Typhoon Tip

yeah there's interesting weather prior to the balance of what interests people in here today. That could be a potent squall and wind event, west to east, through the region Wed evening. Southerlies gust to 45 or even 55mph, with a sharp wind shift and burst to 60 and blinding swept rain for 3-5 mins with that ribbon echo. Interesting turn around in temperatures ...with an 18 hour cool snap that goes quite a bit in the other direction by Saturday... Then we'll see how things modulate next week. The idea of the blocking is likely to pan out... but the variations in how it effects the flow and what particulars that will entail still has plenty of room to move around in guidance after Saturday

For what it’s worth… Probably nothing for this group but Saturday may just be very nice out of doors if it doesn’t get too windy. By Sunday we have a really impressive negative EPO structure with a very intense cold plume channeling down the eastern front range of the Canadian Rockies towards Manitoba in this operational Euro run. Insane gradient from the border states to Florida

There’s also a subtle tendency to delay the onset of -EPO … which others seem to interpret as a zonal regression? It’s still a curvilinear flow around the Alaskan sector given more time, however. As far as the -EPO … it’s really kind of required to set the -NAO into retrograde d(amp) through complex/transitive wave transmission … I mean you can see the sequencing of the hemisphere spanning 10 or so days. First the EPO —> some sort of Dec 7..8 trough ejection through the east —> big chunk of warm hgts/advection surge up the western wall of the semi permanent W Atlantic ridge, which migrates into the lower D Straight where it marries in and triggers repositions the the -NAO from the eastern toward the western limb of the domain.. It all started back in the C-NE Pacific in the mid range. It’s fascinating really. How the PAC transmits a wave signal around the globe like that. …anyway with all those moving pieces going on over the next 7 to 10 days I mean it’s utterly in germane to even consider what a singular model guidance is illustrating on day 8 through 15+ but I get it… people are bored. Plus there’s a little bit of addiction to excitement going on when it comes to the stuff that’s another discussion lol. All this stuff looks really intriguing but it doesn’t mean jack if we gotta wait 10 days …looking out the window and it looks like it does right now which is completely uninspired. So all that people have to talk about is really their addiction withdrawals lol

Yes it establishes a better footprint there, but I think it’s also hinting at some of the compression/limitation associated with too much velocity that we were talking about earlier…

Not sure I see what you guys are talking about reading the GEPS … Looks like two cutters and a big Ohio high pressure as the major identifiable features through the end of Oh cause I’m looking at the 00z version.

But gives everyone nothing in the dailies lol

Unrelated to meteorology per se but it seems that area of the world has a history of these kind of single pop detonation out of the blue… I.e. Krakatoa and the like. Tambora too. I’m not sure that Krakatoa or Tambora gave very many warning signs before hand? I’m not sure that. But this thing just showed up.

Yeah that’s true over the long haul… However we have to consider each case within its own merit. I mean it’s kind of the same logic of climate doesn’t predict the weather; the weather creates the climate. It just means that something more apt to happen in the middle of the winter can certainly happen at the bookends - even if it’s a little less likely to have that take place. Blah blah. But you know I don’t actually dislike the idea of more light to middling events like you mentioned because I’ve been toying with that myself frankly. Maybe even a flat icer. If the ridge retrogrades west like Will and others are mentioning… Clippers are an option too. I agree that if one is searching for bigger players … a relaxation is preferred. Maybe we can even get into a +0 to -2 weekly oscillation with the NAO … Get a +PNAP return state then we’re really carving fillet mignon

Mmm … in fairness? that is not AS true for the NAO.

This will probably spark some debate… Or be ignored – not sure. But you can see how the NAO is actually the more nonlinear wave response from the Pacific as its source for construction just by observing how the polar jet across the North Pacific is behaving in tandem. it’s a meaningful observation because it harkens to the idea that this may not just be a random block that comes and passes over a three day period. It is more systemically rooted. Don’t have a problem with the occurrence I have a problem with the other aspects I mentioned above in that other post

It is but in all honesty … yeah, I find myself a little concerned. What underpins the expectation relates to ‘too much of a good thing’ I’m not likely to take the any operational GFS solution verbatim … its overnight renditions of the NAO block were comically extreme. I mused internally, ‘it’s like it’s gathered up all the last 25 years worth of CC and stored it over the Davis Straight’ But it does harken to the overkill compression problem that can overwhelm from Texas to Bermuda with meat grinder velocities The ensemble means of the GEFS and EPS are less epic block SDs … but even they hint at velocity anomalies within eastern conus region/trough I’m less concerned about NAO blocking merging with west Atlantic perennial heights …—> cutter pattern. But like Feb 2007 if the ridge is berserker and backs SW, the polar jet forced through the TV region basal flow rate is over a 100kts. S/Ws get absorbed as opposed to generating goodies The other aspect is… we are all hungry to get winter going as fans of the season and model cinema addicts (LOL). But seriously, there’s been no mentioning how NAO prognostics are still the biggest backstabber index forecast problem that exists to deterministic techniques in this field. I’ve been thinking about this but haven’t brought it up because the arctic oscillation, which is a little bit more dependable, has been exceptionally negative in the outlook from all guidance sources and techniques for quite some time and they obviously share domain space as does the North Pacific etc. etc. That tends to foot the NAO.

