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Showing content with the highest reputation on 25/10/17 in all areas

  1. 22 points
    Very intriguing question. Firstly I will show the modelling in a different light, compared to the determ models. This is the NAEFS (North American Ensemble Forecast System) model, which is actually a combo between GEFS and GEPS. Comparing it to EPS, provides a very useful outlook IMO, especially for longer range modelling. First the next 7 days worth of 500mb anomalies. Then the first 7 days of November. Big contrast between the ridge influence in Wk 1 and then the cold snap/trough coming over in Wk 2. Lots of others have pointed this out, but just showing it a little differently. Now for the question. The NAO is currently going into a negative phase. Beyond the 2-3rd Nov, it is expected to climb to positive neutral figures. I am not sure whether it is going to continue for a proper +NAO phase. The MJO is currently entering Phase 7. These phases (6+7) are deemed to the best for a -NAO(+10 days), which is occurring. The relationship with Scandi highs and Atlantic ridges and MJO is poor. EPS and GEFS (Bias-Corrected) MJO RMM plots above. The EPS shows a rapid decline to neutral MJO during Phase 7. GEFS shows a slower decline, entering the neutral realm at Phase 1. POAMA and the Canuck models agree with EPS, JMA is in between the main models. For longer range forecasts, the POAMA model provides a probabilistic (chance of MJO Phase) forecast for the MJO: For 11-15 Nov, 50-70% Neutral, 10-30% Phase 3. For 16-20 Nov, 50-70% Neutral, 10-30% Phase 1. For 21-25 Nov, 50-70% Neutral. For 26-30 Nov, 50-70% Neutral, 10-30% Phase 2. Overall this means that MJO will likely remain neutral over November, and if it strengthens later in the month, it is likely to be in Phases 1-4. Which correlates with a +NAO(+10 days). So in my opinion, we may see a +NAO setup come around in the 2nd or 3rd weeks of November (emphasis on the may). But I haven't looked at the PV, or any other climate driver, except for the MJO and NAO, in proper detail. It's kinda rushed, because it's getting late night here in Aus. I will have a proper longer range look tomorrow, provided the forum doesn't crash .
  2. 10 points
    Vortex sliced in two Some beautiful looking charts on the 6z Then we end up with cold air very close by in Europe not a bad way to start in November
  3. 6 points
    Have our first snowfall forecast amounts from the fine mesh model we use for our location . The period Sun 6pm -Mon 6am... 27cm at 1750 absl, heaviest during this period . Snowfall will become moderate to light during the rest of Monday, more showery with cloud breaking. By Monday morning , freezing level will be at 750m. So looks like piste team will soon get to start on important base preparation with longer term lower temps expected as well which will help the process. Getting excited ! C
  4. 5 points
    I think the most important thing here is that whatever model you look at, Europe is about to turn decidedly cold. A problem we've had in the past few winters is that Europe (at least the West) has been rather mild, so whenever we did manage to scrape an Easterly it wasn't particularly cold. Thanks Euro High. If we can get cold air into Europe and increase the snow cover, which it looks like we will, then we could be in a better position with heights being further North across Scandinavia this year. The continuous modelled splitting of the Vortex/Cross Polar flows is encouraging, but we did have the same kind of prospects this time last year and look how that turned out. In the mean time - Turning cooler, perhaps colder into Early November with maybe some snow across higher ground in the North. It'll be nice to get some widespread frosts, though. There's a lot of spread on the ENS, but a small cluster getting close to that -10c isotherm which is interesting..
  5. 5 points
    For me I just love the dark nights being cold and crisp, as the pas few years it's just been wet and mild. I had a feeling this winter would start different, not that I'm predicting a 62-63 repeat, the feel of the charts looks far from normal which for me indicated there is more chance of the extreme happening one way or another. Yeah, not technical but with Ophelia etc the atmosphere seems from from it's normal state which is only a help rather than a hindrance. Obviously it could, and probably will, be another mild, wet winter but as long as things seem volatile then that volatility could swing in our direction. Time will tell. Until then some nice seasonal weather to look forward too.
  6. 5 points
    Im not even going to dream big. 1 day of snow accumulating to 3-4 inches would be a better winter than the last 4 combined.
  7. 5 points
    A quick look at the ecm this morning albeit there no great changes from the previous run. By 12 Friday the high cell is over Ireland with the cut off upper low to the south west in mid Atlantic beginning to stir. But the high quickly comes under pressure from a trough tracking east via Iceland which is north of Scotland which initiates a fresh north west flow across the UK by midday Saturday. The low then intensifies and tracks swiftly SE to be over the south Baltic by 06 on Sunday as high pressure once again surges north to the west of the UK. This will veer the wind over the UK northerly but more to point bring gales to the North Sea. The aforementioned high pressure then ridges briefly over the UK but a combination of the troughs tracking E/SE to the north west and the upper low to the south have split the high pressure and the next frontal disturbances impact Ireland Monday evening and with much more affect on Tuesday bringing heavy rain and strong winds particularly in Scotland. The main low then again tracks SE into the North Sea over the next couple of days which once again veers the wind northerly introducing a cooler showery airstream. All pretty predicable.
  8. 5 points
    Are there signs of the models getting closer to agreement for early November? ECM GFS GEM . Definitely looks colder for everyone in these charts - might be windy as well but the best thing about it is that it should put a stop to the incessant rain we've endured for the last six weeks in this part of the world. I'm fed up with soggy weather and a cold snap with crisp mornings is the perfect forecast at this time of year.
