Dec 18/19 update:

It appears as of now that this storm will produce some wintery weather for the triangle on Saturday night, however accumulation amounts look to be on the lighter side.

HPC prefers a blend of the 00z ECMWF and the 12z GFS. The GFS wraps moisture around a weak low pressure which will be located off the southeast coast Saturday night. WRF model data shows a weak 850 low skirting the S. Carolina/N. Carolina border helping to produce precip along the deformation zone axis. GFS shows about 1/4 inch of qpf for the triangle while the WRF actually spits out close to a half an inch. Expect the precip associated with these features to occur after sun set. The timing should help in regards to boundary level conditions, but I do think some mixing will occur through the event before ending as snow. Reasoning is due to potential warming aloft with southwesterly flow ahead of the 850 low. I only looked at the GFS bufkit sounding since this is what HPC prefers.

Not to get too detailed with the timing, but at this time it appears the best chance for moderate snow associated with the deform zone for the triangle will be between 8:00 PM and 2:00 AM with a potential isothermal layer setting up due to diabatic cooling processes. That's a 6 hour window of potential snowfall with the heaviest precip falling in the middle of that time frame. Expect rain to mix in when the snow is falling relatively light and perhaps remaining all snow during heavier precip. I do think mixing will occur through the event.

Because of this I have to predict only around an inch of snow possible for the triangle on Saturday night.

Will update tonight if there are any significant changes.