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Pattern Discussion 12/15 and beyond


ORH_wxman

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While I respect DT's opinion, how many times do we go through this where we say a system cant cut into the lakes because an NAO block is in place? His philosophy is that the models are breaking down the -NAO rex block that forms around days 4-5 too quickly, and the day after Christmas storm has to track further east than models show. I think further east is reasonable, but not one to produce a major east coast snow which he is stating. I could role with an Ohio valley tracker, redevelopment over maryland/NJ type deal.

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I was just curious so I looked and once again I was honestly surprised, but after 2 years I really should not have been.

Sultginxys 2 day winter assault (lol at those that punted december) ice~a~thon

bos +3 +7 +4.1 dec

bdl+3 +3 +3.4 dec

pvd+1 +7 +4.5 dec

orh-1 +2 +5.4 dec

monster departures today

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While I respect DT's opinion, how many times do we go through this where we say a system cant cut into the lakes because an NAO block is in place? His philosophy is that the models are breaking down the -NAO rex block that forms around days 4-5 too quickly, and the day after Christmas storm has to track further east than models show. I think further east is reasonable, but not one to produce a major east coast snow which he is stating. I could role with an Ohio valley tracker, redevelopment over maryland/NJ type deal.

Works for me.

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The block weakens and there isn't a huge reason for it to be all snow. I do see signs it could be a SWFE deal so let's hope, I'm just not sold on that 100%.

The models often break down blocks too quickly. But I'm concerned with how quickly the 50/50 low or the big ULL slides out to east. That may allow it come pretty far west, before a secondary low takes over. The 0z Euro ensemble and 6z GEFS, suggest this now. The best snow setups with a -PNA, seem to be with a vortex remaining underneath the -NAO block longer.

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The models often break down blocks too quickly. But I'm concerned with how quickly the 50/50 low or the big ULL slides out to east. That may allow it come pretty far west, before a secondary low takes over. The 0z Euro ensemble and 6z GEFS, suggest this now. The best snow setups with a -PNA, seem to be with a vortex remaining underneath the -NAO block longer.

Right you made my point. Part of a block is confluence which is minimal. It still could be a SWFE for us, but there is a lot if time left for it to look worse.

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While I respect DT's opinion, how many times do we go through this where we say a system cant cut into the lakes because an NAO block is in place? His philosophy is that the models are breaking down the -NAO rex block that forms around days 4-5 too quickly, and the day after Christmas storm has to track further east than models show. I think further east is reasonable, but not one to produce a major east coast snow which he is stating. I could role with an Ohio valley tracker, redevelopment over maryland/NJ type deal.

What you have here is above normal heights to begin with across Canada so that when you get some ridge from a Mid Latitude Wave, the anomaly charts appear to look amazing. This is a case where you actually have to look at the means and the anomalies. If you just look at the h5 anomalies, you'd think 2009 or 2010 was on the way or something. In reality, the Arctic Heights took a hike back to Asia and we are left with generally above normal heights throughout Canada, so any small ridge will appear like a huge block on anomaly charts.

The thing about "models not realizing the strength of the 50-50 low and block" is usually when there is a strong cold air source / suppressive high / polar vortex. The situation after Christmas is another hybrid, bootleg scenario that could possibly benefit the interior and portions of New England. Even we could see a snow to rain but I'm about 50, 50 myself on that one. This is NOT a classic 50-50 low / -NAO setup; otherwise, I'd be on board with DT.

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If you get wintry weather before the EPO dislodges cold air for us, consider it a gift. I've already punted December down this way a long time ago, so I'm not too concerned. Really, I'm pleasantly surprised by the lack of a torch being modeled, given the circumstances.

If the PV did this last year, it would have meant 70s. lol

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