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Christmas Storm III


Cold Rain

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I know it's 18z, but this has been my BIGGEST concern ever since the UKIE went way south yesterday. It confirms it's still my biggest concern.

well it couldve sent into the OV and we know that would be worse, Id rather hope for a north trend on the gfs than a south one. cuba seems a little extreme anyway, but it is the 18z, so....

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I commented and he replied in like 2 minutes.

ZB… The moisture convergence fields on the 12Z ECMWF along with upper divergence are not nearly impressive as they were 24 hours ago. The ECMWF output from 12Z does not support a major snow storm for North Alabama…

I don't know.... As has been pointed out this was a near perfect solution, and we have expect some degradation, but going toward the Gfs would be disintergration. I guess we'll have to wait until 1am or so to find out if he's right. I know climo agrees with him. T

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I commented and he replied in like 2 minutes.

ZB… The moisture convergence fields on the 12Z ECMWF along with upper divergence are not nearly impressive as they were 24 hours ago. The ECMWF output from 12Z does not support a major snow storm for North Alabama…

Ok. So the fact that it went from a stronger system over N. AL to a weaker system for N. AL means the ECMWF is "trending" toward the GFS? What about the track? The track is not trending toward the GFS. You can't just find one attribute that is moving toward the model of your choice and say the whole solution is trending that way. He's really only focused on N. AL though, so don't be too hard on him.

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54 looks a touch SW of the 18Z guidance...

The big feature to watch is the northern stream interaction, which start the phase much earlier and keep the southern stream s/w further north and weaker. There was strong interaction by 72 hours on the 12z gfs... but thus far it seems that the northern stream s/w hasn't dug down as much as it did on the 12z run so we might see a slightly better solution.

Edit: Sorry it took me a while to make the .gif. The solution still goes to crap, but its making baby steps towards the Euro and Ukmet.

10yntw4.gif

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Ok. So the fact that it went from a stronger system over N. AL to a weaker system for N. AL means the ECMWF is "trending" toward the GFS? What about the track? The track is not trending toward the GFS. You can't just find one attribute that is moving toward the model of your choice and say the whole solution is trending that way. He's really only focused on N. AL though, so don't be too hard on him.

Yeah, but with GA being so close to AL, it worries me that he doesn't think this will be a big deal.

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Yeah, it looks like the Euro isn't painting a ton of QPF in N AL...but still enough for accumulating snow, right?

In a scenario where Atl gets 2 to 4 you know Ala. gets some too. I can't think of too many times I've gotten sticking snow and Ala didn't. I didn't even think that was possible, unless it was some strange event where Joe sends snow down on a cad. T

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I commented and he replied in like 2 minutes.

ZB… The moisture convergence fields on the 12Z ECMWF along with upper divergence are not nearly impressive as they were 24 hours ago. The ECMWF output from 12Z does not support a major snow storm for North Alabama…

He's right about NORTH alabama. It's one of the few places the euro doesn't have much precip. So I don't think he is talking about anywhere else. Georgia, on the euro, does far far better than alabama.

doubtful. GFS just weakens the s/w and lets the northern jet take over.

It would be nice if it would finally come aboard. Reminds me of last winter when the gfs kept hanging on to a very far south and dry solution for days, while the other models (especially the canadian) were being consistent in showing a much further north system. We can only hope this is a case of the gfs being stubborn and not having a clue.

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I know it's 18z, but this has been my BIGGEST concern ever since the UKIE went way south yesterday. It confirms it's still my biggest concern.

I thought it was good to see HPC say that the UKMet was an outlier - "AFTER DISCOUNTING THE 12Z UKMET DUE TO ITS OUTLIER DEPICTIONS IN MULTIPLE AREAS..."

I think we are sitting in a great position with respect to storm track and our big bugaboo, cold temperatures. My biggest concern would be the phase not occuring properly and we end up with a light to moderate event instead of a moderate to heavy event.

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He's right about NORTH alabama. It's one of the few places the euro doesn't have much precip. So I don't think he is talking about anywhere else. Georgia, on the euro, does far far better than alabama.

It would be nice if it would finally come aboard. Reminds me of last winter when the gfs kept hanging on to a very far south and dry solution for days, while the other models (especially the canadian) were being consistent in showing a much further north system. We can only hope this is a case of the gfs being stubborn and not having a clue.

What part of GA does "far" better than AL ? James Spann covers all of Central AL including areas near Atlanta ( right on the GA border).

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