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GaWx

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  1. GaWx
    Today’s 10 day averaged CFS RONI run for Nov has dropped a little to between +2.75 and +2.70. It also suggests that near future 10 day means for Nov will probably drop a little lower since all 8 of the blue lines, the most recent runs, are lower than today’s mean of the 40 lines whereas the red lines are more balanced. It also suggests a similar small drop for Nino 4 and Nino 3 for the same reason. However, unlike the other 3 regions, Nino 1+2’s blue lines are balanced suggesting little near future change upcoming for its Nov forecast mean thus implying probably a slightly even more E based Nino:
  2. GaWx
    This is just like the strongly E based 1997 was in the first half of Nov, but is unlike the 9 other strong+ Ninos since 1959, which had either neutral or -PNA then.
  3. GaWx
    Looking at only Ninos of +1.4+ (per RONI), there have been 10 others since 1950 but only one (1997) had a +PNA dominant first half of Nov like GEFS says 2026 is going to have. GEFS is suggesting ~+1.0 (after adjusting downward for bias) for 11/1-15/2026. How does this compare to the other 10 actual 11/1-15? 2023: -0.1 2015: -0.2 2009: -0.3 1997: +1.2 1991: +0.1 1986: -0.9 1982: -0.3 1972: +0.1 1965: -0.5 1957: 0.0 I wonder if this strong early Nov +PNA in 2026 is largely due to how E based it is being that 1997 was so E based early. https://ftp.cpc.ncep.noaa.gov/cwlinks/norm.daily.pna.index.b500101.current.ascii
  4. GaWx
    Whereas the GEFS -AO looks significantly less impressive than yesterday, the +PNA still looks very impressive for at least the 3rd day in a row: 10/27 run: 10/28 run: 10/29 run: even a bit more impressive Granted, the GEFS has had a +PNA bias averaged out the last 3 months, but the bias has had only ~half the magnitude of its -AO bias, and it has been mainly after day 7. So, perhaps it’s a bit too +PNA late in the run but otherwise likely has the right idea. I’ll for now assume it has the right idea for the first half of Nov with a PNA of near or above +1 most of the days. What other Nino first half of Nov had a mainly +PNA that was pretty high? 2014, 2002, 1997, 1987, 1976, 1968, and 1953 with only 1997 being strong+.
  5. GaWx
    Thanks, Adam. Point taken, which @Typhoon Tipand many of us agree with. In case you missed it yesterday, Eric also suspects the occurrence of this very early SSW is connected in some way to the very strong and E based Nino: I have a sneaking suspicion that the extreme eastward shift (& intensity) of this year's El Niño potentially has something to do w/ the unusually early stratospheric warming event that's being forecast.
  6. GaWx
    The comparison of the following GEFS AO progs fits in well with its strong -AO bias the last couple of months: 10/28/26 GEFS run: look at all of the members plunging to sub -1 and even sub -2 during Nov 2-4 with the mean plunging to -1.5 on Nov 3rd: 10/29/26 GEFS run: what happened to the Nov 2-4 members going below -1? There’s only one left and the mean dips down only to -0.6 instead of -1.5 on Nov 3rd. Also, the medium range mean isn’t as -AO as yesterday: @Typhoon Tip
  7. GaWx
    Even if this SSW ends up not propagating downward to a significant degree and thus doesn’t lead to strong -AO/-NAO in Dec, just the fact that this very early SSW is occurring may have implications as to the chance of a subsequent major SSW (i.e., a canary in the coal mine) that actually does downwell significantly and thus leads to a strong -AO/-NAO after that as I think @40/70 Benchmarkhas talked about.
  8. GaWx
    John, As long as the 10 hPa/60N mean zonal winds reverse (go to <0) in Nov or winter, that event is defined as a major SSW regardless of the degree of actual strat. warming and degree of propagation down into the troposphere, if at all. If it doesn’t drop to <0, the strat warming event is called a minor SSW. Despite the reversal or at least near reversal being progged on models, the degree of actual warming at 10 hPa being progged has been tame compared to many other SSWs. So, that could very well be a factor to consider as regards its potential to later significantly disrupt well down into the troposphere. I wonder if that reduces that potential. Opinions? Check out this GFS prog, for example. The change in the strat. wind pattern at 60N looks quite impressive, but the degree of strat. warming up there doesn’t as there usually are widespread red colors, including dark red, that abruptly move into the area located within 60-90N but in this case the darker reds largely remain in and near Siberia:
  9. GaWx
    The Arctic N of 80N 2m anomalies have been back to their typical autumn warmer than 1958-2002 averages after a short dip to just BN at the end of Sept:
  10. GaWx
    Thank you. I stand corrected and that’s good to know. I knew that the CFS was doing that mainly in Feb with its massive W based -NAO/E Canada block, but didn’t realize that the models overall were doing much blocking earlier in the winter. That’s why I said “lack of seasonal model support”. This winter is about the most anticipated I can recall. We’re currently on page 266 ITT! Last year’s ENSO thread didn’t reach p. 266 til Dec 9th and it was only on p. 159 on Oct 28th! The ENSO thread from 2 years ago had only 260 pages in the entire thread! It was on only p. 147 on Oct 28th! Remember the last El Niño thread of 23-4 that we got all excited about? It had only 269 pages in total. “2021-2022 ENSO” had only 38 pages in its entirety and after page 27 it had already gone beyond that! “Winter of 20-21 Discussion” had only 9 pages.
