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Found 18 results

  1. Hello everyone. I have recently started studying the book An Introduction to Dynamic Meteorology by James R. Holton to improve my understanding of supercell convective storms. However, there are some parts of it that quite confuse me and I was wondering if someone could help me to understand this. In the page 300, Holton linealizes a flow consisting of a single convective updraft in a basic state westerly flow which depends on z alone by making the vorticity w= j*du/dz+w'(x,y,z,t) and the speed of wind U= i*u+U'(x,y,z,t), being u the mean westerly flow. My question is: what do the terms w' and U' represent? I think that they are a first order terms on a Taylor expansion, but then, Holton writes the curl U x w =i*w'du/dz +j*uç', being ç the vorticity in the z axis, this debunks what I have written, since it seems that the module of the derivate of the vorticity (w') and the derivate of the vorticity on the z direction (ç) coexist. So, can someone please tell me what these terms, w' and U' represent? Also, on the resulting equation, dç'/dt = -u*dç'/dx + dw'/dy * Du/Dz, beinf d/di a partial derivative and D/Di a total one, I don't understand the difference between w' and ç'. Thanks in advance for your answers.
  2. Hello everyone. I have recently started studying the book An Introduction to Dynamic Meteorology by James R. Holton to improve my understanding of supercell convective storms. However, there are some parts of it that quite confuse me and I was wondering if someone could help me to understand this. In the page 300, Holton linealizes a flow consisting of a single convective updraft in a basic state westerly flow which depends on z alone by making the vorticity w= j*du/dz+w'(x,y,z,t) and the speed of wind U= i*u+U'(x,y,z,t), being u the mean westerly flow. My question is: what do the terms w' and U' represent? I think that they are a first order terms on a Taylor expansion, but then, Holton writes the curl U x w =i*w'du/dz +j*uç', being ç the vorticity in the z axis, this debunks what I have written, since it seems that the module of the derivate of the vorticity (w') and the derivate of the vorticity on the z direction (ç) coexist. So, can someone please tell me what these terms, w' and U' represent? Thanks in advance for your answers.
  3. Gorky

    IMG_6461.jpg

    Storm near Sledmere, East Yorkshire - July 6th 2017

    © Nathan Edwards 2017

  4. Gorky

    IMG_6316.jpg

    Storm near Sledmere, East Yorkshire - July 6th 2017

    © Nathan Edwards 2017

  5. Gorky

    IMG_6305.jpg

    Storm near Sledmere, East Yorkshire - July 6th 2017

    © Nathan Edwards 2017

  6. Hey all, I made a tornado compilation quite a while back (December 5th 2015) and I was very proud of my first compilation about tornadoes but, unfortunately it didn't get as much as attention I was hoping for on my youtube channel and that disappointed me a bit so I thought that I'll share it on here with people who have similar interests. https://www.youtube.com/watch?v=HC6wiS5GXkI sorry about the screen resolution I tried to fix it but It seemed that I'd have to start all over again to get it to fix with the correct resolution so I just kept it as it is.
  7. Just saw this picture posted on Reddit, did a reverse image search on it and it seems to have done its rounds online, so thought I'd also share it, mainly because it's one of those picture's that make you go "WOW!". (Note: This picture is *not* mine (never been lucky enough to get to the States), however the person who took this picture goes by the name of Ryan Shepard.) -> Full Size (2880x1920) (414KB)
  8. Team Jo

    Hello Structure

    From the album: Storm Chase T2 2013

    © Jo Lough

  9. From the album: Weather Studios

    The last storm cell in a line of four during a memorable evening in Russell county, Kansas. Several chasers intercepted a long lived tornado underneath this storm but we couldn't turn down the opportunity to watch from further afar and capture some of the prolific lightning from this storm.

    © Weather Studios

  10. From the album: Weather Studios

    As this supercell storm neared the town of Piedmont, Oklahoma it joined up with another storm in the area and became a monster supercell. We were managed to keep in front of this storm and had just seconds to capture the amazing structure before the outflow winds hit from the leading edge of the storm.

    © Weather Studios

  11. From the album: Weather Studios

    The supercell storm near Piedmont, Oklahoma, that we'd been tracking from initiation, took on the form of the foreboding 'mothership' structure. Tried as it might, the storm seemed just fractionally too high to produce a tornado, but the mobile tornado sirens were issued just in case.

    © Weather Studios

  12. From the album: Weather Studios

    The fantastic structure of this classic supercell storm was only visible when lit up by it's own lightning. The photo was taken just after dusk on the Front Range in Colorado.

    © Weather Studios

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