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December 2022 Medium-Long Range Disco


WxUSAF
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4 minutes ago, WxUSAF said:

We basically want that whole area of low 500mb heights to get pulled like taffy, with one big clump moving toward Ontario and the other pinwheeling around it down the Rockies and into the Plains.  0z Euro did that some, although not to the degree the 12z GFS did.  12z euro seems to be stubbornly staying as one big wad.  

Are we saying we want the Euro to blow it's wad?

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Just now, leesburg 04 said:

Until one moves towards the other I fail to see how anyone can say either is correct at this point. In their own way the GFS and the Euro are correct as far as anyone knows

Yep. Now someone in the other forum brought up the idea of if the block could essentially be too strong (and that that's the reason the energy can't get through because it gets trapped) Thoughts, anyone?

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this is the difference between the two outcomes. everything after this is gravy

the GFS has a much more amplified vort diving out of AK... this means that it travels slower and allows the TPV to get out ahead of it, leading to the two-piece solution

the ECMWF has it much flatter, which allows it to catch up and mingle with the TPV, leading to the farther W solution with very little confluence

which one is right? there really isn't a way to tell at this point, but we will know in the next 48 hours. I'm sure that we will see some EPS members that amp this up like the GFS and some that flatten it like the ECMWF, leading to considerable spread

ezgif-4-08d4bbe7f5.thumb.gif.5b6988186bd9a3725288cfc04a5d90e0.gif

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