Carvers Gap

The 12z GFS has the 0z Euro Arctic outbreak over much of the eastern half of the United States.

Light dusting here this morning. Congratulations to @1234snowon the snow! I thought I would share the 0z Euro from overnight. This is a major feature on the map, and must be worked out before we know sensible weather on the ground. That is a legit cold air mass. Both the GFS and Euro have below zero and single digit temps descending into the forum area w/ the amplification just after the 25th. Is this a real feature? No idea. Modeling has done a good job of spotting cold fronts recently after struggling earlier this month. However, they have tended to over-do the southward extension of the cold and the intensity. If this were to verify, that is a major ice setup in the eastern Valley. Decent signal for yet another strong amplification around Jan 27-28.

The 18z GFS is on winter storm #3 at 288.

The 18z GFS is just one big over-running event. Can the cold get here in the amounts we need? Can the STJ show up as modeled?

Halftime. I posted this on June 8th in the winter spec thread...I still think many areas end up w/ normal snowfall FWIW.....my eastern valley AN snowfall looks in jeopardy for sure. Snow is ALWAYS a crapshoot. Some good takes and some HOT takes!!!! I will work on some analogs packages. This is tricky this year as we were more La Nina last winter, trended back to neutral, and may trend weakly negative again. For now and subject to change... Temps... Dec: BN Jan: N Feb: AN Precip... All months normal to slightly BN IMHO...but w/ a chance for slightly AN if you like the CANSIPS. Snow... AN eastern valley w/ an early start normal everywhere else w/ snow a bit later in middle and west (but honestly might be similar to what you got this winter)

The 18z GFS is definitely running w/ the over-running idea. Unsurprisingly it has trended slightly north, BUT...this looks like the winters of the past decade where the cold stalls either at the Plateau or Apps. I bet if you dig back through my winter forecast in June, you will see this scenario mentioned.

And I get that it is frustrating for some. My pet peeve is tracking a potential pattern change, and it turns into a seasonal frontal passage. Haha. I just don't see this as a "can kick". Jan 1-10 was a can kick. This weekend's system was a pretty bad model error in terms of synoptics. I do think the GFS has a tendency to (erroneously)really, really amplify features on the map at times between the d 7-15 times. I don't understand it. It wasn't like that last winter that I can recall - maybe I need to go back and check. Right now, we are fighting widespread drouth over the SE. Trying to get a moisture conveyor belt going over drought areas is like pulling teeth.

What we are looking for is an STJ wave to have a trailing hp or one over the top. It looks like the GFS held back cold on this run, and it will dump SE w/ the second system.

The second system on the 18z GFS should be good as it has a big high over the top.

Illustrative of what we have been talking about w/ the GL low....take a look at the 18z GFS. The high scoots out quicker on the 22nd. A weak slp slides in over the top, and thermals get mixed. Also, as I noted earlier....we really want that slider a bit south of us as most of those features have trended a bit warmer and further north one time - all of that normal. However, I wouldn't be surprised for this to trend colder at some point. As is on the 18z GFS...ice setup.

Got the EB mega heat island on the north end of LI and the D--tar smell from **** on the south end. I have been thankful for winter westerlies! KPT folks have extra wx "hurdles" for sure. Plus, the S Holston(KPT) is the lowest elevation in TRI I believe. I also think tailwaters (50s year round) are somewhat of an insulator to really cold or really warm temps.

Well, that adds a layer of small bit interest for me. When is the best lift if there is "best lift?"

There could always be surprises, but precip amounts are very light...and has been on modeling for several days in E TN. I have zero knowledge of Signal Mountain w/ these types of setups. I looks to me that south of I40, this is rain...but at elevation I just don't know. The MRX graphic looks about right to me.

The HRRR and 18z 3k NAM are all snow for NE TN, albeit very light amounts. The 18z RGEM is rain. When is onset for this?

My skies are clear for sure. It hasn't been warm today at all. When I went running this morning, it was 12 degrees I think...one of the top 5 coldest running mornings(this winter) for me. Yesterday was by far the worst. I made the mistake of running down on the river(you know where it is...NI).