Winter 2024-2025 DISC

[CoastalWx]

5 hours ago, 40/70 Benchmark said:

 

Sigh

[40/70 Benchmark]

13 hours ago, CoastalWx said:

Sigh

What are your thoughts...similar, warmer, better?

[CoastalWx]

10 minutes ago, 40/70 Benchmark said:

What are your thoughts...similar, warmer, better?

Sigh as in “not again.”

 

I’ll be honest. I’ve never been as detached from winter. I just want it respectable. I don’t have any thoughts other than the default warmer than normal. 

[CoastalWx]

I actually wouldn’t differ snowfall wise from what you have. The weenie in me deep down thinks we’re due for a decent winter, but I’m not confident this winter is the one that will do it.

[CoastalWx]

I’ll say this. If we get a 6”+ event, I’m lying nude balls and weenie facing up while drinking a beer. 

[40/70 Benchmark]

1 minute ago, CoastalWx said:

I actually wouldn’t differ snowfall wise from what you have. The weenie in me deep down thinks we’re due for a decent winter, but I’m not confident this winter is the one that will do it.

I won't be suprised if the region is above normal in snowfall....but I need to be conservative after the past couple of busts.

[CoastalWx]

Just now, 40/70 Benchmark said:

I won't be suprised if the region is above normal in snowfall....but I need to be conservative after the past couple of busts.

I agree. Hoping we can get something fun. But I’m a broken weenie. 

[MJO812]

[Damage In Tolland]

Hope and pray as hard as you can that this final forecast is wrong. This is as ugly as the beer goggles girl you woke up next to the next morning .

[MJO812]

[Allsnow]

 

[Allsnow]

21 hours ago, 40/70 Benchmark said:

 

Great outlook! 

[ORH_wxman]

2 hours ago, CoastalWx said:

I’ll say this. If we get a 6”+ event, I’m lying nude balls and weenie facing up while drinking a beer. 

The year is 1990. Bruce Schwoegler just issued a forecast for 3-6" of snow. You immediately flip to channel 7 to see if Harvey Leonard is on board. He's similar but slightly less....3-5 inches is his forecast. You can't believe your eyes. We might actually get enough snow to cover all the grass blades and even shovel? You quickly change the channel again to channel 5 to see if Dick Albert is matching the other 2. Instead, it's Mark Rosenthal who is filling in that night. He says you might wake up to it "snowing to beat the band" and is forecasting 4-7". You almost faint from happiness.

We're back to the dark days of our childhood.

[Snowcrazed71]

1 hour ago, Allsnow said:

 

So is this source a reliable source? 

I haven't looked at their forecast before, but I also am in North central Connecticut.

[Great Snow 1717]

1 hour ago, MJO812 said:

page hits....

[40/70 Benchmark]

2 hours ago, MJO812 said:

 

23 minutes ago, 40/70 Benchmark said:

Yea, I honed in on that...here is in excerpt from my outook:

Western & Northern Pacific May Be Crucial for Winter 2024-2025

The winter pattern over the northern and western Pacific will play an instrumental role in dictating what type of variation is seen from the predominate MC forcing this winter season, especially since La Nina appears poised to assume a secondary role this year. Meteorologist Eric Webb has posited that an area of anomalously warm SSTs over the tropical Pacific in the vicinity of 150-160 degrees east longitude may be a reasonably skilled indicator with respect to the WPO during the ensuing winter season.

 

 

 The theory essentially is that anomalous sea surface warmth in the vicinity of 150-160 degrees East longitude in the tropical Pacific increases convection and convergence near the surface, which leads to negative outgoing long wave radiation (OLR) anomalies aloft, or divergence and sinking air. If this persists into the winter season, it correlates to the opposite pattern over the higher latitudes in the area of the Bering sea, which means sinking air and ridging at the surface in this area. This would obviously yield a -WPO pattern in the DM seasonal mean.

 

 

 

 

As a point of reference, here is the October SST anomaly profile in this area prior to the strongly negative DM period of 2013-2014.

 

 

And the resultant DM pattern.

 

 

Here is the October 2020 SST pattern preceding the strongly positive 2020-2021 season, which is the most prominent +WPO member of the variation data set.

 

 

Note the pronounced +WPO despite the variation within the PNA and polar domains that allowed for a prolonged early to mid season wintry interlude over the northeast.

 

Here are the October 2017 SST anomalies that preceded the more moderately +WPO winter of 2017-2018.

 

The WPO did not provide a particularly strong signal that season and the warmth over the east was subdued by the EPO/NAO blocking in tandem with +PNA.

 

 

Here is the October SST anomaly pattern that yielded a -WPO/+PNA reprieve from the predominate MC forcing during the 2021-2022 winter season.

 

 

And the resultant pattern that led to a noteworthy wintry interlude mid season in the absence of high latitude blocking over Greenland or the Arctic.

 

 

Here is the SST anomaly pattern from October 2022 that preceded the strongly positive WPO winter of 2022-2023.

 

 

The strong polar blocking in March was insufficient to overcome a hostile Pacific for the east coast, which was largely left unscathed, at least in terms of snowfall, by a stormy beginning and end to the season.

 

 

Finally, here is the SST anomaly chart from October 2024.

 

 

The SST anomaly profile this year most closely resembles that of the severely negative WPO seasons of 2013-2014 and 2021-2022. 

 

 

Considering this composite match, the forecast for the DM mean WPO value is within the range of -.40 to -.70, and given the strong tendency for +EPO among the cool ENSO deviation dataset, the JM EPO is predicted to register anywhere within a range of .30 to .60. This is anticipated as being the primary distinction between the coming season and 2013-2014, which also featured a severely negative JM mean EPO value of -.89, and was thus very cold relative to the modern climate. 

 

 

For the sake of perspective, a comparison between the North Pacific SST anomaly pattern in the Gulf of Alaska during October 2014 and 2011 are provided; each preceding contrasting extreme variations of the seasonal EPO pattern.

 

 

 

Note that while clearly October of 2024 represents a compromise that is as extreme as either depiction, it does more closely resemble the warmer, October 2011 anomaly, suggestive of a more moderately +EPO seasonal mean during the coming winter.

 

 

 

Lending credence to this forecast for a predominately +EPO/-WPO during the coming winter season is the subgroup of older extra Pacific analogs, including 1973, and 1974, which are uncoincidentally from the secondary PDO nadir just prior to the end of the previous Pacific cold phase, as well as 1954, 1955, 1970, 1971, 1999, 2007 and 2010.

 

 

This general idea has support from some seasonal guidance, granted it manifests differently with a more exaggerated southeast ridge during this modern era.

 

 

 

[40/70 Benchmark]

Another key part for the 95% who don't have the time or patience to reach through in its entirety.

The Paradoxical Relationship Between ENSO & MC Forcing in the Modern Climate

Perhaps the ultimate paradox with respect to La Nina is its potential relationship with pattern deviations, or "mismatches" from the very Maritime Continent forcing that embodies it. La Nina is normally associated with a central Pacific ridge.

 

 

This is due to the manner in which the ocean-atmosphere interface establishes the Hadley Cell.

 

 

Conventional logic dictates that stronger La Niña events would be associated with stronger, more prevalent North Pacific ridges, however, clearly the ridge preceding the much stronger La Niña of 1973 pales in comparison to what has been the strongest one on record in 2024.

This is the result of the current -PDO phase being enhanced by climate change due to an accentuation of the West Pacific warm pool. The byproduct is both a record negative PDO and associated North Pacific ridge, despite the pedestrian nature of the burgeoning cool ENSO event. 

 

 

Note the baseline cool ENSO nature of the Pacific Hadley cell over the past 25 years, independent of ENSO, as compared to the previous 25 years.

 

The latter is a virtual sea of negative departures relative to modern day, ambient heights, and is completely devoid of a discernible North Pacific ridge. This is in contrast to the former, in which the north Pacific Ridge is conspicuously prevalent amid very high global heights. This is what has led to the baseline MC forcing tendency that has evolved over roughly the past decade.

 

 

It has been stressed that La Nina is not going to play a very influential role this season, which may sound silly and contradictory since there is currently a record north Pacific ridge in place, along with a negative PDO of unprecedented strength to constructively interfere with it. And it absolutely is doing so, to an extent, as evidenced by the MEI and RONI values outpacing the ONI. However, unlike other recent La Nina events, ENSO is not the primary catalyst of this pattern. Rather, it is the immense, cool ENSO like baseline that is the driving force at play, and the reason that it is difficult to distinguish this is because the MC regime mimics that of La Nina. Be that as it may, the ENSO neutral state of the ONI in conjunction with the MEI and RONI currently only being reflective of a weak atmospheric coupling (ASO -.76) on the heels of a strong El Nino are incontrovertible evidence that the baseline MC forcing is the most instrumental catalyst around the hemisphere at this juncture.  The reason that this "chicken or the egg" distinction is so vital to the seasonal forecast moving forward is that while it is true that La Nina is generally associated with Maritime continent forcing, there are disparate variations of La Nina according to intensity and structure that can trigger deviations from the baseline MC forcing assuming that it is of sufficient intensity.

One of the most egregious of errors among a litany of fatal flaws with respect to the Eastern Mass Weather winter outlook last season was assuming that a weaker reflection of El Nino automatically favored a colder outcome. This is, of course, false, although it is true that historically speaking, weaker ENSO events tend to have colder results, which is illustrated quite well in the composites below.

 

 

Note in the juxtaposition of schematics above that the weakest events, on the left, have greater incidence of poleward Aleutian ridging and high latitude blocking in the mean, which understandably yields the colder result on average. 

 

 

 

This is due to the fact that weaker ENSO seasons are more prone to extra tropical influence, which can sometimes yield colder results, but not always. When the baseline regime is one that teleconnects to warmth in a specific region, as does the current baseline MC configuration for the east, weaker ENSO does not necessarily mean "colder" because it is more likely to "lose" that "competition" with said extra tropical influence. This was the case last season, when the more meager expression of El Niño in the atmosphere relative to the ONI was the result of the warm ENSO competing with, and losing to, the baseline MC regime. Conversely, while a stronger ENSO event is less prone to extra tropical influences that can favor cold, it also increases the likelihood of ENSO being the vehicle for deviation from a persistent baseline tendency. This is likely the reason that the intensity of La Niña was also linked to the increase in the duration and frequency of deviations from the baseline MC forcing in the earlier referenced research conducted by Bluewave of Americanwx forums.

 

 

The variation in the respective composites is considerable, as east-based events (left), and to a lesser extent, central-hyrbird events, have significantly more poleward Aleutian ridging and high latitude blocking than their Modoki, or west-based counterparts (right). The is because the Modoki convective forcing regime is very similar to that of the baseline MC forcing that is currently in place, and Modoki events are on average the strongest events of the three composites, which means that there is little opportunity for deviation from said pattern.

 

 

This MC forcing regime has remained very consistent throughout the Autumn.

 

 

 

Which is reflected in the precipitation anomalies given that the convergence and subsequent lift near the surface, below the divergence aloft, fosters positive precipitation departures from average.

 

This supports the Bluewave findings that the variation data set featured more intense episodes of La Nina, which matured and coupled with the atmosphere earlier, as evidenced by the greater October MJO amplification. This allowed for greater deviation from, and/or lower amplitude of the MC forcing during boreal winter, hence the pattern "mismatch" period that was more conducive for east coast snow and cold interludes. The prevalence of the MC forcing over the past decade has fundamentally altered the manner in which ENSO interacts with the extra tropical atmosphere and has in fact reduced its influence. Whereas weaker La Nina was previously linked to colder outcomes due to other extra tropical influences allowing for deviations from the cool ENSO baseline MC paradigm, said MC regime is now the general baseline, and thus La Niña needs to be even stronger to act as that crucial vehicle for deviations driven by its own structural nuances. It is with this in mind that is is important to also consider the intensity of the recent periods of mismatch from the MC forcing in order to determine the nature, duration and frequency of any potential deviation during winter 2024-2024.

Characterization of potential Mismatch Periods for Winter '24-'25

The 2017 east-based La Nina represented one of the more prominent examples of deviation, as it featured two significant mismatches from the predominate MC forcing.

The first was triggered in December, as the MJO was allowed to traverse phases 6-8 and contributed to the development of -EPO and +PNA blocking, which is the antithesis of the predominate MC pattern.

 

 

 

Then a lull in the MJO activity later in the season coincided with the downward propagation of a potent February SSW to contribute to historic NAO blocking in tandem with a significant -WPO ridging in the Bering sea.

