87f054c3eca19d53213bca6dc.pngimage.thumb.png.341120400c0bf8124def468c75cd6515.png

    The big day itself looks very interesting with that trough that has moved up from France into southern UK. An ice day Christmas Day for Scunthorpe at least but the main interest here could be the widespread snow event associated with that trough and with the +0C 850hpa isotherm basically on the south coast then the snow could cover a large part of England. A nice white Christmas here on GFS 12z P17 if it came off. Even Scotland could get a white Christmas in more eastern parts with that flow from off the North Sea too.

    • Like 4
    • Insightful 2
  13. For those of us like me who have really missed the GFS extended run after it had played up for what seemed like an eternity can be pleased now it appears to be back up and running once again

    image.thumb.png.9daeb0bb83e9150b96fb3f2170660d98.png

    I always liked looking at the runs post +384h just for fun and to see what crazy or unrealistic scenarios it was churning out.

    Just for fun here's the coldest or potential cold or snowy Christmas Day charts

    Cold and possibly wintry

    P01

    image.thumb.png.c7a7ccc9236e51819ff4ca880cd9ba89.pngimage.thumb.png.c42a8f847a2610fce88d7bcbd140c44d.png

    P05

    image.thumb.png.f2b0714b47de9719725e99c4c4e4d580.pngimage.thumb.png.0916ba926a6f3ec455d3a2cb6c59955c.png

    P07

    image.thumb.png.60981ebf49e61768d88ab349fe996900.pngimage.thumb.png.78a202dfd4e27d877d090363b85dd91b.png

    P12

    image.thumb.png.0413a0662f1890b833f153c3f5d74501.pngimage.thumb.png.c12a3248e5a0df2d2db01a3e8039158b.png

    P14

    image.thumb.png.f19cc9537385c83f47fa972cb0318e52.pngimage.thumb.png.9d12ea2aee45d200a3d377565ea3e428.png

    P25

    image.thumb.png.81abb4934041fe5efd9f3c654e10dc9a.pngimage.thumb.png.9dbe98b8b1448f0ec3b3e9ced8c9f835.png

    Battleground / Southerly Tracking Low options

    P03

    image.thumb.png.cd56a9bf9c9b86d8de4be150023dc54e.pngimage.thumb.png.d21d1d4ab4bdcdb3f4b08f1b834e69b6.png

     

    A good few there to look at. Note P02, P04, P08, P10, P16, P17, P18, P21 (Worst one), P22 and P24 are horror show Christmas Day charts for coldies all with 850hpa temps widespread over the UK above 0C. P21 as indicated is the worst with +5C isotherm widespread over the UK. I don't recommend you view these unless as a coldies you want to throw up.

    • Like 4
  14. 4 hours ago, summer blizzard said:

    Regarding the SSW hunt, for those who want an early event like 2013 or 2021 its worth saying that the CFS is showing the next strong wave event in the Pacific passing between the 10th-20th December which should increase poleward heat flux. While the strength is not something i'd focus on with CFS, the timing should not be off. Given that we are early in the season though, we probably have to wait another ~month for the passage after but it's worth an eye on given that the vortex is already in some distress (or forecast to be) rather than continuing to cool and strengthen. 

    I notice this is starting to be a constant signal for vortex weakening on the GFS

    image.thumb.png.f5b1981d8905697f0a3e3bf1a1ffbc50.png

    Maybe we won't have a raging vortex for much longer.

    • Like 2
  15. 6 hours ago, Premiere Neige said:

    An interesting read and something I hadn't even considered:

    WWW.BBC.COM

    Extreme wildfires are increasing due to rising emissions, but they also disrupt the climate in return. Weighing up the overall impact, however, is tricker than it seems.

     

    Now we know how to guarantee the UK a cold winter every year. Not good news for Canadians though.

     

    • Like 2
    • Insightful 1
  16. 21 hours ago, CryoraptorA303 said:

    IMO they are still important milestones; they still hold the third and second hottest days ever recorded after all, for now anyway (I'm sure a few summers between now and the 2030s will have something to say about them). August 2003 will still be remembered for some time for the massive heatwave. 2019 I feel will fall into relative obscurity (like the August 1932 heatwave) rather quickly due to the lack of an accompanying prolonged heatwave. 2022's record is huge although I doubt it will remain for all that long. I see next year going above 40 again if Nino sticks to the dry spring script and then we get a hot summer after that. If not that then another heatwave will come up at some point and we'll pass it by the mid-2030s. Aside from that we will have more than a couple summers reaching into the high 30s between now and then and we'll almost certainly see more 38s and 39s in the meantime.

    The extreme high maxima in summer have typically come under ENSO Neutral or Weak/Moderate La Nina state during the summer itself. Aug 2003, July 2019 and July 2022 were all under Neutral or Weak/Moderate La Nina during the summer itself.

    The more generally warm summer months which set a monthly high mean seem more likely under El Nino or a developing El Nino. July 2006, Aug 1997 and July 2018 were all under developing El Ninos.

    Ongoing El Ninos don't often produce a record warm or daily extreme max and El Nino to La Nina summers typically turn out quite poor. 1998 and 2007 are perfect examples of this.

    • Like 1
  17. On 02/11/2023 at 20:08, damianslaw said:

    The last notably cold christmas was 2010! and that broke on the 27th. Last year the cold arrived a week or so too early.

    We've had brief colder interludes since 2010 over christmas, brief being the operative word, 2014, 2017 and more especially 2020. Alas the christmas week 24-31st has in recent years been mild or exceptionally so, last 2 years especially.

    We are overdue a cold one, the last cold last week of the year, was 14 years ago in 2009!

    Also the last cold week leading up to christmas was 2010.

    Not saying this will be the year to buck the trend, perhaps we might see a toned version of 2009, or more likely a 2000 Dec that brought the cold just in time for christmas after 3 months of relentness rain and wind..

    I think many places had an ice day for Christmas 2010 if I do recall and the mean CET daily value for the day was -5.9C.

    In fact 2010 was the last time we had notable cold leading up to Christmas, on the day itself and for a short time afterwards as well with a string of sub zero daily CET means from the 17th up to the 27th, the period averaged -3.93C.

    2009 wasn't quite as cold for the period 24th to 31st as you might think and was in fact less cold than the equivalent period in 2010. 2009 was 1.91C for that period compared with 0.39C for 2010. The Christmas to New Year period in 2009 was in fact the less cold period that was sandwiched between the pre Christmas cold from the 17th to 24th and the post New Year cold from 4th to 10th January 2010.

    The last week of 2000 also averaged colder than 2009 as well at 0.95C.

    The ideal lead up to, Christmas to New Year period and early 2024 period for me

    The perfect build up for me would be:

    2009 from 17th to 24th December     2000 from 25th to 31st December     2010 from 1st to 10th January

    17th     1.90C                                          25th      2.90C                                          1st     -0.50C

    18th     -0.90C                                         26th      1.10C                                          2nd     0.30C

    19th     -2.00C                                         27th      0.90C                                          3rd     -0.60C

    20th     -1.80C                                         28th     -0.20C                                          4th     -3.40C

    21st      -0.80C                                        29th     -1.90C                                          5th     -2.70C

    22nd    -1.40C                                         30th     -0.80C                                          6th     -0.50C

    23rd     -0.30C                                         31st     1.70C                                           7th     -4.60C

    24th     -0.40C                                                                                                           8th     -3.70C

                                                                                                                                       9th     -2.10C

                                                                                                                                       10th   -1.20C

    This is a broad idea of what I would want but if I wanted to be even more specific I would substitute 30th and 31st of 2000 and 1st to 3rd January 2010 for 30th December 1996 to 3rd January 1997 for extra snow.

    However the average mean CET for the singled out 3 periods above is a decent -0.66C so a nice sub zero lead up to, Christmas and New Year and opening to 2024 would do me nicely.

  18. 19 hours ago, Redbull165 said:

    And its happening. For the first time this year when El nino developed, we are seeing Enso area 3.4 warmer with anomalies than 1+2. Modoki El nino slowly taking its place.

    nino12.thumb.png.9aac2b74000436fd822cf4aaa06e8c03.png

    nino34.thumb.png.43628ea4974d478e3d51f4d876c6a23d.png

    Difference in last 7 days. The western part over the Pacific is seeing a lot of warming last few days, the eastern part quite the opposite around the coast of Ecuador.

    cdas-sflux_ssta7diff_global_1.png

     

    It's tipped even more towards modoki again today. A big jump in the anomaly in region 3.4 since just yesterday and a bit more cooling again in 1+2

    image.thumb.png.0360d1c5460c23927161fb122c367e0d.png

    image.thumb.png.b4d6fa8a79f878a266b62891c3b47c82.png

    What we really need however to make it a true modoki event is for region 4 to be somewhat warmer than 1+2 and Nino 3 to also cool a little bit too

    image.thumb.png.bcc706c8729fe84288d13ff5654857ff.png

    image.thumb.png.9d63cea9495cf1027f10d51c50d0e200.png

    • Like 1
  19. 1 hour ago, damianslaw said:

    Excellent post, good reasoning explained for likely developments for the winter ahead, albeit caveated, with lots of unknown impacts.

    Appears we will see something quite different to last winter, which brought coldest conditions very early on. This winter the chances for notable cold likely to increase as it wears on.

    It is looking increasingly likely the winter will start off on a changeable note with the atlantic westerlies largely ruling the roost, but perhaps not having its own way throughout whole of December. Incursions of polar air may well be a strong feature as we move through second half of the month. All a long way off, and I'll be giving my thoughts on the winter as a whole later in November, lets just say it could be one with quite significant interest for cold and snow lovers, even if it gets off to a no show on those fronts.. the coldest snowiest winters usually do! and include March in this respect.

    I'm dreaming of a White Christmas.

