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March or BUST! - Pattern & Model Discussion


Baroclinic Zone

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Lot of big hits on the 06z GEFS and the 00z EPS too. But we're now getting inside 72 hours to go time...need to see some more OP runs biting. Ukie has been big but  would be nice to see others go for it. Tight window which still is a bit worrisome but the good news is that even on these wide right solutions, some decent precip is being generated pretty far west...likely aided by the northern stream diving in and extending back an IVT. 

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I’d be pretty surprised at this point if this isn’t at least a SECS for eastern sections. Teleconnections are primed. 0z EPS and especially 6z GEFS were red herrings that the respective op runs were OTL. The H5 downstream ridging and positioning of UL trough both looked better for a track closer to the coast, which for whatever reason failed to translate on the ops.

Also with respect to the GEFS- the mean was signficantly more amped than the op; pretty telling imo. And there were a lot of members 965-975 about 150 miles east of the cape. Hard not to get excited about this one at this stage. Eastern New England is sitting pretty right here...

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Looking strictly at the European suite of guidance from last night (cuz that's all that really matters right?), from the operational run, I thought the western ridge trending slightly better, but the Great Lakes vort trended slightly worse.  In the end, the surface reflection trended slight better.   But overall basically held serve from 12z yesterday.

The EPS overall maybe trended a hair better, but looks to have held.  If anything, the individual runs consolidated around the mean. 

The northern vort at 00z last night appears to have initialized over the western Canadian coast.  So it's "on land" this morning.  Still a pretty data sparse region no?  Maybe we get a Boxing Day like jump in the last 48 hrs? 

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10 minutes ago, Chrisrotary12 said:

Looking strictly at the European suite of guidance from last night (cuz that's all that really matters right?), from the operational run, I thought the western ridge trending slightly better, but the Great Lakes vort trended slightly worse.  In the end, the surface reflection trended slight better.   But overall basically held serve from 12z yesterday.

The EPS overall maybe trended a hair better, but looks to have held.  If anything, the individual runs consolidated around the mean. 

The northern vort at 00z last night appears to have initialized over the western Canadian coast.  So it's "on land" this morning.  Still a pretty data sparse region no?  Maybe we get a Boxing Day like jump in the last 48 hrs? 

Yeah the vort sampling issue could be legit. I know we weenies lean on that whenever a solution doesn't quite give us what we want, but it is a real phenomenon. I believe one of the shortwaves in the January system suffered from poor sampling and became progressively stronger as it moved into a better environment. We'll see. I'd like to see more operational interest by 0z tonight or this may be a no go, at least back here. Also want to see that ridge continue to get more pumped to force a quicker drop in by the northern stream. 

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It looks like the angle of attack of the northern stream on the GFS is acting more to kick this east/northeast right now. We're not getting the slide-in-the-backside (any takers?) look we like to pull it in close and stall it. Blocking looks like it shifts subtly east relative to some earlier runs, which may argue for a less steep drop in angle. Maybe slightly higher heights over the Atlantic? 

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1 hour ago, ORH_wxman said:

Lot of big hits on the 06z GEFS and the 00z EPS too. But we're now getting inside 72 hours to go time...need to see some more OP runs biting. Ukie has been big but  would be nice to see others go for it. Tight window which still is a bit worrisome but the good news is that even on these wide right solutions, some decent precip is being generated pretty far west...likely aided by the northern stream diving in and extending back an IVT. 

The bigger hits are the slower ones, I've noticed we have been at 72 hours for a while now.

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1 hour ago, jbenedet said:

I’d be pretty surprised at this point if this isn’t at least a SECS for eastern sections. Teleconnections are primed. 0z EPS and especially 6z GEFS were red herrings that the respective op runs were OTL. The H5 downstream ridging and positioning of UL trough both looked better for a track closer to the coast, which for whatever reason failed to translate on the ops.

Also with respect to the GEFS- the mean was signficantly more amped than the op; pretty telling imo. And there were a lot of members 965-975 about 150 miles east of the cape. Hard not to get excited about this one at this stage. Eastern New England is sitting pretty right here...

Writing to the general reader here ... a "straw-man argument"

Those bold words above are about all this system has in support, which is typically a signal that many have trouble wrapping their heads around in lieu of actually seeing a stem-wound beauty of a cyclone on the charts. However, one way or the other, the teleconnections win.  Sorry ... I don't personally feel very comfortable using the UKMET as a deterministic fall-back at any time ( it does have support as suggested below).

These teleconnector curves and/or numbers ...they are not just numbers that we associated to certain meanings ... They actually are, for all intents and operations, reflecting mass distribution - literally... For example, if the NAO numbers are "down", there must by physical law be counter-balancing regions of mass that either alone or in the aggregate sum up to equal and opposite amount of "up."  Simple precept:  Mass is neither lost or destroyed in the ongoing maelstrom of the planetary system's circulation.  

Understanding that probably provides also the seeds to understanding what is meant by a "corrective event."  ...If one of these indexes, say the PNA were to enter a period of time where the numbers are changing ...that means that the counter-balancing mass fields to the PNA (usually internally, around the edges, or nearby adjacently) will also then forced to enter a period(s) of adjustment.  If a static synoptic atmosphere, conditions enter a calm state, but when perturbed by said forcing ... that "disturbs" said rested state = coastal ..or tornado...or whatever.

That's at the root of it all really... at all scales for that matter.  The sun heats the air mass over the interior land regions on a summer day until  it becomes buoyant; that air starts to rise (that's akin to a teleconnector entering a phase change); the rising air instantiates a surface return flow of cooler stable oceanic boundary layer air to replace it.  This response/balancing mechanism cools the coast.  Thus, one would say, 'there is teleconnection that signals cooling on the coast' with the onset of a sea breeze.  One regions mass was perturbed, and the a conjoining region was forced to change. We just don't label teleconnections for all scales, intents or purposes in that manner.

Where we do is at the grander scope of hemispheric Meteorology... If the PNA is forced to significantly alter its phase state ... there is a teleconnection over N/A accordingly.  

So ..the reason I am going through all this is because we may very well not receive a meaningful impact event this week, despite the PNA change ... despite all this arguing for a 'corrective event'.  However, there is a storm system that is going to evolve - that much is clear, and much to perhaps the chagrin of the hopefuls.  Don't conflate missing out on a storm/disappointment therein, as some sort of failure in all this.  We are not defeating the physical laws of mass distribution in the atmosphere when one is not happy with the outcome. It may seem obvious or silly to say.. .but, I've often read disgruntled people try to blame teleconnector adherence as some sort of set up for their misfortune, when it was the ...channeling of model cinema and/or storms for their happiness that was the real problem. 

There's also a question of thresholds, too.  A region can be perturbed, but not enough.  In this situation, however, I'd estimate changing the PNA from - 3 SD to +1.5 is probably enough, and well .. every GEFs member has 'some' kind of storm.. Again, impacting NE is not really a physical prerequisite for satisfying the above theoretical application. 

Just remember ... the "boxing day storm" ... that one was flattened down to pancake wave status ...and didn't come back until it was 36 hours out.  T 

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