 

Although the peak RONI of -1.26 and MEI (-0.7) are comparable to the expectation for 2024, the peak October MJO phase 6 amplitude of +3.353 is significantly higher than the phase 5 peak of +2.762 this past October. The peak ONI of -1.0 is also greater than the -0.6 to -0.8 expectation this season. Due to the higher ONI and significantly greater MJO amplitude during the month of October, the coming winter is unlikely to feature multiple deviations of this magnitude, nor it as likely to have as extensive NAO blocking given the central-based nature of the current La Nina is fairly similar to the prevalent MC forcing that is so inimical to -NAO. However, diminished likelihood of major NAO blocking is not prohibitive to colder, more wintry periods on the east coast.

 

January 2022 is perhaps one of the better analogs for any potential mismatch this season.  Although the peak ONI of -1.0 and MEI of -1.5 are slightly stronger than expectation for this season (-1.0 to -1.2 peak MEI forecast), the peak RONI of -1.24 is at the lower end of the forecast -1 to -1.2 range this season and the max October MJO phase 5 amplitude of 2.087 is significantly less than that of this past October. 

 

 

 

Furthermore, this -WPO/+PNA tandem seem a more plausible deviation this season considering the previously discussed state of the North Pacific, whereas an NAO driven, December-January mismatch seems relatively unlikely for reasons already disclosed.

December 2020 into February represented a very protracted period of disconnect from the baseline MC forcing, which was largely muted by a weakened MJO response. While the October MJO peak of 2.117 in phase 6 is comparable to October 2024, the comparisons largely end there. Peak ONI of -1.3 was much stronger, and while the peak MEI of -1.2 is not a particularly poor match, the RONI was slightly stronger at -1.54. The safe interpretation would appear that any deviation this season will be both shorter in duration and of a different ilk, given that the WPO was severely positive.

 

 

The final mismatch analog to be considered seems relatively sound from a frequency and duration standpoint, as the 2022-2023 Modoki La Nina registered a peak ONI of -1.0, RONI of -1.13 and MEI of -1.7. While La Nina seems somewhat stronger than the current event, this is likely negated by the fact that it was west-based and this would only seem to reenforce the MC regime. Additionally, the peak October phase 6 amplitude of 2.177 was significantly less than this year. This is not only a superior duration and length of amplitude analog, but it represents a wonderful illustration of why west-based events are not immune to bouts of blocking within the polar domain, as will be discussed shortly. This season featured a modestly disturbed polar vortex early on, not unlike December 2020, however, the Pacific was much more hostile, which is a theme that was repeated with an even stronger, SSW induced round of blocking in March. Should this degree of blocking evolve again during the coming season, it would likely yield a somewhat snowier and colder outcome for the east coast due to the anticipated differences in the north Pacific. The caveat being that a late season round of blocking is neither as likely to take place, or to be as intense as March 2022 due to solar considerations that will be touched upon shortly. Now that a clearer portrayal of the anticipated impact of the interaction of ENSO with the predominate MC baseline and the type of deviation that may result has been provided, it more appropriate to consider the final piece of the puzzle remaining for winter 2024-2025.

[snowman19]

2 hours ago, MJO812 said:

Who gives a shit what Eric Webb says?

[40/70 Benchmark]

Just now, snowman19 said:

Who gives a shit what Eric Webb says?

See....this is the awful mindset that I had originally assumed as it pertains to you and Bluewave, but a funny thing happens when you stop succuming to bias and automatically dismissing certain people...you learn a few things.

[40/70 Benchmark]

EVERYBODY has something to contribute and offer...don't care who they are.

[brooklynwx99]

2 minutes ago, 40/70 Benchmark said:

See....this is the awful mindset that I had originally assumed as it pertains to you and Bluewave, but a funny thing happens when you stop succuming to bias and automatically dismissing certain people...you learn a few things.

lol apparently Ben Noll is the harbinger of truth while Webb is useless. wonder why

Webb is a pompous ass at times, but he is a smart guy

[40/70 Benchmark]

1 minute ago, brooklynwx99 said:

lol apparently Ben Noll is the harbinger of truth while Webb is useless. wonder why

Webb is a pompous ass at times, but he is a smart guy

Everyone is wrong sometimes....its how you learn to be right more often, and develop some genuine humility along the way, which makes it easier to not dismiss anyone.

[CoastalWx]

30 minutes ago, 40/70 Benchmark said:

Another key part for the 95% who don't have the time or patience to reach through in its entirety.