  11. GaWx
    Why is Mark saying surface impacts are expected to start in mid-Nov? @Stormchaserchuck1said it takes 30-45 days, which wouldn’t be til Dec. Does he need clicks and likes that badly?
  12. GaWx
    Check this colder change from the EWs for week 2 (Nov 9-15): 1. H5 2 runs ago: Yesterday’s: Today’s: nice E US trough 2m from 2 days ago: Yesterday: cooler Today’s: even cooler Rainfall: 2 days ago: slightly wet SE Yesterday’s: a little drier Today’s: even drier with the colder air
  13. GaWx
    It’s not +3. It’s ~+2.6 per NOAA. Record for any week is +2.9: https://www.cpc.ncep.noaa.gov/data/indices/rel_wksst9120.txt Meanwhile there’s this to look at that shows strong +AAM still S of 30N: @40/70 Benchmark
  14. GaWx
    More from Webb about the SSW: The wave pattern that forces stratospheric warming events varies from case to case. Displacement events (wave 1) require an Aleutian low and a Scandinavian-Kara Sea block, but splits of the polar vortex (wave 2) do not necessarily. This particular stratospheric warming event actually starts out as a split type (wave 2), and then morphs into a wave 1/displacement type event as the Aleutian low becomes established later. The tropospheric trigger for this event is clearly traceable to the Eastern Pacific w/ divergent wind anomalies from active convection propagating poleward into N America and then eastward into the North Atlantic jet stream, eventually forcing the Kara Sea/Scandinavian block that sets this entire stratospheric warming event into motion. Also, note that early in the model forecasts, wave 2 amplitude dominates the -NAM/AO changes, wave 1 comes later and is largely confined to the mid-upper stratosphere initially at least.
  15. GaWx
    -1952-3 only barely missed a 2nd one in Jan with it getting down to +1 fwiw. -I had thought a +QBO reduced the chance for a mid to late winter major SSW during +1.3+ El Niño. However, upon further review, that may not be true: Here are the +1.3+ peaking El Niño events with a +QBO and whether or not they had a Jan 15th+ major SSW: 1957-8: yes 1982-3: no 1987-8: yes 1994-5: yes 2015-6: yes So, that’s 4 of 5 (80%) +QBO +1.3+ Nino with a Jan 15th+ SSW ———————— What about -QBO Nino winters? 1965-6: yes 1986-7: yes 1991-2: no 2009-10: yes 2023-4: yes So, that’s 4 of 5 (80%) -QBO +1.3+ Nino with a Jan 15th+ SSW. So, it’s a statistical tie for Jan 15th+ SSWs chances during +1.3+ El Niño.
