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January Mid/long Range Winter Discussion


Wow

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Jan_8_AO.gif

 

 

 

Just about to say that, Grit.  Strong blocking usually remains longer than forecast.

 

 

Interesting...it's still negative, but probably just see saws like you posted after day 10.  Still a great look on the GEFS, another legit threat on Jan 21st.

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12z GFS parallel.. here is the setup at 216 hrs.  This is exactly what you want to see for a major snowstorm.  50/50 low over SE Canada lifting to allow HP to nose in, higher hts over western/central Canada with high pressure all over top, and a stout STJ wave that has dug deep into TX/Mexico.

 

 lvbc9op.png

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It does a little too offshore to hit DC but that's 240+ hrs out.  Regardless, it's a killer setup for all.

 

Most of our best storms ( for central and eastern NC anyways) dont go up the coast usually.....usually if DC is in the game I am out of it :(

 

The OP run was awesome for us in the east but obviously not going to happen...actually I would love to see that trend 50 miles west lol

 

 

 

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The key here is to maintain a +PNA ridge and linking up with the west NAO block to build a large HP over central Canada and sends it south.  Cold air is now in place... that's a huge step toward a big storm.  Last step is to keep the STJ wave strong enough.. it's a strong El Nino year - not worried about that one.

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The Euro says the mountains shred it. Doesn't have any wintry precip East of the mountains.

Not the case, the mountains don't "shred" it the energy is just too far north for NC. If it digs more due to a sharper PNA ridge then it could bring some light snow into NC. Something to watch in the short term.

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The key here is to maintain a +PNA ridge and linking up with the west NAO block to build a large HP over central Canada and sends it south.  Cold air is now in place... that's a huge step toward a big storm.  Last step is to keep the STJ wave strong enough.. it's a strong El Nino year - not worried about that one.

 

BTW, the Euro out to 144 hrs is doing just that.

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At 192, cold air moving in behind the Fri system.  Gulf low forming with a PV lobe dropping through the C US

 

That PV lobe is the wild card.  Trying to pop a gulf low.. may be a bit too strong to go neutral tilt but boy is it cold enough.

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it's not gonna cut but it might get squashed.

 

it does on this run.  The PV lobe is too strong and shears it out @216.

 

Best case is that the lobe is not there at all.  About 5 days out, all models show the PV stretching in attempt to split, some do and some reabsorb it and never fully splits.

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Yeah, it ends up squashed.  This will be one of those catch phrase things, but it looks a lot like Pack's fav storm Jan 2, 2002 with the PV dropping down through C US with gulf low....that one's been on the CPC analog lists....along with late Jan 1966, a great period.

LOL...drops PV deep into US. A little different than the GFS/GEFS/CMC-ens

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