1 / 54

Moore, Oklahoma May 20, 2013

Moore, Oklahoma May 20, 2013. Shawnee/. MPEX Mobile Soundings 19 May 2013. CSU 21 UTC. CSU 19 UTC. CSU 23 UTC. WRF OUN 19 UTC. WRF OUN 23 UTC. WRF OUN 00 UTC. Trier et al. MWR 2015. Ensemble-analyzed circulation along dry line: 19 May 2013. Supercells. MICRO-. PHYSICS.

weissa
Télécharger la présentation

Moore, Oklahoma May 20, 2013

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Moore, Oklahoma May 20, 2013 Shawnee/

  2. MPEX Mobile Soundings 19 May 2013 CSU 21 UTC CSU 19 UTC CSU 23 UTC WRF OUN 19 UTC WRF OUN 23 UTC WRF OUN 00 UTC

  3. Trier et al. MWR 2015 Ensemble-analyzed circulation along dry line: 19 May 2013

  4. Supercells

  5. MICRO- PHYSICS

  6. Physical processes controlling cell types: • Buoyancy processes: basic updraft/downdraft, (ordinary cells) • Gust front processes: triggering of new cells, upscale growth, (multicells) • Dynamic processes: rotating updraft, dynamic vertical pressure gradient forcing, (supercells)

  7. Physical processes controlling cell types: • Buoyancy processes: basic updraft/downdraft, (ordinary cells) • Gust front processes: triggering of new cells, upscale growth, (multicells) • Dynamic processes: rotating updraft, dynamic vertical pressure gradient forcing, (supercells)

  8. Momentum Eq. Dynamic Pressure Eq. --

  9. Linearise pressure eq. about U(z), V(z) (environmental vertical wind shear) So, since

  10. 2D Updraft in Sheared Environment:

  11. Vorticity Equation: Vertical Vorticity: tilting stretching

  12. Vortex Tube Circulation:

  13. Theorems for inviscid fluids with conservative external forces (e.g., no baroclinicity, buoyancy) (Helmholtz, 1858) ….Vortex lines (tubes) are material lines that are frozen into the fluid. ….The circulation (strength) of a vortex tube is invariant …The circulation on any curve around a vortex tube is constant along the tube.

  14. Tilting: Linearized about a mean vertical wind shear:

  15. Vertical Momentum Eq. (rewritten) (dynamic) + (buoyancy)

  16. (H = horizontal shearing deformation) So, for a wind profile in pure rotation: So, again, since

  17. Supercell Hodographs: Supercell processes are Galilean invariant!!!

  18. Linearise pressure eq. about U(z), V(z) (environmental vertical wind shear) So, since

  19. Bunkers et al. WAF 2000

  20. Weisman and Rotunno, Jas 2000

More Related