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December 26-27 Storm Threat


Baroclinic Zone

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I thought the NAM was slightly more impressive with the phase... It seems kind of chintzy with qpf on the west side relative to what the GFS would show with that track probably. But .25" here is 1000% more than the 12Z run had.

Could it still be the bad data?

No that ship has sailed.

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Oh yeah agreed. I could see the GFS style stall off Long Island... or something like the NAM shows with it plowing northeast.

I still think this run is suspect. I really can't go against the UK/GGEM/Euro (op and ensemble) consensus

Agreed, talking to a few people on facebook who are all excited but I told them until I see some support from the global models I'm taking this with caution...this certainly has led me to keep all options fully open but as of now I'll continue to side with the globals...tonight's global runs are going to be HUGE.

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I wobbled like the EC ensembles a little bit, just didn't want to see a miss east but said I called the NCEP bluff although I know it wasn't anything of that sort. They believed what they said and in reality we are all still going to want to see one non-home grown model delivering a big hit that isn't the JMA.

I agree,the post mortem either way will be interesting. One trend I've always noticed in american model guidance is that even modest changes tend NOT to have the effect one would think. Look at tonight, the s/w moved hundreds of miles from the 18z and yet the MSLP is really not much different. So maybe NCEP was right in noting errors - it appears at 0z they had valid concerns, the model did initialize with some timing/strength differences, but it appears they were kind of irrelevant to the physics of the model. I said it on the other thread as someone who will watch a storm drop a dusting on ACK because I find it entertaining....most of the time the changes we saw in tonights 0z init is the difference between 6" and 12", not 6" and sunshine.

I agree with you. I would also like to see other model support. Hopefully, 0z will deliver support that backs up the bigger storm idea. No matter how this plays out, it will be an incredible chapter in the history of modeling.

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Well I hope you finally get a big dump of snow :) For me its the difference between flurries and advisory level snows... But still lots of fun to watch evolve. :)

It would certainly be nice! It's certainly a challenging forecast for CT...Global models give us nothing at all while American models give us basically warning criteria. Tough, tough.

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B

I think this is the best solution to keep the Cape all snow and giving us warning criteria. Further east, we miss the qpf (though we might make up lower qpf even topogrpahical enahncement and hpefully fluff factor). Further west, they would be having some mixing issues.

Will's comment suggests that this might be as far west as it can get (at least based on the NAM scenario, I imagine). If that's the case, we best hope it holds!

But we don't care if they mix. Oh, I mean that would be terrible.

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I just wish this was the Euro doing this and not the NAM :axe:

I'm leaning 75% to the NAM/GFS at this point. I hate going against the Euro but most of the differences between the 12z runs were apparent by 12 hours into the run. The 18z and 00z runs thus far have confirmed the GFS's 12hr forecast and the 18z NAM.

In fact, I think most of the differences were apparent at initialization at 12z. I think HPC actually was onto something.. the GFS WAS initializing very different from the other models and this was leading to the extreme solution. However, I think what they were wrong about, is that the GFS was initializing incorrectly. It was actually closer (IMO) than the other models.. the 18z NAM picked up on it and corrected, and is now holding serve.

NAM/GFS might be a little extreme, but I strongly believe the Euro will come west significantly from 12z.

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I'm leaning 75% to the NAM/GFS at this point. I hate going against the Euro but most of the differences between the 12z runs were apparent by 12 hours into the run. The 18z and 00z runs thus far have confirmed the GFS's 12hr forecast and the 18z NAM.

In fact, I think most of the differences were apparent at initialization at 12z. I think HPC actually was onto something.. the GFS WAS initializing very different from the other models and this was leading to the extreme solution. However, I think what they were wrong about, is that the GFS was initializing incorrectly. It was actually closer (IMO) than the other models.. the 18z NAM picked up on it and corrected, and is now holding serve.

NAM/GFS might be a little extreme, but I strongly believe the Euro will come west significantly from 12z.

You might be right... but GGEM/UK/Euro is a hard combination to ignore. I don't really know.

All I know is I'm going home in 90 minutes and cracking open a big bottle of wine.

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