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Everything posted by Holston_River_Rambler
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6z Euro improved a bit. 0z: 6z: I don't have Kuchera ratios for the 6z, but suspect it would look a little better from TRI and points N and E.
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Old 6z GEFS version mean looks tasty: New 6z GEFS version, more dispersed:
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December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Long range Euro pops a Miller B, this time with a little ore cold air. Different models have been looking at that time frame for a while. Will be interesting to see if that is a legit storm window. Verbatim, some of you middle and west TN would like it, some, schmaybe not. -
The big difference that I see (and it isn't necessarily a deal breaker) is that the anafrontal system from last Dec. had a more SW - NE orientation and this one is more meridional. Last year's: (Bolded in case it messes with anyone to see this map, lol)
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18z Euro pops the leeside low a touch further south than 12z. 999 mb just south or Roanoke, near the NC border.
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Fall/Winter 20-21 General Observations
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Neighbor had a telescope and I got to see ye olden conjunction, woot woot! It was able to resolve the rings of Saturn and some of Jupiter's moons! -
Check out the NAM sounding for the second piece of energy mentioned above (using it because I don't have RGEM soundings out that far): Moisture is limited to below 700 mb, but the DGZ is saturated from 875 mb - 825 mb.
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RGEM looks kinda like the GFS on the low riding the front scenario, but is really keying in on the second piece of energy dropping in for some extra umphh. That has the potential to overperform on snow showers, since it adds life to the normal orographic lift with the CAA.
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Fall/Winter 20-21 General Observations
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Plateau sunset: You can hear the wind aloft. Something fun must be going on higher up. I took a short time lapse of the clouds rolling. You can actually see this cloud formation on the local GOES 16 imagery, at the bottom of the Frozen Head mts. Really, just a vividly blue sky, after the drear of late. -
NAM NAMed you @BlunderStorm Not great for the rest of us in East TN, but that is the best the NAM has looked so far: (past 3 runs trend):
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Here are our 2 main pieces of energy: I think the piece to the north is the most important one for us, since it is the piece that rounds the bottom of the trough that the initial piece carves out.
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A decent bump in the presentation of the 12 hr SREF snow mean. Curious to see if the NAM comes in a bit better this time.
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We're doing this GEFS, whether you like it or not. SREF H5 is digging the trough more than 9z: 15z 9z:
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Even if this storm fails, we should keep this open as the GEFS Dandridge Dollop thread. Model specific banter at it's finest!
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December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
One of the blockier patterns I've seen showing up at the end of the Euro OP: not sure if it would get the job done for us, in that specific set up, but cool to see the blocking. -
Fall/Winter 20-21 General Observations
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Awesome satellite imagery early this AM that shows some of the local microclimates. What especially stands out to me are the WAA areas in the eastern Valley and the areas up against that N. plateau that normally get a little CADing in in Miller B type systems: probably a lot more to learn from a satellite image like this. -
Here are the winter panels. Kuchera ratios aren't available to me for the 6z Euro and 18z Euro. I suspect the accums below would be a bit (maybe not much though) higher with frigid 850s. Also keep in mind it is still snowing in NE sections past the end of the 6z Euro's run:
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We can do it the old fashiond way until we get winter panels: 3hr precip accum.: 850 temps: Looks like the 850 front hits the eastern plateau around Noon Christmas Eve and makes it to the mts by 6 PM. I would say it spreads a general .25 - .3 (maybe more in extreme NE areas) in that window. Keep in mind, if you are looking at these gifs, the precip one shows the past 3hrs of precip, so you have to look at the the temps at the later time stamp and guestimate a bit.
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Energy looks RGEMish on the 6z Dr. Schmaybe Trying to pinch off a piece of energy at the bottom of the trough and go negative, ever so slightly: Digging the bottom of the trough deeper by a couple hundred miles, to my eye. Precip. map isn't out yet.
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Thanks to all for the awesome posts overnight! Special thank you to @Stovepipe. I laughed more at that picture than I have at anything on here since the @PowellVolz "Chicken in Doghouse" gif (patent pending).
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And just so everyone is clear, I did not edit that, lol. Go to https://weather.cod.edu/forecast/, choose today's 18z GEFS there and drag the timer to hour 138. Zoom in from there.
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Lol, I just realized what the old GEFS was doing to us with that higher dollop around Dandridge.
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Weird bump on the old version of the18z GEFS mean around Dandridge: You have to zoom into see it. New version of the 18z GEFS was more stingy, but did improve for a similar area over 12z. Toggled the two runs in a gif below. (More light blue = newer run)
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December 2020 Medium/Long Term Pattern Discussion.
Holston_River_Rambler replied to John1122's topic in Tennessee Valley
Yup. I bet there will be a good NAMing though, before all is said and done, either way it falls out.
