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Potential 1/17-1/18 threat


BullCityWx

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Rgem is definitely the best looking model for NE GA and upstate SC.  Shows around 1/4 inch of liquid falling by 7am Wednesday and it's still ripping at that time. It's amazing the differences in precip maxima's across all of the models. Each model seems to favor a different area. If I had to bet right now I would say best odds at the maxima would be in a triangle from Spartanburg to Charlotte to Hickory.

rgem_apcpn_seus_48.png

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5 minutes ago, mackerel_sky said:

I need to have the GFS come onboard soon, before I can go all in!

JC snow meter is very low (3). This is a good thing. Usually a bust when it's above a 5 this far out. Maybe the firehouse cutoff as the system moves over the mountains will allow cold are to filter in before the precip..? 

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Just now, griteater said:

Interesting that the NAM wants to go with a strengthened band just east of the mtns, then weakening as it goes into E NC, while the GFS is the opposite as it is weaker just east of the mtns and has more precip in E NC

I like the idea of a decent band rolling through for both areas.

IMO the setup at 5H would favor the band weakening as it crosses the mountains and then firing back up like the GFS as the vort begins to close off. If the amped RGEM idea is right then I could definitely see an intense band rolling through the entire area.

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I wouldn't be too worried in the lee, yet, given other guidance and plus I have seen the GFS struggle with qpf amounts just east of the blue ridge all winter. Something appears off after some recent updates I think. So as the GFS continues to catch up and increase amounts near Winston, I believe it always be too low near the foothills with this model. 

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31 minutes ago, burgertime said:

Found the Feb 2013 event I was thinking of. This is what it looked like at 5h on the RAP just before the event vs. NAM. That one dropped around 3 - 4 inches in places in around 2 - 3 hours. We actually had heavy snow warnings during it. 

<img>tutWLra.gif

 

zebkUXc.png

Yo Burger, hope you are doing well!  It's a decent analog, was looking at GSP's write-up on it yesterday.  I'd say this one may not be quite as dynamic though.  Check out the 540 contour on the Feb '13 storm, it's down in central Bama, whereas with this week's storm, it is on the NC/VA line.  So, it's not as strong aloft and it's a little more positive tilt.  The NAM and RGEM do show nice precip breaking out as it rolls off the mountains though

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1 minute ago, snowlover91 said:

IMO the setup at 5H would favor the band weakening as it crosses the mountains and then firing back up like the GFS as the vort begins to close off. If the amped RGEM idea is right then I could definitely see an intense band rolling through the entire area.

The hi res models are keying in on enhancement from the lee-side trough... this fades away as the system swings east, and is why it's definitely possible to see a maxima in the lee-side and then have the band dry out as it approaches eastern-NC.  It's happened several times before in this type of setup.

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German looks sweet, but looks weird/inaccurate. Never see uniform amounts in south-western NC like that in most storms like this and around north Georgia into the Upstate. That would of course impact regions further north-east too with lesser amounts. Will save for future reference of precip spread verification. 

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You all started the thread without me. :( 

1 minute ago, burrel2 said:

The hi res models are keying in on enhancement from the lee-side trough... this fades away as the system swings east, and is why it's definitely possible to see a maxima in the lee-side and then have the band dry out as it approaches eastern-NC.  It's happened several times before in this type of setup.

Sounds depressing. Lol. 

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Just now, burrel2 said:

The hi res models are keying in on enhancement from the lee-side trough... this fades away as the system swings east, and is why it's definitely possible to see a maxima in the lee-side and then have the band dry out as it approaches eastern-NC.  It's happened several times before in this type of setup.

Yeah that's why I said if the amped up RGEM is right the foothills could see more qpf than the GFS shows. It all depends on how the cutoff evolves, where and how far north/south it sets up. There will likely be a meso-low that develops in the foothills that could mess with thermals too and how that evolves could enhance qpf for some and cause major mixing for others.

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FWIW, I wouldn't be surprised to see a a precip maximum wind up traveling from say Spartanburg to Myrtle beach with this setup.  I can remember a similar event where a you could see the low-level swirl on radar generated from the lee side backing of winds and it traveled all the way to myrtle beach, and no models showed that evolution or that far-south precip max leading up to the event.

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We currently have a lot of good trends.  However, now is a really good time to step back and look at what could go wrong.  Since I'm in the triad just east of the mountains, I'll kick it off for this area.  Feel free to add more areas/regions.

NC Piedmont - most all models are showing between 1-5" of snow with the most being north and around the Triad area.  Of all winter setups for this region, the least reliable are those relying on anything that comes over the mountains paired with redevelopment east of the mountains.  Most times, the moisture coming over the mountains will dry up, so I would assume that's a zero for the band making it over the mountains.  As for redevelopment, it does happen, but is the most difficult to forecast and most often busts on the wrong side.  I'm hopeful for this one but still pretty skeptical at anything over an inch and really expecting more of a heavy dusting. 

TW

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