The Paradoxical Relationship Between ENSO & MC Forcing in the Modern Climate

Perhaps the ultimate paradox with respect to La Nina is its potential relationship with pattern deviations, or "mismatches" from the very Maritime Continent forcing that embodies it. La Nina is normally associated with a central Pacific ridge.

 

 

This is due to the manner in which the ocean-atmosphere interface establishes the Hadley Cell.

 

 

Conventional logic dictates that stronger La Niña events would be associated with stronger, more prevalent North Pacific ridges, however, clearly the ridge preceding the much stronger La Niña of 1973 pales in comparison to what has been the strongest one on record in 2024.

This is the result of the current -PDO phase being enhanced by climate change due to an accentuation of the West Pacific warm pool. The byproduct is both a record negative PDO and associated North Pacific ridge, despite the pedestrian nature of the burgeoning cool ENSO event. 

 

 

Note the baseline cool ENSO nature of the Pacific Hadley cell over the past 25 years, independent of ENSO, as compared to the previous 25 years.

 

The latter is a virtual sea of negative departures relative to modern day, ambient heights, and is completely devoid of a discernible North Pacific ridge. This is in contrast to the former, in which the north Pacific Ridge is conspicuously prevalent amid very high global heights. This is what has led to the baseline MC forcing tendency that has evolved over roughly the past decade.

 

 

It has been stressed that La Nina is not going to play a very influential role this season, which may sound silly and contradictory since there is currently a record north Pacific ridge in place, along with a negative PDO of unprecedented strength to constructively interfere with it. And it absolutely is doing so, to an extent, as evidenced by the MEI and RONI values outpacing the ONI. However, unlike other recent La Nina events, ENSO is not the primary catalyst of this pattern. Rather, it is the immense, cool ENSO like baseline that is the driving force at play, and the reason that it is difficult to distinguish this is because the MC regime mimics that of La Nina. Be that as it may, the ENSO neutral state of the ONI in conjunction with the MEI and RONI currently only being reflective of a weak atmospheric coupling (ASO -.76) on the heels of a strong El Nino are incontrovertible evidence that the baseline MC forcing is the most instrumental catalyst around the hemisphere at this juncture.  The reason that this "chicken or the egg" distinction is so vital to the seasonal forecast moving forward is that while it is true that La Nina is generally associated with Maritime continent forcing, there are disparate variations of La Nina according to intensity and structure that can trigger deviations from the baseline MC forcing assuming that it is of sufficient intensity.

One of the most egregious of errors among a litany of fatal flaws with respect to the Eastern Mass Weather winter outlook last season was assuming that a weaker reflection of El Nino automatically favored a colder outcome. This is, of course, false, although it is true that historically speaking, weaker ENSO events tend to have colder results, which is illustrated quite well in the composites below.

 

 

Note in the juxtaposition of schematics above that the weakest events, on the left, have greater incidence of poleward Aleutian ridging and high latitude blocking in the mean, which understandably yields the colder result on average. 

 

 

 

This is due to the fact that weaker ENSO seasons are more prone to extra tropical influence, which can sometimes yield colder results, but not always. When the baseline regime is one that teleconnects to warmth in a specific region, as does the current baseline MC configuration for the east, weaker ENSO does not necessarily mean "colder" because it is more likely to "lose" that "competition" with said extra tropical influence. This was the case last season, when the more meager expression of El Niño in the atmosphere relative to the ONI was the result of the warm ENSO competing with, and losing to, the baseline MC regime. Conversely, while a stronger ENSO event is less prone to extra tropical influences that can favor cold, it also increases the likelihood of ENSO being the vehicle for deviation from a persistent baseline tendency. This is likely the reason that the intensity of La Niña was also linked to the increase in the duration and frequency of deviations from the baseline MC forcing in the earlier referenced research conducted by Bluewave of Americanwx forums.

 

 

The variation in the respective composites is considerable, as east-based events (left), and to a lesser extent, central-hyrbird events, have significantly more poleward Aleutian ridging and high latitude blocking than their Modoki, or west-based counterparts (right). The is because the Modoki convective forcing regime is very similar to that of the baseline MC forcing that is currently in place, and Modoki events are on average the strongest events of the three composites, which means that there is little opportunity for deviation from said pattern.

