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December Medium/Long Range Discussion


yoda
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8 hours ago, hazwoper said:

Seems strange to see a low off VA beach end up riding straight up the Hudson Valley, no?

Just looking at the GFS, the trough amplifies and goes negative pretty early. That general idea would be problematic for the lowlands. Interior  elevated areas could do well as long as it doesn't track too far inland. Still about  a week out, so plenty to be resolved.

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Still learning and seeing how this cluster  tool really performs. Also this post is more so geared across the pond. But looking at the forecast versus previous forecasts it appears the intense blocking forecasted near Greenland has shifted. I am interested in the  EPS and GEFS runs this afternoon to see whether the always elusive Greenland blocking for fantasy land is starting to wash out and or shift more East.  

 

  

 

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3 minutes ago, frd said:

 

Still learning and seeing how this cluster  tool really performs. Also this post is more so geared across the pond. But looking at the forecast versus previous forecasts it appears the intense blocking forecasted near Greenland has shifted. I am interested in the  EPS and GEFS runs this afternoon to see whether the always elusive Greenland blocking for fantasy land is starting to wash out and or shift more East.  

 

  

 

?? The Greenland block is already developing right now as of this moment. This isn't a fantasy like it was last year. Not sure what the point of that tweet is.

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38 minutes ago, JakkelWx said:

?? The Greenland block is already developing right now as of this moment. This isn't a fantasy like it was last year. Not sure what the point of that tweet is.

It's always difficult to predict how long it will persist.

I like seeing the core of the +height anomalies shift further sw later in the ensemble runs, more  towards the Davis Strait and Baffin. That's the sweet spot for the MA. Initially it looks to be focused over the Northern half of Greenland.

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5 minutes ago, losetoa6 said:

6z Eps more impressive with the day 6/7 threat . Stronger with hp to the north . A bit better confluence to the ne .

Yeah.  Both the 0z and 6z aren't impressive at all with the Monday deal but tons a good solutions for Thursday. 

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2 minutes ago, losetoa6 said:

6z Eps more impressive with the day 6/7 threat . Stronger with hp to the north . A bit better confluence to the ne .

The confluence/convergence up there is something to keep an eye on in future runs. That 50-50 low is moving pretty quick on the latest GFS runs as the trough digs and heights build in front. Surface HP is on the move further NE as a result. It might help if the developing block was further along, or a bit more expansive, to hold that low in position longer.

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9 minutes ago, losetoa6 said:

Monday is no doubt a thread the needle and favors n+w if it materializes with so little cold air around but I'm not ready to give up on a system 100 hours out . My gut says it ends up too amped for anyone .

Agreed.  EPS not enthusiastic about Monday but can’t write it off yet...

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Monday would have to thread a needle. Thermals will be a problem.  The spacing between systems and the angle of the front is problematic. If the front clears the storm likely stays south. If it doesn’t it’s warm. Very narrow window for frozen. Not impossible but unlikely imo. 
The threat after that though is looking better across all guidance and might be our first real good opportunity.  Plenty of hits in all 3 ensembles. More importantly the idea is supported by the major teleconnections  

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Just now, psuhoffman said:

Monday would have to thread a needle. Thermals will be a problem.  The spacing between systems and the angle of the front is problematic. If the front clears the storm likely stays south. If it doesn’t it’s warm. Very narrow window for frozen. Not impossible but unlikely imo. 
The threat after that though is looking better across all guidance and might be our first real good opportunity.  Plenty of hits in all 3 ensembles. More importantly the idea is supported by the major teleconnections  

Important to remember that the Monday and Wednesday/Thursday storm are going to be linked. Have to see how Monday goes and how it preconditions the atmosphere.  Definitely agree that Monday is a needle threader. 

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6z gfs is very similar to last night's ICON with the midweek storm. They both jump to the coast around the mouth of the bay. With a decent cold air mass that would work out here in the Shenandoah Valley. CAD is showing up on the models. But it isn't really that cold. Verbatim it is still a thump to dryslot. But I would feel better with a stronger hp over the top. Still tons of time left though.

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