Ultra-high resolution supercell simulations visualized with VAPOR v3
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- Опубліковано 6 вер 2024
- Leigh Orf's presentation at the 2019 NCAR International Computing for the Atmospheric Sciences Symposium in Stresa, Italy on 10 September 2019. The talk features new visualizations of a quarter-trillion gridpoint simulation (10 meter grid spacing) of a tornadic supercell thunderstorm.
favoloso!
The OG commenting on another OG. This is a match made in heaven.
I love your videos hank!
Clicked on this faster than I'd like to admit
It's super interesting to see things in your models that I've seen in videos from Pecos Hank and Skip Talbot, among others.
Yeh, Lee’s discussion with Pecos Hank was fascinating, in particular.
I find it so fascinating that scientific research always seem to take our existing theories on how our world works and ends up proving them completely wrong. I can't wait to finish my degree and support the field, its so fascinating and still so mysterious.
Also that's kind of funny that your grad student has the same first name as me.
When it comes right down to it, we really know bugger all. There’s always something new to learn and discover.
You are doing some of the most useful work on the planet! Thank you.
Interesting how you got into meteorology from a severe wx event that sparked fear initially. Same thing happened with me, and I'm sure a lot of people in the field. Mine started in MA too but I'm from the May 31, 1998 generation. Sounds like you were hit by the storm that spawned the Windsor Locks tornado.
Lee Orf and all his colleagues have really revolutionised Supercell and Tornado knowledge. I particularly liked Lee’s discussion with Pecos Hank, very interesting. Especially Lee saying he just couldn’t replicate the Pilger twin tornadoes in 2014.
I always think I've seen very cool things in your videos, and then a new one comes along and it's even cooler! Next up: full 3D VR supercell? Imagine flying around the supercell with a VR headset!
It's in the works. We're working to adapt to the Microsoft Hololens. It's really not that hard to do, it's just a matter of data formats (which become painful because many are proprietary).
Sweet! That might push me into getting one! (or at least heading to a store and trying one out, and just happening to view a simulated supercell! ;) )
It's also not difficult to do stereo rendering - you just render two images from different viewpoints. I can't see 3D due to having strabismus but it's another thing that's on my to-do list!
Dr. Orf, also in my experiment the the sub vortices that spin up in the main circulation seem to start at the bottom and then they extend all the way upward momentarily.
I like your U.H. resolution simulations. I am replicating the simulator designed by Hsu (1975) and am modifying it for translating capabilities. It is just a time passer, but its fun one.
Hello! I don't want to bother you, but a long time ago (Before you changed your YT channel name) you recommended a paper explaining how tornadoes can have two celled (downdrafts in their cores) structure. Those comments have since vanished, but I only recently got the ability to read scientific journals (Am back in University again), and I'd love to read that paper. Would you mind linking that paper again, so I can look at it?
Thanks for your research- its fascinating, and I think it will be rather useful.
-Gareth
Here you go! "A review of recent advances in tornado vortex dynamics" by
John T. Snow: agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/RG020i004p00953
Have we looked at these conditions for long lived and powerful tornadoes from a perspective of atmospheric reactions yet? Understanding the dynamics of vorticity are moving the field of study forward in giant leaps it seems, but I wonder if there are atmospheric conditions involving particles and pressures that can influence the power and longevity of these storms? Like draino and aluminum foil in a bottle, the reaction creates rapid air expansion. Wondering if air/water molecules at different pressures and temps can create that vacuum affect, especially as the cell itself is building higher and higher into the atmosphere. Possibly the elimination of the Cap leading to a massive movement of particles upward...mixed with shear and vorticity and you'll have what you need to sustain a powerful storm. Continuous feed of moisture and shear along with that steady inflow of cool air. We know molecules move and react differently to pressures and temps, even basic molecules not known to be necessarily volatile or explosive in nature can react to a rapidly changing environment. I have linked storms to vehicles before and still believe it holds at least a little weight. An engine runs ok on warm air, but it craves cool air for full efficiency and power...even rotating the air as it enters the manifold can improve the engines performance...what if a storm was the same way?
