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Interesting he mentioned this , seems a lot of his followers are wondering what the hell he is talking about. Could be he wants some likes of the comment or maybe he believes it. Depends what side of the fence you are one. But, at the 12 hour mark that is a crazy jet stream.

Some folks are talking about why the seasonal models are going with a mostly positive NAO and a + AO in the winter forecasts. Simon believes it is due to the models seeing a stronger winter PV. IMHO I don't see that. Sure, it may, as others stated, get stronger in November, but off the charts strong well I am not so sure. Also, the pattern supports some attempts at weakening the PV and don''t forget the descending QBO as well. Maybe @Isotherm could comment. I read from one source that the signal for the + NAO and + AO also may be related as to how the seasonal models see and resolve oceanic SST profiles. However, a great video from BAMMwx recently mentioned that most model SST forecasts out in time are not correct. I forget the exact wording but he stated they are only correct 19 % of the time. He also mentioned that the model, NMME or close to that, is notorious for being too warm. So since the oceans play such a huge role in driving the pattern if those seasonal models are off in forecasting future SST profiles, then the seasonal temp forecasts will be off along with other outcomes. This is also a great addition to this topic, from Zac.

Maybe November is closer to normal in the states. Here in the East looks average to above based on this. Of course things could change. Don S. thinks the East could be warm after the first week of November. I was really hoping for a colder month. Certainly snow cover should build over Canada, possibly at an above climo rate, and wondering if we get some extreme cold air mass to develop also in time later in the month up North. Looks like continuation of the same old thing to a degree.

On another forum one met claimed the GFS should not even be used. Stated that by incorporating the GFS into your forecast for your clients it reduces your overall performance and accuracy. I know yesterday I posted about verification against the Euro, but when I read that comment I was surprised. Seems the general idea is the GFS is extremely cold biased, reacts slowly to changes and when you have time periods such as this where we are transitioning between seasons it does badly.

Although there appears to be some similarities I doubt we go down that same path again. As I mentioned a simple elongation towards us or at the least keeping the PV in check is fine with me. As you know , many blamed the SSWE last December and what lead up to it as one reason, among many , ( QBO . meager Nino, weal Pac jet , etc. ) for the poor performance of the seasonal models and many mets as well. Personally the one thing I like to see change is for the PNA to go positive, and for ridging to develop closer to the West Coast. It seems the way things are playing out the jet then reacts to this flow with a pumping up of the WAR , so a trough out West and a ridge in the East. This needs to change in the weeks ahead or at least transition to a better Pac. I know bluewave mentioned the SST configuration in the PAC and how the warmer waters out there may feedback this. Borrowing a image from a crankyweather post you can see those warmer waters. But things are changing again with the SSTS and will see what happens when we get later into the Fall . The image shows the trough in the East but currently it is more so in the West. I use the image simply to view the warmer water configuration. Lastly, when you think about that image below it is more so related to what Paul describes here ( see below ) So when we go more towards a Nino look hopefully the East will benefit. Paul Roundy @PaulRoundy1· Oct 23 You get the direction of causality mostly backwards. The high SSTs in that region are a consequence of ridging there, more than the other way around.

I see even HM graced Judah's post, not something you see everyday :-) Wonder whether this roll out is somewhat different from last year in a way, as it may yield a colder early December , similar to early December last year , but where this year may differ is that we do not return to a warmer regime like last December when things looked great in late November and early December and then BAAM we lost the good pattern in mid-December. Also, the caveat here for this December again may be what some referred to last year as a bootleg - NAO, and the interplay of the Scandinavia block.

True, but as a follow up. The GFS is falling out currently. Both models were challenged though by the huge amplifications in the Pac jet with the recent Typhoons. Seems the GFS always trends towards the Euro, however recent verification scores point out the GEFS doing better. And of course no model is perfect, and a blend seems to be a smart move to utilize each model's inherent strength.