  16. GaWx
    Webb is right. All but 3 of the 12 +1.3+ peaking Ninos had at least one major SSW Jan 15th+: 57-8: Jan 30th 65-6: Feb 24th 72-3: Feb 2nd 82-3: none 86-7: Jan 23rd 87-8: Mar 14th 91-2: none 94-5: Feb 4th 97-8: none 02-3: Jan 17th 09-10: two in Feb 15-16: Mar 5th categorized as an SSW but also by others as a near earliest FSW on record 23-4: mid Jan and early Mar
  17. GaWx
    Mitch, The modeled 10 mb/60N wind rise after the historic dip is by no means faster than what commonly happens with SSWs, especially early season SSWs. Looking at the image below, one can that the plunges downward from SSWs are often followed by pretty sharp rises soon afterward. By that time, the SSW has already done its “damage” so to speak. Look at the SSWs in here (circled). I count 8 SSWs prior to Jan 1st: 1952, 1958, 1965, 1968, 1981, 1984, 1987, and 1998 Most of these other than 1984 rose fairly steeply within a few weeks, which is what the models are showing for 2026 (assuming they will even be right obviously). Even some of those after Jan 1st rose steeply. @snowman19@Winter Wizard
  18. GaWx
    John, I’m being extra wary of the GEFS AO progs because they’ve been verifying significantly too -AO, especially in week 2: July 1st-Oct 28th verification: AO +0.6559 per image below vs mean GEFS progs of (all from image below): day 7: +0.287 (too -AO most days since Sep 1st) day 10: +0.0533 (too -AO since Sep 1st by larger amount) day 14: -0.086 (too -AO since Aug 25th by even larger amount)
  19. GaWx
    Thanks. I don’t doubt the bad actors! For me this is introducing more variability for Dec than I had assumed previously. Based on @snowman19posts on +QBO/ENSO analogs as well as my own research to confirm Adam’s mild E US forecast, I had been thinking mild Dec except possibly NN SE, especially deep SE. But with this historically very early SSW coming, I feel that there’s increased uncertainty for Dec. Per @Stormchaserchuck1the avg lag from an SSW to first getting well down into the troposphere early in the season is 35-40 days if I recall correctly. This would mean ~Dec 9-14 for it to first reach well down. And then it would last for a period of time (most likely 2-3 weeks minimum per history). Thus, this increases the possibility of a cold overall E US Dec, especially mid to late month and especially SE US, vs my prior thinking from very low to a nontrivial chance.
  20. GaWx
    Nino Nov 1-15 avg 10 mb/60N mean zonal wind (m/s) 26: projected +2 09: +15 04: +16 58: +17 06: +18 68: +18 77: +19 79: +20 76: +20 14: +21 72: +23 51: +23 87: +24 Avg: +25 94: +26 57: +26 65: +27 63: +27 18: +28 91: +28 69: +29 15: +30 02: +30 86: +30 82: +30 23: +32 53: +32 97: +34
  21. GaWx
    Per Eric Webb: interesting I have a sneaking suspicion that the extreme eastward shift (& intensity) of this year's El Niño potentially has something to do w/ the unusually early stratospheric warming event that's being forecast. I also wonder if there's a theoretical point where we shift the Indo-Pacific Warm Pool so far east that we actually don't end up getting a massive torch in December in the SE US & we just haven't observed an El Niño event strong/eastward shifted enough to challenge this idea. Perhaps, the trough that's normally buried in the Desert SW in December of a "normal" strong-super Nino bleeds eastward into the SE US instead, mirroring the eastward shift in convection/stronger subtropical jet stream forced by the extreme eastward shift in the mean warm pool. There are certainly some significant unknowns/wild cards on the table w/ this winter despite the normally high predictive power that comes with strong El Niños.
  22. GaWx
    Yes, they are by a good margin and that’s important. I’m not disagreeing at all and don’t think anyone is. I’ve pointed out a number of times about 26-7 being the most E based on record. But at the same time, we’re right to also point out that 3.4 is coming in weaker than progged, which is interesting and a fact and makes it even more E based but also means it’s coming in weaker officially. So, in future references to the official strength of the 2026-7 Nino, it appears it will not be as strong in the official table as what the Euro and BoM were predicting.
  23. GaWx
    Yes and no because the official ENSO strength is determined by Nino 3.4, which is what we’re referring to, rather than other regions. So, in terms of official strength, it technically is coming in weaker than these overshooting models. At the same time, it has become more E based than the models had due to the E regions coming in stronger.
  24. GaWx
    The BoM has been overshooting every near month forecast by a significant margin (0.4+) since April with it averaging 0.5 too high! Oct is joining the club: Here was the forecast for Oct as of just 2 weeks ago, which had Oct way up at +3.5: Look how far down the Oct 24th MTD is: only +2.8! So, full Oct is likely going to end up at no warmer than +3.0, which would make its Oct forecast verify 0.5+ too warm and thus continue the trend that started with April: This tells me that Nov will have a good chance to end up verifying ~0.5 too warm or at ~+3.2 vs its forecast of +3.7. Either Nov or Dec will very likely end up as the peak. So, if BoM monthlies were to peak at, say, +3.3, then the NOAA monthlies would likely come in cooler and peak at ~+3.0 and the trimonthlies would likely peak at ~+2.8, which is where I am currently (not much change from before).
  25. GaWx
    Mitch, I just realized I had a typo as I called the winds on those charts “anomalies”. I realize they’re not anomalies and are instead absolutes but for some reason I typed anomalies. Thus, I just corrected the original post. My original thoughts are unchanged. I think my erroneously originally referring to them as anomalies threw you off. So, the +5 and +4 are actual winds rather than being 5 and 4 above normal. Is that what threw you off? —————— Aside: Ignore the trolls. Apparently moderation is nonexistent here.
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