Here’s something comPLETEly relevant to this forum. Northern perfecters of Japan look like they might get one of those OES avalanches

It’s unlikely the NAO domain space collapses and merges in that way in late autumn early winter. That type of behavior is a spring phenomenon, as/when the wave lengths abruptly transition through the seasonal shortening - support washes out and the residual mass field settles south. April etc it can lend to one of those early 85/19 type T/DP red flag patterns.

I'm not sure I see a circumvallate containing spatial area the size of three Texas' at or beneath -20C at 850 mbs as being any kind of cold being left in Siberia... Okay, perhaps in the scalar sense? Sure, it's not -45C N of Lake Superior. Winter's over... There's nothing there that is 'going wrong' either way. lol - Guys I will admit that 'something' can and probably will, given the time range, 'go wrong'. We're psyched over a pattern look that's post D7 - that seldom ends even above the 90th percentile of expectations. In the rare occasions... like really rare, it goes above that. Barring the 1995 or 2015 redux, if we got 70% of the present look ( fair spit ball) to verify, we're probably batting better than .500 in the dailies. And there'd be enough cold air.

I can just hear some day's meme of, 'yeah, snow pack is overrated' ... It's really popularized quite affectingly when there is in fact no snow cover, too. LOL. But it is perhaps more important than many may think. Particularly for marginal/mixy overrunning scenarios. If one likes ice storms ( ...other than needing their head examined...) that's the difference between 32.8 and 31.1 for ageo flows that drain from that source.

What, you don't read minds?! lol - No, I mean wrt the pattern. That's where my mind spoke internally, but then I only managed to type ~ half of that internal dialogue there haha. Yeah, I mean the pattern is attempting to get extraordinary, in both the GEFs and EPS means. I mean the D10 in the 00z EPS and both the 00z and 06z GEFs appears to be nearing some kind of H500 historical value in the NAO, doing so within an entire hemisphere that's exceptionally deeply descending Arctic Oscillation. The only reason why the AO is "only" -2 or so SD out there, is because the whole hemisphere is biased mild ( maybe that's a CC tugging at that...I dunno - not getting into that...). But, that structure is about as pure a total bifurcation of the PV as is fluid mechanically possible at total planetary scales. These operational runs ...more or less oscillating their runs around impressions that are not "yet" tapped into what all that "could" mean. The embedded events of which ...it's like you are looking Betelgeuse ... knowing that a super nova could detonate at any time. In the models, we are just waiting on the nova to materialize out of that potential.

Something extraordinary is trying to set up out there in between the 7th and 20th of December ...

I can understand the 'frustration' - even though there really should not be based upon indicators, nor the content of what some have described in conveying those indicators. See ...one is dealing with a spectrum of approaches to this subject matter. It's a bit of a philosophical perspective, but ownership of sophistication in any discipline ... unfortunately is typically going to be owned by a select few in the general human condition/group. Those whom are either gifted, educated, or both. For the population density that makes up the bottom of the "pyramid", ...where is hootin' and hollerin' court yard din of the provincial pathos caries on, the information becomes beautiful art. Sideways insults aside, ...when these tools begin to illustrate x-7-q out in a-b-c time range, ... then lets the pyramid mull around with it, they are going to get a pallet of colorful interpretations going, and among those will be impatient hues. I'm being tongue in cheek... Seriously, I would not imagine given the 'indicators' and techniques that much occurs before ~ Dec 5. I mentioned yesterday that there might be a correction event signaled between the 5th and the 10th of Dec. It's still out there... The +1.5 delta in the PNA is what that is based upon, but not just that... Doing so just after there has been a -30 C 850 mb loading event as far S as southern Saskatchewan, Manitoba and western Ontario ... sort of makes the assumption of volatility an easy make. It doesn't have to create a bomb... It can all manifest in different ways. It's just that it's 7+ days away