Well, someone is wrong here

Less warm , is the new cool

A possible evolution regarding the PV going forward, seems plausible. I see HM posted on the topic as well. So, generally speaking a strengthening, but hopefully not going crazy. Then after this a weakening again. Well, time will tell. Of course after last year's SSWE debacle I would be happy a a simple and favorable elongation of the PV and a general weakening, no need for anything further than that IMHO. And HM's recent post:

Thanks, very interesting. I concur regarding the NAO. Do you see us eventually exiting the persistent - PNA pattern to one more Nino like in time? The contrast of players currently is enough to make your head spin. Very high IOD ( but think it is past the peak ) , high PMM , crazy TNI number, very fast PAC jet and a lack of West Coast ridging. Maybe things re-shuffle to a colder pattern in the East as we get to December. Surprisingly a couple private met commodity forecasters are calling for a cold December in the East with snow potential. That is contrary to many whom have stated the winter gets off to a slow start. On a side note, simply using longer wavelengths in December with the current PMM provides a very cold month in the East.

Cool animation , simply happy to see we are gaining snow coverage up North, pretty much in all areas. Also, note the big gains in Eastern Canada later in the loop. Courtesy 33andrain by Snowy Hibbo << Posted 5 hours ago Large increase in the Siberian and North American snow cover over the next week or so FWIW. And this happens as Arctic sea ice is at a record low... >>>>>>>

This is a great visual , simply click the image for a close up and scroll You can see some of the things Ray spoke about in his update. The kelvin waves, as Ventrice has posted on the past month, are having an effect. The warming in general and the Eastern Areas warming slightly. I am still very interested in the TNI as well.

Great read from @40/70 Benchmark over in the New England forum. His main winter outlook is set to be released on 11/12/19 . OCT 24 Confidence Grows in Late, Marginal El Nino Rapidly Evolving ENSO At the turn of the month, when ENSO neutral conditions were all but a foregone conclusion for winter 2019-2020, it was noted on this site that the warmth in ENSO region 4 was a fairly strong climatological indicator of a burgeoning el nino. As the month of October has evolved, the support has grown stronger. As of October 16th, region 1.2 has increased from -1.0c to -0.2c, region 3 from -0.1 to +0.4c, region 3 from +0.4c to +0.8c and region 4 from +0.9c to +1.1c. Not only has the western flank of region 3.4 and 4 continued to approach moderate levels, but the eastern flank has also began to warm. The implication of this are twofold: 1) Although it will likely take until the NDJ tri monthly period to verify, a weak el nino ONI will likely by achieved. Since 1990, 1991 (strong), 1997 (super), 2002 (moderate), 2009 (moderate) and 2015 (super) have registered equal or greater magnitude of warmth on the western flank of the ENSO regions in mid October. Significant el nino events ensued in all five of these seasons. 2) The subsurface warmth is penetrating the eastern regions of 3 and 1.2, thus a decline in the modoki value has ensued. Even a cursory glance at the subsurface provides a clear depiction of why this has taken place, and will likely continue. Morphologies Driven by Subsurface Much like the fall of 2018, not only are we observing a continued trend toward a marginal el nino, but we are also seeing it build from west to east. Thus the structure is gradually becoming more cannonical as it develops. The continuation of this trend is not only portended by the translation of the warmest subsurface waters eastward through region 3.4 and towards region 3, but also by modoki guidance. Note that on the annotation above, the current burgeoning warm ENSO event registers as roughly +.75c on the modoki scale, which is strongly modoki on par with the 1977-1978 event. However as the warmer subsurface waters continue to translate eastward, it is forecast to descend to approximately a +.40, which registers as moderate and on par with seasons such as 1979, 2006 and 2015. As the moderate classification would suggest, the result for the ensuing winters is very variable across the area, ranging from meager snowfall to the snowiest winter on record. While 2015 appears to be the best ENSO match at this time, one important distinction is that this particular event grew into a modoki, whereas this event, much like this past season's, is forecast to trend potentially more cannonical as it evolves. Conclusions This will be the final installment before the Eastrern Mass Winter outlook is released on 11-12-19, but there remains a great deal to ponder in the interim. Although the Climate Prediction Center has curiously reduced the odds of an el nino event to a mere 29% as of the Friday 10/18 update, we have grown ever more confident of a very delayed and modest el nino event that will likely peak in the NDJ tri monthly timeframe. The warm ENSO event will likely register moderately on the modoki index during its tri monthly peak, which implies mixed results with regard to its implications for winter. SEASON Peak Tri Monthly ONI Value Peak Tri Monthly Modoki Value Boston, MA Snowfall Wilmington, MA Snowfall Worcester, MA Snowfall New York City Snowfall Baltimore , MD Snofall 1951-1952 +1.2C SON +.04 39.6” 62.5" 63” 19.7” 14.1” 1953-1954 +.08C OND +.19 23.6” 23.5" 31.2” 15.8” 22.1” 1958-1959 +.06C NDJ +.52 34.1” 52.7” 64.7” 13.9” 4.0” 1963-1964 +1.4C OND +.43 63” 91.7” 66.6” 44.7” 51.8” 1968-1969 +1.1C DJF +.92 53.8” 86.5” 75.7” 30.2” 18.6” 1969-1970 +.09C SON +.20 48.8” 74.6” 72.1” 25.6” 21” 1976-1977 +.09C OND -.14 58.5” 97.3” 74.5” 24.5” 11.1” 1977-1978 +.08C OND +.79 85.1” 99.5” 85.9” 50.7” 34.3” 1979-1980 +.06C NDJ +.43 12.7” 19.9” 19.1” 12.8” 14.6” 1986-1987 +1.2C NDJ +.52 42.5” 77.7” 93.6” 23.1” 35.2” 1994-1995 +1.1C NDJ +.69 14.9” 22.5” 24.9” 11.8” 8” 2002-2003 +1.3C OND +.48 71.3” 86.8” 117.3” 49.3 58.1” 2004-2005 +.07C OND +.55 86.6” 107.5” 114.3” 41.0” 18.0” 2006-2007 +.09C OND +.32 17.1” 34.5” 49.1” 14.7” 9.1” 2014-2015 +.07C NDJ +.49 110.6” 115.5” 119.7” 53.8” 28.4” 2018-2019 +.09C OND +.52 27.4” 47.5” 51.4” 20.5” 18.3” The best ENSO analog just so happens to be the snowiest winter on record for the vast majority of Massachusetts, given both the anticipated intensity, delayed onset and moderate modoki value of the developing warm ENSO event. However this particular event has developed a bit later, and is also descending in modoki value, as opposed to ascending as the 2014 event did. We will explore possible implications of these subtle differences, as well as a myriad of other global factors that will account for the composite variability in the winter outlook set for release on 11/12/19

