Carvers Gap

You all are keeping the lights on which we appreciate greatly!!!!

I haven't talked a ton about the d10-15 today, but modeling is MUCH colder with it. The 18z GFS is frigid. Its ensemble isn't much warmer. The EPS at 12 was cold. I think the MJO juice has made it to the deterministic models and their accompanying ensembles @Daniel Boone! The juice is loose!

Like that profile pic!

I have to think the northern Plateau, SE KY, SW VA, and 1500'+ in NE TN....gonna have a decent little event from this. The cloud cover today has prevented warmer temps from rolling in..

What I see from the 12z GEPS and EPS is very cold air in Canada that keeps pinwheeling into the US old school style. And that setup is a very stable pattern unlike other cold patterns we have seen. JB noted that wave lengths tend to shorten up during phase 8 and wx models will often struggle with details and strength of cold shots. If we kind of assumed this pattern began just after Thanksgiving, it makes sense for it to last to Christmas or just after, then Jan is likely warm, followed by another cold shot. This set-up reminds me a lot of 95-96 in terms of the overall sequence(maybe not the snow). Last winter did as we'll.

The Euro, after stumbling and bumbling for 4-5 days(losing the pattern), has a reasonable transition of the MJO. I think it just keeps rotating around. The GFS/AmericanModeling has tried to loop it around and been wrong with that on multiple occasions. Does it stall? It may. To me, this looks like it will transit cold phases, go COD 3-5, exit into a strong 6, and come right back around. The GEPS and EPS looks decent in the long range. The GEFS keeps pushing back the flip. I do think we see a ridge(maybe???).

Just zooming out a bit from this event...there are a lot of potential small events in the pipeline. The 12z CMC is my "go to" at 12z. Though the 12z GFS is pretty loaded up with opportunities.

URGENT - WINTER WEATHER MESSAGE National Weather Service Morristown TN 1214 PM EST Thu Dec 4 2025 TNZ012>017-035-036-045>047-050500- /O.NEW.KMRX.WW.Y.0011.251205T0000Z-251205T1200Z/ Scott TN-Campbell-Claiborne-Hancock-Hawkins-Sullivan-Morgan- Anderson-Unicoi-Northwest Carter-Southeast Carter- Including the cities of Howard Quarter, Clinton, Smokey Junction, Sandlick, Norma, Slick Rock, Sneedville, Caryville, Mooresburg, Oak Ridge, Big South Fork National, Oneida, Kyles Ford, Bristol TN, Clairfield, Huntsville, Royal Blue, Springdale, Erwin, White Oak, Evanston, Treadway, Arthur, Kingsport, Limestone Cove, Lone Mountain, Elizabethton, High Point, Petros, Harrogate-Shawanee, Jellico, South Holston Dam, La Follette, Unicoi, Elk Valley, Fincastle, Pine Orchard, Elgin, and Hampton 1214 PM EST Thu Dec 4 2025 ...WINTER WEATHER ADVISORY IN EFFECT FROM 7 PM THIS EVENING TO 7 AM EST FRIDAY... * WHAT...Mixed wintry precipitation expected. Total snow accumulations of up to one inch, along with a light glaze of ice. * WHERE...The northern Cumberland plateau and portions of the northern Tennessee valley near the Virginia border. * WHEN...From 7 PM this evening to 7 AM EST Friday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Thursday evening and Friday morning commutes.

Once this stuff starts falling, we need a brave soul to post a thread or the "storm." It ain't gonna be me. LOL. The EB looms....

Temps in Kingsport range from 35-39F. It is a lot colder than I expected it to be.

It isn't warm out there. The current HRRR has 1-2" over TRI w/ snow still falling at the end of the run. Both the 12z GFS and Euro have light amounts as well w/ the GFS having more. The NAM is pretty meh over TRI. ***Winter Weather Advisories are posted for northern areas. MRX has seen the 12z suite.***

FWIW, that axis looks about right w/ TRI maybe being a sloppy mess.

With the axis of this narrow strip of snow, small upstream changes create HUGE downstream changes. Think of it like this. When a hurricane is approaching the coast at an angle, any upstream change drastically changes the landfall location. This snow axis fluctuates with almost every run. The current 12z GFS is a good lollipop for TRI. The 14z HRRR is north of its past run and TRI is blank. I think time of day is going to be huge. I think likely that some in the forum area will see a stripe of frozen precip along the northwest boundary of this. Where? Your guess is as good as mine. But a line from Nashville to Abingdon, VA, seems about right. Anyone 30 miles to the south of that and 150 miles north of that is fair game.

Yeah, I don't trust any model at this point. Glad I don't have to put out a product tonight to the public! This is one of those which could bust either way.

Jax, looks like basically a reload. Lots of conflicting signals there. Great share.