Early snow distribution like that is actually not that unusual enough to be "fascinating" really? Not from my experience during later autumn into early winter climo over eastern N/A. I mean, if we get to Feb 1 and it's still like that, sure. I'll bet anyone dollars: tipping the flow up the coast with warm gales, while a polar jet dives thru the mid west shows up in the event annul/catalogues fairly often from mid Novembers through Christmas. I mean fwiw, I personally lose anecdotal count how many times I've seen trees leaning in turbine gusts ... bathing the MA and NE in 60 DPs, while wet snow was upsloping from WV to eastern KT. It seems like the return rate on that is 1::4 if not 1::3 for years with that storm type. Just happened 2 winters ago on Xmas - although that's a bad example because we had already put snow down in a solid pack before that massacre took place. My point is ... in the lesser extreme sense, just having the flow orientation favor the cold west, first, isn't "that" unusual. In fact, ... I actually covet a kind of good feeling as a winter enthusiasts, whenever the trees lean - because I can recall enough occurrences where within a couple of weeks of those event types, hell broke lose. So much so that I've begun to unconsciously associate: 'ooh that means...' It's not a huge mystery why that were the case. -EPO --> cutter and warm surge up the coast --> neutral EPO (+PNA) --> boom.

Hmm.. The AO is getting impressively negative, harder to ignore. Even considering the mop-ended members at the CPC, that's a massive signal - whether the operational version does or does not reflect that mode/modality out there toward week-2 at this time or not. Just a cursory look ..it doesn't, but the dailies in the extended have plenty of cold hydrostats spanning the Canada shield above the border, and occasional synoptic bleeds down to ORD-BOS (~). Enough to assume there's shared signal there if perhaps obscuring in the daily din of the runs. The EPS at D10 from what I've seen is structurally into the negative phase state above the 60th parallel on whole, but just a spatial surmise ... probably less than the GEFs? The overlap with the NAO is also impressive, with timing and concerted signaling way out there toward week-2. That's unusual to see all members, other than nuance differences ..., essentially exhibiting the same modality with that particular typically stochastic index. Short version? polar field telecon convergence big time toward the 2nd week of Dec, and given to the neg EPO happening during the run-up time span ... these signal cold ( and likely...) stormier times. No problem from my personal assessment. The PNA is also ( btw...) signaling there should be some kind of correction event ( H.A.) between ~ Dec 5 and 10.

Anomaly renditions also aren’t helping perceptions there I think. I mean at least a little… Some users see ‘warm’ tones and it’s not inspiring or triggering the dopamine. Heh. But I suspect we’re going to find more so going forward over the decades that it’s more about the geometric structure than it is about anomaly colorization pallets because thats going to be biased in the warm tones so long as it’s being compared to last century etc and CC is what it is.

So it's beginning to look cyclic wrt the EPO. The ensemble means re-emerge the signal, but hold it in position, like a standing wave pattern. That telecon/mass field doesn't behave that way though. More likely the ridge collapses south into/forcing +PNA ...follows within a week either a whole-scale repeat, or the hemisphere goes a different direction ... This appears to be doing the former, with a similar -EPO signal prior to what took place bac around 7th-12th of the month. The operation GFS has some unrealistically deep cold waves gong on out there in the deep range, but I figure that for typical amplitude isolating out in time.

-maybe it'll dawn on folks that ENSO just isn't as factorable as it used to be

Yeah so...I don't know what others thought are at this point. I'm sort of in and out with holiday travel - But I see attempts to fumble around with the hemisphere and the -EPO may not be dead. I don't see the recency with that index as necessarily an isolated occurrence in time - tho that could prove to be the case, I think less likely. I've felt this way all along, and the EPS is showing -EPO/western limb, but with cold loading pattern into western Canada with classic new and/or re-surge -EPO forcing after a week or so. Meanwhile, the GFS operational...despite SE ridging, keeps sending NW mid and upper trop trajectories through western Canada - whether that is representative of a -EPO ..that is probably vestigial if not a nod to the EPS. I guess the short version is that I am not pessimistic as a winter enthusiast for December. If the EPO does renew, ...yeah, I don't have a problem with sending a warm up through the eastern continent, at least for 3 ... *but* with the faster CC transition season velocity bias ..we keep having to seemingly/mandatory move into new regimes faster than initially thought. I realize that -ENSOs tend to x-y-z a winter to hell and back ...but I'm also becoming less of a fan of ENSO factorization in recent deltas/decade(s)/gradually

Not to be a douche, but the NJ model idea isn't new for this thing. I was trying to encourage the forum last week that the canvas hemisphere really supported the NJ look, rather than the stem-wound and/or Miller A... Nor the Lakes cutter, either - credit your dipping tendencies with -NAO for that. So, gradually ... the models got that memo. Fast moving more open wave that may or may not have some vestigial potency. And you're right - perhaps the thermal profile being more not like 1987 (1986). Those were some NJ model low examples. Marginal leading atmospheres. They could also just be called November model lows... they tend to be the favored flavor as the gradient starts to steepen and warm seasons initially resists.. Anyway, ..as is, it's not actually even very marginal - although the 00z Euro sort of hinted, with that pocked 850 mb layout.