Ray, do you see any drivers over whelming the ENSO? Some private mets that run natural gas and ag consulting are really hammering the QBO and the low solar background state. Also, several mets are even mentioning we experience a combo in a new analog era of a hybrid ENSO - a combo of both Nina and Nino characteristics. What are your thoughts on them, if you can comment partially, prior to your seasonal release . Thanks

Northern and central North America gain significant snow cover in the next 10 days with this pattern. Likewise Siberia/Eurasia snow cover exploding and the area below 60 N looks to do well. DT's video shows a powerful upper low end of the month there, should end up strong . Sure looks active for us as well. Active is good . And yeah, more snow in Denver for my daughter. Some have all the luck!

A little comparison focusing on HDD from BAMWX GWHDD verifications for the 8-14 day lead in the GEFS and EPS so far. The EPS has a glaring warm bias with its longer lead HDD forecasts https://mobile.twitter.com/bamwxcom/status/1186645988397735936

I'm going in , sorry ass bitches

@C.A.P.E. Another area to look at is the TNI. When you look at this ENSO metric it is very difficult to find a usable analog because the present value of - 3 there have only been a handful of times it has been that negative, as pointed out on the recent blizzard of 96 blog. I looked back to 1946 and doing a quick scan only saw the value at - 3 or lower four times. 2002 and 2004 , I believe they both had cold Decembers . .

Focusing just on wavelengths , there may be some surprises as we enter December. The PMM has an interesting association once wavelengths change. Posted on that a while ago but since then the PMM has only gone higher. There have been some years, when looking in the past, where the pattern did change later in November and brought a favorable wintry period to our area in early December lasting into the middle of the month. Maybe that shows up in the weeklies once past early November.

Fits the Seasonal outlook. For those that follow the weeklies may I suggest......... some Zoloft

I am not liking this set up. Warm waters shifting further West in time. Wonder if this effects the middle Pacific and feedback towards a WAR.

More for informational purposes but I am sure there is a link to sensible weather, regardless is rather sad indeed.

Big time NA snow cover advance in the days ahead. This is really essential for cold air delivery in the early season .

A great pattern for those North of us in about 30 to 45 days, somewhat a gradient pattern for them.