  9. 4 points
    After a day off, the ECM clusters are back online. No clusters suggesting anything exceptionally cold, TBH, but the Euro slug is definitely off the menu in the short-term.
  10. 4 points
    Text book cross-pole split. V-good/favourable wave activity.....
  11. 4 points
    For those that know and can remember these things, I just wondered how similar the current set up is to November last year? Particularly the background signals? The reason I ask is that last November we saw snow here in Leeds and I thought this is a great set up for the Winter to come. Of course then we hardly saw another flake for the rest of winter and no more lying snow. Is there anything in the models to suggest this cold/cool snap will be anything other than a little blip before the PV gets organised and we are back to business as usual?
  12. 4 points
    Well *IF* the GFS is to be believed, the 0c Isotherm will be draped across the UK for over a week starting on the 1 November, so we should see some chilly temperatures. Whilst not cold enough for snow in low lying areas, the Scottish ski resorts should get off to a pretty decent start to their season. What's noticeable is that on the face of it the charts seem to to scream cold, such as this at 192 However, as it's so early in the season the uppers aren't as cold as you would imagine, we get -6 uppers over Scotland for a very short time but nothing colder. There just isn't enough cold air around to bring deep cold to our shores......yet. All in all though, good early signs and reasons to be cheerful for the coldies on here.
  13. 4 points
    I thought you guys might like this. So a guy elsewhere (obviously far more capable than i) has actually found a way to match as many areas of the ocean as normal to various telleconections and came up with this (the forecast cold spell in the US will also mean his October forecast will come out pretty well).. And the years he likes to make that of course are generally good.. 1932 (x2), 1943 (x3), 1944 (x3), 1996 (x3), 2005 (x3), 2007 (x3), 2008 (x2), 2012 (x1) From a CET point of view the only bad winter is 2007/2008 (though it mainly Jan and Feb that were bad). It's also worth looking at 43 and 44 because there's some evidence that the QBO cycle may have failed after the Nino of 41 as well, 1932 has been an abnormal match for a tonne of stuff including the hurricane season. The general gist is that Dec and Jan see high pressure over Scandi and the Arctic, pattern breaks in Feb and we see a weak westerly pattern.
  14. 4 points
    In the short term it looks a done deal for transition to cooler/perhaps colder shots via atlantic ridge placement. Dragging in north/north-westerly flow... Medium term: perhaps a more defined notable shot' via sharpening of alignment introducing a more elongated northerly plunge countrywide!... Some will argue' that-the tropospheric/stratospheric vortex(polar) being in disaray at such early stages is premature' for winter.... Personaly i could'nt like it any better atm..small waving dissallowing organisation at this particular juncture screams possibilites' at crucial winter point..... And northern hemisphercaly its easy to clasp' the pressure the beast is under..... Long may that continue!!!!
  15. 4 points
    Apologies for the problems overnight and this morning, we've found the cause now (disk failure). While we put a fix in place, there may be the odd period (of a few minutes of downtime) during the next hour or so.
  16. 3 points
    Just discussion on what the Model Outputs are showing in here please, There are the Model ramp and winter thoughts/hopes threads already open for anything other. Thanks please continue.
  17. 3 points
    It's an age thing. Sadly it's unlikely to improve from now on. Well this is going to feel rather chilly, if it comes off, especially for those of us in the NE.
  18. 3 points
    Snow's almost into the Baltic States now. Good increase in ice-cap too
  19. 3 points
  20. 3 points
    It was the late 1980s when the AMO began to shift into its warm phase (I'm sure the run of warmer winters afterwards is no coincidence) - I think it's beginning to shift back into the cold phase right now, so perhaps not too much longer to wait for some better winters + we have the solar minimum coming. Colder winters tend to occur just after minimum (obvious exceptions aside) - perhaps because the ocean surface anomaly patterns (resulting from zonality over the previous winter seasons) initially fight the atmospheric pattern (more favoured to blocking during the minimum). I have a theory (never had time to do the research to validate though) that proper easterly outbreaks are much less likely to get as far as the UK during the the warm AMO - partly because of the warmer N Sea, which increases the chances that shortwaves form and prevent the real cold from arriving, especially down here. Another theory is that when the pattern shifts into the cold AMO phase again, it will coincide with a notably cold W European winter during the switch; that should at least get tested in the next decade.
  21. 2 points
    This guy knows his stuff...
  22. 2 points
    A lovely autumn day with plenty of bright sunshine and a partly cloudy sky. The temperature today is 18 C and the wind strength is 2.5 mph WNW .
  23. 2 points
    As ever the weather loves to be unpredictable. So firstly our current anomolies are at -1.4 and -0.8 respectively. However.. The westerlies (probably MJO related) have completed their first full cycle since at least April. However.. Sub-surface anomolies are now very strong and still getting colder. .. Seems to me like this is either a last gasp or we are seeing a game of chicken, if we get another surge in the trades for a few weeks then we are going full Nina with those sub-surface anomolies. If we see repeated MJO cycles, the atmosphere may try fight.
  24. 2 points
    Pep Guardiola has blamed the match ball for City failing to beat Wolves in normal time The ball used is the same as what the Championship, League One & League Two use
  25. 2 points
    Definitely one of the most memorable weather events. Looking at the archives Im sure it was a lobe of the vortex dive-bombing into the UK
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