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Why Not Look Only at Model Output?PowerPoint Presentation

Why Not Look Only at Model Output?

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Good Web Site to Explore VV

- http://www.twisterdata.com/

Comparison of Various Forms of the Q-G Omega Equation

- Classic (Two terms: differential vorticity advection, Laplacian of the thermal wind)
- The result is the difference between two large terms resulting in large truncation error.
- Cannot estimate reliably from vorticity advection at a single level or from warm advection alone.
- Using at a single level, best done at 500 hPa for strong events. Really need a 3D solution for an accurate answer.
Trenberth/Sutcliffe formulation (advection of absolute vorticity by the thermal wind) is more accurate since no cancellation problem.

- Q-Vector approach is the best in many ways
- No cancellation problems
- Includes deformation term
- Provides insights into the lower branch of the ageostrophic circulation forced by the geostrophic forcing
- Provides insights into frontogenesis
- Allows rapid and intuitive graphical interpretation

QG Diagnostics Online

- Classic approach:http://www.mmm.ucar.edu/people/tomjr/files/realtime/qg_diag/Omeg700Tot-NorAmer/res.html
- Sutcliffe-Trenberth:http://www.mmm.ucar.edu/people/tomjr/files/realtime/qg_diag/OmegSutTren700Tot-NorAmer/res.html
- Q-vectorhttp://www.mmm.ucar.edu/people/tomjr/files/realtime/qg_diag/OmegQvec700Tot-NorAmer/res.html

Vertical Motion

- Can be as the complex sum of:
- QG motions (relatively large scale and smooth)
- Orographic forcing
- Convective forcing
- Gravity waves and other small-scale stuff

- QG diagnostics helpful for seeing the big picture

But usually there is much more going on, so be VERY careful in application of simple jet streak model

- Garp example…