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February 19-20 Major Winter Storm Threat


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My professor’s favorite saying is the devil is in the details. With these weak strung out systems, it is going to come down to poorly modeled mesoscale features which is ironically what the mesoscale models are supposed to iron out . This is like a car wreck I can’t look away from!

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On 2/17/2025 at 10:24 PM, HKY_WX said:

My thoughts:

AVL to HKY Corridor: T to 2

CLT: 1 to 2

GSO: 2 to 3

RDU: 3 to 5

Rocky Mount to VAB: 4 to 8 (likely more in spots)

 

 

I'll stick to the above. I think there's a bit of overpanic tonight. The globals have been pretty steady today while the high res models struggle with the gulf convective issues. 

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For the record to help evaluate model performance, 0Z UKMET for RDU dropped to 0.9” snow on 10:1 of qpf. 100% snow.

Last runs starting with 0Z 2/17 run:

1.9”, 0.6”, 2.1”, 1.5”, 1.4”, 2.2”, 0.9”. So, UK has been drier than most models since the 0Z 2/17 run.

 Before that, UK was among the snowier models with 5.5” on 12Z 2/16 run. These are Pivotal 10:1 snow amounts. In these cases they were usable because the precip has been almost all snow since the 12Z 2/16 run.

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0Z Euro Kuchera: up slightly at RDU to 2.6” from 2.4”/2.3” prior two runs:IMG_3110.thumb.png.e234dfaca29f719ccd06995fb167b794.png

RDU qpf 0.29” (nearly) all falling as snow; slightly higher than prior 4 runs (they were 0.25-0.26”):

IMG_3112.thumb.png.a99f701a92962ba3d319a210a5b385d1.png

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6 minutes ago, ForsythWx said:

Both 12k and 3k NAM trended better for triad and WNC. Dry slot has been filled somewhat 

3K 6Z NAM 850 0C line is much further north than the 0Z. Now it has significant sleet in RDU!

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49 minutes ago, CentralNC said:

Based on radar trends I still think Raleigh area looks pretty good.  In my neck of the woods, not so much.

Models looked abysmal for the triad overnight, but it's encouraging to see the hires models tend towards throwing more moisture back west with WAA as frontogenesis pushes moisture NW

hrrr_ref_frzn_neus_8.png

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20 minutes ago, olafminesaw said:

First potential flakes moving off the foothills. Could produce light snow/flurries, but no mechanism to develop meaningful precip atm

Screenshot_2025-02-19-07-24-27-826.jpg

I am under that right now and I have yet to see the first flake.

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9 minutes ago, PackGrad05 said:

HRRR trends have definitely been to increase the western expanse of the precipitation and to build it back in for a slightly longer duration event.

Good thing, because everyone is already posting on FB about moisture transport from the gulf being robbed.

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