    If this proves true we look to be in with our best chance for years

    • Like 3
  20. How will 2023 as a year finish in comparison to the top 10 years on the CET record

    Currently up to the latest date of 15th November 2023 we are provisionally in 2nd position, just ahead of 2014 with only 2022 ahead of this year at the current stage

    15th November 2023

    1     2022     12.069                    7     1999     11.389

    2     2023     11.731                    8     1949     11.324

    3     2014     11.655                    9     2011     11.274

    4     1990     11.508                    10   2002     11.261

    5     2020     11.469                    11   2018     11.233

    6     2006     11.406

    Assuming the estimated CET mean values from the latest GFS 00z for the rest of November 2023 come true this will give a November mean of 7.8C.

    If this proved true then 2023's rolling mean would be 11.519C at the end of November 2023 which would still place us in 2nd position just ahead of 2014 with only 2022 higher than this year.

    Below I have what the average December CET mean would need to be based on the above in order to place above 2022, between any of the top 10 as well as the value required in order for us to fail to set a top 10 year.

    Year           Category                                           2023 Provisional CET mean        Details                                                                  
                       Dec 2023 = 9.67C (Dec 2015)        11.363C (+0.214C above 2022)   ANNUAL CET MEAN RECORD SMASHED
                       Dec 2023 = 7.17C or more            11.150C or more                           NEW ANNUAL CET MEAN RECORD SET
    1 - 2022     Dec 2023 = 7.15 to 7.16C              11.149C                                          2022 RECORD ANNUAL CET MATCHED
                       Dec 2023 = 4.97C (91-20 Mean)   10.963C (Easy 2nd position)       2022 RECORD SAFE - 2014 DOWN TO 3RD
                       Dec 2023 = 4.80C to 7.14C            10.949C to 11.148C                     2ND POSITION SET - 2014 DOWN TO 3RD
    2 - 2014     Dec 2023 = 4.79C                           10.948C                                          2014 ANNUAL CET MATCHED
                       Dec 2023 = 3.80C to 4.78C            10.864C to 10.947C                     3RD POSITION SET - 2006 DOWN TO 4TH
    3 - 2006     Dec 2023 = 3.79C                           10.863C                                          2006 ANNUAL CET MATCHED
                       Dec 2023 = 2.50C to 3.78C            10.753C to 10.862                        4TH POSITION SET - 2020 DOWN TO 5TH
    4 - 2020     Dec 2023 = 2.49C                           10.752C                                          2020 ANNUAL CET MATCHED
                       Dec 2023 = 2.05C to 2.48C            10.716C to 10.751C                     5TH POSITION SET - 2011 DOWN TO 6TH
    5 - 2011     Dec 2023 = 2.04C                            10.715C                                        2011 ANNUAL CET MATCHED
                       Dec 2023 = 1.64C to 2.03C            10.680C to 10.714C                     6TH POSITION SET - 2018 DOWN TO 7TH
    6 - 2018     Dec 2023 = 1.62C to 1.63C            10.679C                                         2018 ANNUAL CET MATCHED
                       Dec 2023 = 1.41C to 1.61C            10.661C to 10.678C                     7TH POSITION SET - 1999 DOWN TO 8TH
    7 - 1999     Dec 2023 = 1.40C                           10.660C                                         1999 ANNUAL CET MATCHED
                       Dec 2023 = 1.35C to 1.39C            10.656C to 10.659C                     8TH POSITION SET - 1990 DOWN TO 9TH
    8 - 1990     Dec 2023 = 1.34C                           10.655                                            1990 ANNUAL CET MATCHED
                       Dec 2023 = 1.20C to 1.33C            10.643C to 10.654C                     9TH POSITION SET - 1949 DOWN TO 10TH
    9 - 1949     Dec 2023 = 1.19C                           10.642C                                         1949 ANNUAL CET MATCHED
                       Dec 2023 = 0.95C to 1.18C            10.622C to 10.641C                    10TH POSITION SET - 2002 DOWN TO 11TH
    10 - 2002   Dec 2023 = 0.94C                           10.621C                                         2002 ANNUAL CET MATCHED
                       Dec 2023 = 0.93C or lower           10.620C or lower                         11TH OR LOWER SET - NO TOP 10 SET
                       Dec 2023 = -0.69C (Dec 2010)      10.482C                                         NO TOP 10 SET                                                  

  21. 27 minutes ago, damianslaw said:

    Any snow cold lover would love to open the first advent calandar window with this behind it.

    Can only think of 1 Dec 2010 similiar. With exception of 2010, many recent relatively cold starts to Dec, 2008, 2012, 2017 and 2022 imploded around or just after mid month. Im always nervous of early cold in first half of Dec, rarely stays its course in time for christmas, mind cold came christmas 08. On the opposite scale we have the likes of 95, 00 and 09 which started on a mild note, and were cold over christmas, 95 turned cold on the 5th.

    2000 and 2009 remain my comparators for December 2023..

    2000 is a good match for position in the solar cycle as well as an odd cycle too and an EQBO winter too. The major difference is ENSO which was La Nina in 2000 compared with El Nino now.

    2009 is a better match for ENSO as well as QBO but a poor match for solar cycle position and is in an even cycle as well.

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