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Everything posted by Holston_River_Rambler
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December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
18z Euro mighty close to making the jump across the Apps: -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
They've been pretty consistent for both our areas with a one inch mean and no members showing 0. -
Fall/Winter Banter - Football, Basketball, Snowball?
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
@BhamParker Here is a similar, but not identical set up from Dec 21, 2018. I mention it because I chased it up to 6000 feet and here is how the elevation changed the accumulations, at least as it was underway. I had to leave at about 6000 feet on Mt LeConte, I just didn't have the right gear for this: 6" in about 3 hours and a 20 mph wind gusting to 30+ But below that, here is what it looked like at about 5000-5500 feet: 4500 - 5000 feet: 2500 - 3000 feet: Trail head for Bullhead trail up Mt Leconte: I don't know if you are a hiker, but Bullhead trail is accessible to Gatlinburg and gets you up above 6000 feet. It's a heckuva hike though and this storm looks like it has a much better upslope component. Most of this came from a quick changeover from 6000 feet around 5 AM down to 3000 feet by 10 AM and them on down to the base of the mt. I think 3000 feet probably did a lot better than these pictures depict, since I had to leave early and the one I label 2500 - 3000 feet had no snow when I went up. All that accumulation was by the time I got back to that part of the trail. -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
18z GFS looks like it almost wanted to run the SLP from Macon, GA to Charlotte, NC, but randomly jumps at hour 36 back to the TN/ NC border: I guess we're just at "see what happens time" now. One thing I did notice today was that there was a stronger wedge (from obs at southerwx) and a little bit of a leeside low near Asheville: That's now transitioned to a more of a diffuse area of lower pressure and the WPC even has a couple of what I think are inverted surface troughs and a Low hanging out in the piedmont. This may play a role in how the surface low behaves too, but honestly I'm not sure: -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Yeah, their 1 -2 for Roan Mountain seemed a little low to me, but maybe they mean the town of Roan Mountain and not the 5500 - 6000 peak. Did I read earlier that you were getting a cabin near Gatlinburg @BhamParker? -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
The WRF NMM showed a similar solution at 12z: That would be as much of a run for my location as I can probably hope for. -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
18z RGEM plows the surface low right up the TN/ NC border. -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Looks like it, lol. 18z RGEM is coming in further SE. -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
18z NAM is west again, but shows some change over in Middle TN toward Monday early AM -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Check out the streamer off of Lake Michigan on the UKMET, aimed right at Frozen Head -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Here's the Ukie SLP gif. The gif jumps north at the end because the SLP drops off the SE sector view: -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Ukie also has that SLP reflection off the GA coast to pull on the Gulf low some, hopefully a good sign that a global sees that too. -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Yeah, I'm only out to 30 hours or so, and it is definitely SE some. Will post the gif when it finishes on F5 weather. -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
It's popping a low pretty far south in the Gulf 1013 mb SE of Brownsville as compared to 1012 off the coast of Corpus Christi at 0z -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
12z Ukie might be a good test for the front theory. Looks like it is already pressing it further south on this run compared to 0z. Only out to 12 hours for now. -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Maybe I answered my own question lol. Interesting to look at 10m wind on the same three mesoscale models: Nam 3k: WRF: RGEM: It does seem like there is a correlation between how far south the front makes it and how eastward the SLP moves. The WRF-ARW gets it a little further south and has the most easterly of tracks: It also gives a little more umphh to a surface low off the GA coast which tugs on the Gulf low a bit. Could be a question of how the convection impacts the SLP formation? -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Here is where it looks like the front is on the latest SPC mesoscale analysis's windbarbs: -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Good question, but I'm not sure how I could figure that out. I think it would have to be a mesoscale model. I'm looking at the RGEM and NAM and WRF on TT, but having trouble seeing it in enough detail on the simulated satellite. Here are the gifs with a fresh satellite. See what you think: 3km NAM: RGEM: WRF: Maybe there is a better parameter to figure out where the front is now? I'm not sure those cloud depictions are all that helpful since they seem pretty course. Current satellite (sandwich depiction with visible and IR) -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Not looking at any other aspect of what the GFS is showing for now, that is some upslope heaven at 60 hours: a fetch at 850 right off of lakes Superior and Michigan -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
It gets really close to jumping it up the eastern slope of the Apps. The surface front has made it to around 100 miles (maybe) off the Gulf Coast, it will be interesting to see exactly where the SLP forms on that front -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
There is moisture over E TN up to 700 mb and even 500 mb over parts of eastern KY, so the upper low backing the flow could provide lift for it: 700 mb relative humidity -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
It is really bullish on the n stream upper low as it swings through -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
12z RGEM looks like it will come in a bit east as of around 40 hours into the run. Looks like more N stream interaction sooner on this run compared to 6z. -
December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
18z Euro showing some similar mixing, to the 3km NAM over western TN: