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Significant Ocean Storm March 5-7 2013 Discussion Part II


earthlight

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Can someone with knowledge provide some analysis of why the GFS changed course so drastically, i.e. what changed from its previous runs that would lead to this solution rather than the solutions it had been showing for multiple runs?

It seems like as the low gets into southeast VA, it goes through a weird transition phase.  THe law occludes, gets vertically stacked, then redevelops east, and as that whole process is going on the vvs and ccb just fall apart.  This kills its foreward momentum and by the time it gets fired up again its shifted out east.  I could see how/why this could happen. 

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Full phase with that northern S/W this run but occurs late so that it hits DC then skips over us and hits Boston as the phase tugs the low back NW at the last minute

 

most of the models have clearly been showing this for 2 days (as I pointed out yesterday AM)

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DT should be claiming victory at any moment if he hasn't done so already lol.

He was blatantly denying that models were trending north. This isn't a win for him.

 

I will say, the SE trend with the initial 500mb low/energy is becoming concerning. If the Euro shows a similar shift SE it might almost be time to call it done.

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No they haven't, the Euro just about has never wavered once.

Um no, the EURO came hundreds of miles north from 0z monday to 0z tuesday, took BOS from nothing to 2"+, and here from nothing to .5" or so. Not a huge shift for here, but for BOS it went from nothing to a blizzard.

 

-skisheep

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they have been the most consistent ... they arent going to be wrong with every storm ...

I think the models could be better but it is really our interpretations of what they are saying that is most deficient. We could see all along that there was no consensus for a blockbuster storm here, and we can still see that. That does not mean there won't be one, but it certainly means it's unlikely. On the other hand, we can see that we may yet get a significant event but we just do not know how significant. Should we be able to know how significant at this juncture? Probably. But when there are so many vorts and shortwaves playing into the outcome, it is going to be more challenging and we should be cautious in not going off of the deep end. It has been obvious that there would be some rain mixing in with this unless there was terrific intensity and it now appears that there will be less intensity or a shorter duration of intensity. So, the lower amounts of wet snow--a dusting to 3" or in some areas 2-5/3-6" wet snow primarily on grassy surfaces is still a good bet, but not a certainty!

WX/PT

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Euro more than wavered. For like 10 runs in a row it had either no precip or less than 0.1. Then all of a sudden the next two runs increase precip 5-10 times how is that NOT wavering? This is regardless of the final solution, bc in the end the euro could still be right initially with its idea of little precip up here, but it absolutely 100% wavered. And this isn't subjective it's a fact

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He was blatantly denying that models were trending north. This isn't a win for him.

 

I will say, the SE trend with the initial 500mb low/energy is becoming concerning. If the Euro shows a similar shift SE it might almost be time to call it done.

No - he said the euro didnt really trend north...he was wrong about to some extent, but he is going to be right about the eventual outcome...without the Euro showing a "real" storm this was never a serious threat...

now we just gotta hope it stays far enough away to spare the shoreline and keep the rain away.

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We have the night crew telling everybody we are going to get Crushed and the day crew telling its going out to sea. You got to laugh thank God its only the weather and only thing you can do is watch.

Those of us that are on these boards all season long realize that what one model run gives, another can take away. Yesterday the models trended very favorably. Overnight things were still looking good but the writing was on the wall so to speak as the GFS began ticking southeast. I still think things will correct back northwest some. This is all just noise and the final solution is probably very similar to the SREF which would make most of us very happy.

 

Waiting on the GEFS.

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Euro more than wavered. What model data are you guys looking at. For like 10 runs in a row it had either no precip of less than 0.1. Then all of a sudden the next two runs increase precip 5-10 times how is that NOT wavering? This is regardless of the final solution, bc in the end the euro could still be right initially with its idea of little precip up here, but it absolutely 100% wavered. And this isn't subjective it's a fact

The mistake is buying what each model is saying literally as "the one". The models should be used as guidance to a forecast, not the forecast itself.

WX/PT

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No - he said the euro didnt really trend north...he was wrong about to some extent, but he is going to be right about the eventual outcome...without the Euro showing a "real" storm this was never a serious threat...

now we just gotta hope it stays far enough away to spare the shoreline and keep the rain away.

Ace we haven't seen the 12z solution yet and 0z had around 6incjes for NYC so I think we should wait before we start making proclamations like that
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Those of us that are on these boards all season long realize that what one model run gives, another can take away. Yesterday the models trended very favorably. Overnight things were still looking good but the writing was on the wall so to speak as the GFS began ticking southeast. I still think things will correct back northwest some. This is all just noise and the final solution is probably very similar to the SREF which would make most of us very happy.

 

Waiting on the GEFS.

the SREF? That was more amped than the GFS ever was, even more than the NAM now is. That to me is the last model that I'm basing a forecast on in light of the trends today, and I think it has little to no hope of verifying.

 

-skisheep

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the SREF? That was more amped than the GFS ever was, even more than the NAM now is. That to me is the last model that I'm basing a forecast on in light of the trends today, and I think it has little to no hope of verifying.

 

-skisheep

In times like these you go with consistency. The NAM and the SREF's haven't backed off in days. You want to go ahead and go with the GFS camp go right ahead, but I wouldn't be putting all my eggs in the basket that has changed so dramatically in the last 24 hours when I have other models that have been consistent.

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Euro more than wavered. For like 10 runs in a row it had either no precip or less than 0.1. Then all of a sudden the next two runs increase precip 5-10 times how is that NOT wavering? This is regardless of the final solution, bc in the end the euro could still be right initially with its idea of little precip up here, but it absolutely 100% wavered. And this isn't subjective it's a fact

 

100pct.

 

However, one is a high impact waver and the Euro is a low impact waver. What's worse a model showing 2"qpf and then it cuts back to less than .5" or a model going from from .1 to .5, and the increases have been slow and steady? There is no question which is the better model, yesterday,last year, last decade, today and forever...

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No - he said the euro didnt really trend north...he was wrong about to some extent, but he is going to be right about the eventual outcome...without the Euro showing a "real" storm this was never a serious threat...

now we just gotta hope it stays far enough away to spare the shoreline and keep the rain away.

I think the GFS is overcorrecting to an extent but this scenario was always worrisome for us. At least the model looks like it's cooling down so we have a shot at salvaging what we can as snow. But with light rates it might not accumulate. That run verbatim was just awful for most of us. It somehow manages to be developed too early and in true winter 12-13 fashion, develop too late!!

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