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April 2021 Discussion


Torch Tiger
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9 minutes ago, Damage In Tolland said:

Did you? I assumed it never made it into E MA. How much? Will be interesting to see if the end of week rain also dwindles as we approach. It went from 2-4” yesterday’s to near. 1” this morning 

.03 or something like that. Just a narrow band.

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Regardless of any other impacts ... whatever happens between 96 and 132 hours is likely to over-perform QPF-wise.

More advance concepts: East wind anomalies extend very deep in the atmosphere, and though this system does not fan/evacuated due to accelerating entrance jets ...it has a vertically stacked easterly jet that extends from 850 mb to and over the 300 mb of tropospheric depth - that enitre slab of saturable atmosphere rips westward for 30 straight hours, into and **while** the core heights drop an additional 6 to 10 dm... due to dynamic feed-backs. That means there is a steady ratio of instability and that much mass transport into that bucket space will end up in the buckets on the ground to put it nicely.  Terrain enhancing as a factor maximizes ... Local studies perform very proficiently in that synoptic evolution. Eastern Berks rise, the Worcester Hills/Monadnocks into the lower Whtie's due very well.

 

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1 minute ago, Typhoon Tip said:

Regardless of any other impacts ... whatever happens between 96 and 132 hours is likely to over-perform QPF-wise.

More advance concepts: East wind anomalies extend very deep in the atmosphere, and though this system does not fan/evacuated due to accelerating entrance jets ...it has a vertically stacked easterly jet that extendes from 850 mb to the over 300 mb in tropospheric depth - that enitre slab of saturable atmosphere rips westward for 30 straight hours, **whilre** the core heights drop by an additional 6 to 10 dm... That means there is a steady ratio of instability due to dynamic feed-backs ...and that will like local studies the hell out of the eastern Berks and the Worcester Hill/Monadnocks into the lower lifting terrain of Whtie's

 

Ballsy call at this juncture.  Good luck.

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3 minutes ago, Typhoon Tip said:

Regardless of any other impacts ... whatever happens between 96 and 132 hours is likely to over-perform QPF-wise.

More advance concepts: East wind anomalies extend very deep in the atmosphere, and though this system does not fan/evacuated due to accelerating entrance jets ...it has a vertically stacked easterly jet that extendes from 850 mb to the over 300 mb in tropospheric depth - that enitre slab of saturable atmosphere rips westward for 30 straight hours, **whilre** the core heights drop by an additional 6 to 10 dm... That means there is a steady ratio of instability due to dynamic feed-backs ...and that will like local studies the hell out of the eastern Berks and the Worcester Hill/Monadnocks into the lower lifting terrain of Whtie's

 

Can also see how this could go farther west leaving SNE is pseudo dry slot with heaviest qpf Catskills into C PA. We’d get rain, but not a ton 

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18 minutes ago, Damage In Tolland said:

Can also see how this could go farther west leaving SNE is pseudo dry slot with heaviest qpf Catskills into C PA. We’d get rain, but not a ton 

Presently ...the most dependable operational guidance types/ .. blends therein agree that the structural evolution will move perfectly under our latitude ( 1997 style).  That absolutely pegs climatology ( to very high percentile) for lashing SNE.

That would have to change in order for the bold to succeed. 

Which ... it can, but all these guidance/ .. blend therein would have to up and be flat wrong ( as of 00z) on a D4.5.  Getting strained to believe that would be the case .. There has also been cross-guidance and multi-ensemble member continuity more like the 00z/ .. blend evolution for a deep number of cycles ... extending back day's worth actually ... just sayn'

 

 

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32 minutes ago, moneypitmike said:

Ballsy call at this juncture.  Good luck.

If you read the paragraph that follows ... it is not such a brave outlook - 

Whether it happens ... it's relative to guidance/implictions therein - guidance could be en masse be wrong.  sure

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49 minutes ago, Typhoon Tip said:

Regardless of any other impacts ... whatever happens between 96 and 132 hours is likely to over-perform QPF-wise.

More advance concepts: East wind anomalies extend very deep in the atmosphere, and though this system does not fan/evacuated due to accelerating entrance jets ...it has a vertically stacked easterly jet that extends from 850 mb to and over the 300 mb of tropospheric depth - that enitre slab of saturable atmosphere rips westward for 30 straight hours, into and **while** the core heights drop an additional 6 to 10 dm... due to dynamic feed-backs. That means there is a steady ratio of instability and that much mass transport into that bucket space will end up in the buckets on the ground to put it nicely.  Terrain enhancing as a factor maximizes ... Local studies perform very proficiently in that synoptic evolution. Eastern Berks rise, the Worcester Hills/Monadnocks into the lower Whtie's due very well.

 

I agree. At least as modeled now, that could be a siggy QPF look. 

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9 minutes ago, CoastalWx said:

I agree. At least as modeled now, that could be a siggy QPF look. 

I'd def be keeping an eye on it over the interior. That is a pretty classic look for some late season fun.

Odds are still that it ends up a miserable rain event with some marginal wet snow in the elevated interior, but you cannot rule out a much more significant impact.

 

EPS looks pretty ominous actually....that's a pretty classic firehose sig.

image.png.86f3dcb03ef42ed65bd969aee7cb092b.png

 

image.png.053510d6cc1fc9764c8a369e302afb54.png

 

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43 minutes ago, ORH_wxman said:

I'd def be keeping an eye on it over the interior. That is a pretty classic look for some late season fun.

Odds are still that it ends up a miserable rain event with some marginal wet snow in the elevated interior, but you cannot rule out a much more significant impact.

 

EPS looks pretty ominous actually....that's a pretty classic firehose sig.

image.png.86f3dcb03ef42ed65bd969aee7cb092b.png

 

image.png.053510d6cc1fc9764c8a369e302afb54.png

 

Yep, agree. Got To watch.

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1 hour ago, ORH_wxman said:

I'd def be keeping an eye on it over the interior. That is a pretty classic look for some late season fun.

Odds are still that it ends up a miserable rain event with some marginal wet snow in the elevated interior, but you cannot rule out a much more significant impact.

 

EPS looks pretty ominous actually....that's a pretty classic firehose sig.

...

...

 

LOL ... well, we're transforming this into a 'snow or not' thing- that's fine too..

I'm more into the QPF in general.  Could be quite prolific as you ...Scott et al

But I guess as far as snow goes:  I'm thinking two things concurrently on that and not sure which way to go.  

The first being, my experience in spring marginality is that the models will tend to error crucial .5C too warm because they don't really resolve the sub-synoptic dynamic dimensions that take place inside the cyclonic machinery... not from the mid range. In fact, sometimes it event takes now-casting to flip cat-paw deals into  parachutes. This is sort of October 2009 slush NFL game at Gillette as an example.  There are also feed-backs because of terrain, featuresthat are not resolved nearly that well even in the super star Euro cluster... The spine of Worcester Hills can exacerbate lift and that dynamically cools the column below the seed level and that helps draw the aggregates to the tree canopies up there... and then that starts modulating via conduction and weird micro phenomenon - ... it's not doing all this stuff over a flat curved planetary surface.  ...

I mean, summing all that together is usually going to offset the curtain heights of a CCB more so than present day modeling technology, which by virtue of limitation to do so ...smooths those thing into blindness - cooler tendencies happen. 

That said, the other aspect that I can't ignore is that our "flop direction" appears to have been ruined by CC frankly.  We used to depend upon the above spectrum of complexity to ensure a blue-green ptype chart in April ended up cake at 32 -34 F ... but it seems in the last 10 years ... more and more those are just ending up blats on windshields.  Nature does not like exact numbers - it happens...but storms typically pass through cat-paw 33 on route to some other state rather than stay at that razor's edge - that's why for the euphemism 'flop direction'

It "could" actually be just better modeling physics altogether ...

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2 hours ago, Typhoon Tip said:

Regardless of any other impacts ... whatever happens between 96 and 132 hours is likely to over-perform QPF-wise.

More advance concepts: East wind anomalies extend very deep in the atmosphere, and though this system does not fan/evacuated due to accelerating entrance jets ...it has a vertically stacked easterly jet that extends from 850 mb to and over the 300 mb of tropospheric depth - that enitre slab of saturable atmosphere rips westward for 30 straight hours, into and **while** the core heights drop an additional 6 to 10 dm... due to dynamic feed-backs. That means there is a steady ratio of instability and that much mass transport into that bucket space will end up in the buckets on the ground to put it nicely.  Terrain enhancing as a factor maximizes ... Local studies perform very proficiently in that synoptic evolution. Eastern Berks rise, the Worcester Hills/Monadnocks into the lower Whtie's due very well.

 

Yes sir on the East wind. 6Z EPS 

eps_u850_anom_eastcoastus_108.png

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21 minutes ago, Ginx snewx said:

Yes sir on the East wind. 6Z EPS 

eps_u850_anom_eastcoastus_108.png

Yeah... if there were ever a scenario that screams 'don't be a QPF queen' ... that's g-damn mo'f'n one of them right there. 

It's like the euphemism I like, 'correction vector' - I don't believe the 'uncertainty aspects' favor a lesser result.  Parametrics as modeled ( 00z suite) are in fact suggesting the opposite to put it nicely.

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Most model guidance is cooling the column pretty quickly over the interior, but whether or not it becomes a prolifc snow maker will be so dependent on exactly how that ULL tracks underneath SNE. The orientation matters....if the ULL is more elongated E-W, that is probably good for snow getting into more regions. But having it more circular or elongated N-S then it would be less favorable for snow in SNE...you'd prob see more snow out in NY State and maybe VT on that type of setup.

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