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December 26-27 Storm Threat


Baroclinic Zone

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similar to ? 12z? I think the northern energy is digging better and maybe further west.

Through 24 there didn't look to be much of a difference to be, maybe some slight differences but they were rather minute and didn't really matter much imo.

Through 30 though it's definitely a little slower with the southern s/w and is more neutral tilt than positive..

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The Euro has superior data assimilation. The guys at NCEP will tell you that as well. If you compare the 12z GFS and Euro 500mb initializations the GFS was substantially stronger with the 3 main shortwaves. The location of the 3 was identical but the vorticity was quite a bit more impressive on the Euro.

Thanks. The GFS is ALWAYS the weakest though in my experience. The RUC is always very helpful in pointing that out as is the NAM. What's great about the GFS is it usually is less prone to shifting things around because of that it seems. IE, it doesn't pick up on the finer movements of the small features. That's why I have a hard time believing this is just a data error, I have to think it's partly bad math, or that the error is being grossly overstated because NCEP was figuring something had to be wrong.

I think this run will be similar to 12Z, maybe further west.. depends on the phasing.

I meant to quote will on the RGEM. Everything including the RUC which should mostly be unaffected I think continues to ramp this up.

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Considering the spread we've been seeing we need to see more than a few sets of models and one suite of agreement before we can call this game on, and especially considering this is still 3 days out.

The EC ensembles have been remarkably consistent through all the oscillations of the OP runs on each side. So I'm leaning that way...maybe we can bring this west a bit but until we have good evidence this GFS stuff has any merit, it doesn't do much.

The RGEM coming in more like the SREF and NAM looks promising though. So maybe there's a legit west trend to follow, however, I'd really wait until 00z before calling any trend....at least IMHO.

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