Yesterday tornado in Dallas.. Crazy scariest thing ever
I’m wondering if the lower the pressure the longer lasting the multiple vortices? Multiple vortices spin up in my experiment, however they don’t last. In my last experiment then spun up in the 2 major cycles that happened to be the two strongest. They also seem to spin up in the beginning of the cycle. I haven’t yet tried to increase the power, thus decreasing the pressure. Believing this could cause the multiple vortices to last longer. FYI I mean inside the main circulation.
Why am I here? Why did I listen to the whole thing?
You may ask yourself, "What is that beautiful house?"
You may ask yourself, "Where does that highway go to?"
And you may ask yourself, "Am I right, am I wrong?"
And you may say to yourself, "My God, what have I done?"
Fascinating work! Nice to able to see some well done simulations on tornadic development.
"The Lord is slow to anger and great in power, and the Lord will by no means clear the guilty. His way is in whirlwind and storm, and the clouds are the dust of his feet." Ezekiel 1:4
YES.
Can separate water,dust,dirt, the tornado has anything to do with energy..?
Well of course have u seen the lightening associated and seen with them?
Hey Leigh. Quick question, what "vorticity" is a supercell tilting into the updraft? Is it actual vortexes, but if not how does the environment impart the vorticity that an updraft ingests? Is it advected? What role do vorticity tubes play in this process and what exactly are they if the environmental shear is just 'imparting' the vorticity?
It's complicated! Certainly the upper part of the mesocyclone results in part from tilting of environmental vorticity, but at low levels, it appears that the cold pool generates a lot of horizontal vorticity (and some vertical) that is reorganized by the updraft. The latter part is the most interesting. It appears that the SVC is mostly generated within the cold pool. Some of my animations show pretty strong evidence of horizontal vortex tubes being tilted abruptly into the vertical. Also, horizontal vorticity is "stretched" as the super strong updraft pulls air into its bottom - the updraft can get very strong near the ground where it basically acts like a monster vacuum cleaner hose.
@@LeighOrfsThunderstormResearch Ah I see! Thank you! Also I think I might have misworded my question a bit, I meant the environmental vorticity in respect to mesocyclogenesis. It's from my knowledge that the environment a supercell evolves in does not contain any real horizontal vortexes or rolling tubes as commonly depicted in many illustrations. Rather, the shear alone imparts spin (or angular velocity to something, akin to solid body rotation), but how does that work in respect to an updraft? How is the updraft 'tilting' that environmental shear and becoming a real vortex, and what do vorticity tubes even represent in this? Sorry if that's off topic, but this is something that's been really bugging me and I haven't any clues!
Those tubes are for illustrative purposes only, but sometimes the boundary layer does show those kinds of tubes in actuality - and sometimes they show up in the cloud field! But, vorticity is vorticity as far as the equations are concerned. Those conceptual models (with the diagrams and the straight arrows and the roly poly arrows) are simplifications. One thing that's useful to remember is the mesocyclone is a region of local low pressure, and air tends to flow around centers of low pressure. In a tornado, it's a cyclostrophic balance. It's not so much so in a mesocyclone, but to a very rough extent, the air in a mesocyclone is rotating about a vertical axis, partly due to the fact that it's an area of low pressure. The tilting of horizontal environmental vorticity is more important in the higher reaches of the supercell's updraft, and when I look at my simulations, it's more important on the periphery of the updraft. The air that is baroclinically generated (along the cold pool density gradients) contains lots of horizontal vorticity, and this horizontal vorticity can be abruptly tilted vertically where it becomes part of the core of the mesocyclone, now rotating about a vertical axis. It's all very nonlinear and there are feedbacks. One of the most important recent discoveries is the role of concentrated environmental shear in the bottom 500 meters or so of the atmosphere. The more of that, the more likely you are to get long lived tornadoes (so long as you also have deep shear and lots of CAPE).
@@LeighOrfsThunderstormResearch I see! That was really informative, thank you. 😄
What do you think of theories revolving around the advection of momentum being primary cause for updraft rotation in a supercell such as described here journals.ametsoc.org/doi/full/10.1175/JAS-D-17-0091.1