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Jan 11-12 Model/Forecasting Discussion


Ji

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I think the bigger red flag is the ensembles all being further west. Call me a weenie, but the GFS is now on the weak and east extreme of the guidance envelope. Do you trust it in that position?

it's been consistent enough and close enough to the euro that i dont care terribly much about the ensembles right now. people love the ens mean but it leads astray at times imo especially if there are divergent solutions within it. but i havent really looked at indiv members recently. unfortunately i think the gfs still makes a lot of sense even if this went too far the other way.

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The Euro ensemble mean is clearly west of the operational. Variance is getting smaller. It's not a fan of the Miller B scenarios, but from what I can tell on the spag charts, there are quite a few members that go up the Appalachians or Susquehanna Valley. Not nearly as many OTS members this time around either. I'd call this a big win for us.

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it's been consistent enough and close enough to the euro that i dont care terribly much about the ensembles right now. people love the ens mean but it leads astray at times imo especially if there are divergent solutions within it. but i havent really looked at indiv members recently. unfortunately i think the gfs still makes a lot of sense.

They are becoming pretty clustered. Individual Euro members had some real bombs and almost all members were west of the operational. I think the Euro keeps creeping west. It was already west of the GFS at 12Z. If the GFS ensemble members keep going west, I have to think the op GFS is alone at that point. Maybe it will score a coup on a very low-impact event in that case.

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18z GFS....meh. wait till 0z runs tonight. As long as the Euro holds serve, and the Canadian doesn't go too "GFS", the ensembles looked good so not time to sink into a depression. And this little event tomorrow is not to be overlooked. A nice inch or 2 of snow, maybe 3 or 4 in some places.... and playoff football too. thumbsupsmileyanim.gif

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Sorry if map is already posted... The Euro enemble mean is really west and is trouble concerning mix for eastern VA.

To me this representation looks like a good hit for the area. Still, need a phase in the SE for us to get bombed on.... maybe the season trend can work for us here!

post-772-0-28683500-1294439362.gif

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I don't say this very often regarding models because it is said too often, but the 18Z GFS just doesn't look right. It is becoming clear the southern wave will be moving out/weakening just in time to develop a shortwave but amplified ridge ahead of the western trough. Even 18Z GFS suggests this. That is where it fooled me.

What should happen is, as the mesoscale models suggest better, is that DPVA with the northern wave will support weak forced ascent along the northern periphery which will develop an inverted trough axis. Moreover, a more amplified ridge/trough like all guidance now develops enhances mesoscale jet divergence. The backside secondary jet will begin to take over later in the period as this wave heads E, but not to the extent the 18Z GFS does with it sailing straight through the ridge axis like that. I can almost bet later GFS runs will correct and trend a tad slower, more amplified with the secondary wave, and more intense with a more impressive secondary inland circulation/inverted trough axis.

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I don't say this very often regarding models because it is said too often, but the 18Z GFS just doesn't look right. It is becoming clear the southern wave will be moving out/weakening just in time to develop a shortwave but amplified ridge ahead of the western trough. Even 18Z GFS suggests this. That is where it fooled me.

What should happen is, as the mesoscale models suggest better, is that DPVA with the northern wave will support weak forced ascent along the northern periphery which will develop an inverted trough axis. Moreover, a more amplified ridge/trough like all guidance now develops enhances mesoscale jet divergence. The backside secondary jet will begin to take over later in the period as this wave heads E, but not to the extent the 18Z GFS does with it sailing straight through the ridge axis like that. I can almost bet later GFS runs will correct and trend a tad slower, more amplified with the secondary wave, and more intense.

I don't get everything you said, but I like it.

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They are becoming pretty clustered. Individual Euro members had some real bombs and almost all members were west of the operational. I think the Euro keeps creeping west. It was already west of the GFS at 12Z. If the GFS ensemble members keep going west, I have to think the op GFS is alone at that point. Maybe it will score a coup on a very low-impact event in that case.

18z GFS is maybe too far the other way. I still have little reason to believe the best track solutions in this pattern but it could happen.

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We all do, it's a running joke. :snowman:

Don't get me wrong...sometimes it is actually warranted/valid (like when specific features of interest are sampled by raobs, which we intentionally draw much closer to in comparison with other ob types).

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I am trying to be more positive :)

In all honesty though, considering everything and the data available, the GFS op is becoming a huge outlier and is doing things that almost don't make sense. I don't believe it will manage to pull a coup and verify as is.

Over the years with regards to east coast storms...it seems to really have issues in the 90-120 Hour time range

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I am trying to be more positive :)

In all honesty though, considering everything and the data available, the GFS op is becoming a huge outlier and is doing things that almost don't make sense. I don't believe it will manage to pull a coup and verify as is.

Much easier for the unwashed brain to digest. :thumbsup:

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I don't get everything you said, but I like it.

Basically, the GFS needs to have its polarity reversed while simultaneously venting excess plasma through the secondary relays. This will allow the phase coils to fully charge the primary intake manifold within the antimatter stream, thus providing sufficient neutral power consumption across the entire EM band. Not that complicated, dude.

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