 

 

This MC forcing regime has remained very consistent throughout the Autumn.

 

 

 

Which is reflected in the precipitation anomalies given that the convergence and subsequent lift near the surface, below the divergence aloft, fosters positive precipitation departures from average.

 

This supports the Bluewave findings that the variation data set featured more intense episodes of La Nina, which matured and coupled with the atmosphere earlier, as evidenced by the greater October MJO amplification. This allowed for greater deviation from, and/or lower amplitude of the MC forcing during boreal winter, hence the pattern "mismatch" period that was more conducive for east coast snow and cold interludes. The prevalence of the MC forcing over the past decade has fundamentally altered the manner in which ENSO interacts with the extra tropical atmosphere and has in fact reduced its influence. Whereas weaker La Nina was previously linked to colder outcomes due to other extra tropical influences allowing for deviations from the cool ENSO baseline MC paradigm, said MC regime is now the general baseline, and thus La Niña needs to be even stronger to act as that crucial vehicle for deviations driven by its own structural nuances. It is with this in mind that is is important to also consider the intensity of the recent periods of mismatch from the MC forcing in order to determine the nature, duration and frequency of any potential deviation during winter 2024-2024.

Characterization of potential Mismatch Periods for Winter '24-'25

The 2017 east-based La Nina represented one of the more prominent examples of deviation, as it featured two significant mismatches from the predominate MC forcing.

The first was triggered in December, as the MJO was allowed to traverse phases 6-8 and contributed to the development of -EPO and +PNA blocking, which is the antithesis of the predominate MC pattern.

 

 

 

Then a lull in the MJO activity later in the season coincided with the downward propagation of a potent February SSW to contribute to historic NAO blocking in tandem with a significant -WPO ridging in the Bering sea.

 

Although the peak RONI of -1.26 and MEI (-0.7) are comparable to the expectation for 2024, the peak October MJO phase 6 amplitude of +3.353 is significantly higher than the phase 5 peak of +2.762 this past October. The peak ONI of -1.0 is also greater than the -0.6 to -0.8 expectation this season. Due to the higher ONI and significantly greater MJO amplitude during the month of October, the coming winter is unlikely to feature multiple deviations of this magnitude, nor it as likely to have as extensive NAO blocking given the central-based nature of the current La Nina is fairly similar to the prevalent MC forcing that is so inimical to -NAO. However, diminished likelihood of major NAO blocking is not prohibitive to colder, more wintry periods on the east coast.

 

January 2022 is perhaps one of the better analogs for any potential mismatch this season.  Although the peak ONI of -1.0 and MEI of -1.5 are slightly stronger than expectation for this season (-1.0 to -1.2 peak MEI forecast), the peak RONI of -1.24 is at the lower end of the forecast -1 to -1.2 range this season and the max October MJO phase 5 amplitude of 2.087 is significantly less than that of this past October. 

 

 

 

Furthermore, this -WPO/+PNA tandem seem a more plausible deviation this season considering the previously discussed state of the North Pacific, whereas an NAO driven, December-January mismatch seems relatively unlikely for reasons already disclosed.

December 2020 into February represented a very protracted period of disconnect from the baseline MC forcing, which was largely muted by a weakened MJO response. While the October MJO peak of 2.117 in phase 6 is comparable to October 2024, the comparisons largely end there. Peak ONI of -1.3 was much stronger, and while the peak MEI of -1.2 is not a particularly poor match, the RONI was slightly stronger at -1.54. The safe interpretation would appear that any deviation this season will be both shorter in duration and of a different ilk, given that the WPO was severely positive.

 

 

The final mismatch analog to be considered seems relatively sound from a frequency and duration standpoint, as the 2022-2023 Modoki La Nina registered a peak ONI of -1.0, RONI of -1.13 and MEI of -1.7. While La Nina seems somewhat stronger than the current event, this is likely negated by the fact that it was west-based and this would only seem to reenforce the MC regime. Additionally, the peak October phase 6 amplitude of 2.177 was significantly less than this year. This is not only a superior duration and length of amplitude analog, but it represents a wonderful illustration of why west-based events are not immune to bouts of blocking within the polar domain, as will be discussed shortly. This season featured a modestly disturbed polar vortex early on, not unlike December 2020, however, the Pacific was much more hostile, which is a theme that was repeated with an even stronger, SSW induced round of blocking in March. Should this degree of blocking evolve again during the coming season, it would likely yield a somewhat snowier and colder outcome for the east coast due to the anticipated differences in the north Pacific. The caveat being that a late season round of blocking is neither as likely to take place, or to be as intense as March 2022 due to solar considerations that will be touched upon shortly. Now that a clearer portrayal of the anticipated impact of the interaction of ENSO with the predominate MC baseline and the type of deviation that may result has been provided, it more appropriate to consider the final piece of the puzzle remaining for winter 2024-2025.

That's an impressive deep dive. Good stuff. 

 

I really haven't paid much attention to the warm poo stuff, but I just plotted precip rate since 1/1/24 and can see that in the same area as the VP stuff shows above. It's interesting that the SST anomalies in the area where convection drives the pattern aren't very warm from an anomaly standpoint...but do increase with latitude as you head toward Japan...water is warm there as well and can help influence the pattern. 

 

 

[WxWatcher007]

43 minutes ago, 40/70 Benchmark said:

Everyone is wrong sometimes....its how you learn to be right more often, and develop some genuine humility along the way, which makes it easier to not dismiss anyone.

And that applies across all facets of life.

[Typhoon Tip]

i'm actually never wrong ... it's so weird -

heh quite the fantastic telecon convergence in the d10 to 15 range ...

granted, not the whole winter   lol   but, mm ...we're far enough into the season now  etc etc to at least consider an early expression - sort of leaving that open-ended there on purpose  haha. one cannot wisely say much in a trump-civility, because the inherent incivility of what that means will not operate within the confines objective constraint or reality, when it comes to interpretation 

anyway, this signal from about the 21st to the end of the month is actually promoted to a big one at this point.   big for what tho.  for now at least a pattern move from a warm-like one to colder once over central/E n/a is higher than normal probability - relative to this sort of time range.     

[Typhoon Tip]

this is a gfs ens mean from 12z ... if this were later on in dec certainly jan, we'd really be in business for some sort of correction event(s), as this is newly arriving off a pna mode shifting some 1.5 total sd, going negative to positive, while both the nao is western limbed, and pac up stream is in the AB phase -

[Typhoon Tip]

regardless of whatever ecmwf org statemens/faqs purport about the new dissemination of the 340 hour operational run, if it is anything other than a marketing ploy .. .utilizing the model's unique proclivity for destruction porn ... it's a lie!

[Typhoon Tip]

kidding there ... but, the euro - i suspect - will not operate with any restraint in the extended, more so than the other guidance, this cold season.   i've just too often in the past looked at that model on d9's and thought ... damn!   if only this model went out 2 more days.   

[bwt3650]

38 minutes ago, Typhoon Tip said:

i'm actually never wrong ... it's so weird -

heh quite the fantastic telecon convergence in the d10 to 15 range ...

granted, not the whole winter   lol   but, mm ...we're far enough into the season now  etc etc to at least consider an early expression - sort of leaving that open-ended there on purpose  haha. one cannot wisely say much in a trump-civility, because the inherent incivility of what that means will not operate within the confines objective constraint or reality, when it comes to interpretation 

anyway, this signal from about the 21st to the end of the month is actually promoted to a big one at this point.   big for what tho.  for now at least a pattern move from a warm-like one to colder once over central/E n/a is higher than normal probability - relative to this sort of time range.     

That would be great timing to start some actual winter weather...now, can you give us the "what could go wrong" for that time period?

[Typhoon Tip]

1 hour ago, bwt3650 said:

That would be great timing to start some actual winter weather...now, can you give us the "what could go wrong" for that time period?

well ... for now, let's get the pattern to succeed in moving from the recent warm complexion, to a colder one.   that much i'm higher confidence.  however, it is still necessary to get the cold synopsis machinery working ... without it, 'what can go wrong' precedes the question

- the only cons i see for now ( memo from the 'what can go wrong' department ) is that because the index prognostics are a bit more unstable in the transition seasons, that takes some confidence away. 

- additionally, in recent decade(s) there has been less stability with telecon predictions - probably owing to increased mid latitude, base-line wind velocities effecting the spatial and spatial-temporal ( both ) wave#s   2015 is really the last time a rossby signature set up and locked.  it's sort of been that long...  lots of roll-outs/ and pattern changes with shortened lease tendencies, etc.