1. Chapter 6: mesoscale gravity waves This ppt summarizes the slides in the textbook. The theory is covered in class. Note: this ppt does not include section 6.6 Bores.

2. Iowa gravity wave time lapse movie mpeg You Tube

6. UK Ireland cold front

7. 5/24/2002, 21:07 UTC – IHOP

8. Aral Sea

9. Australia

11. Fig. 6.1: isochrones of a mesoscale gravity wave crest during a major East Coast snowstorm. The wave was detected in the pressure trace. The wind barbs indicate the vector surface wind shift upon wave passage. x Greensboro (GSO)

12. dry adiabat (  =46°C) moist adiabat (  w =16°C)  w values (°C) Fig. 6.9: the mesoscale gravity wave event may have been triggered by elevated convection, or gravity wave adjustment. The stable low-level layer may have allowed wave ducting towards the NE.

13. Fig. 6.11: synoptic setting of gravity wave activity (p’~ a few mb)

14. Fig. 6.2: SLP analysis in a Midwest snowstorm. dotted lines: wave crests, dashed lines: troughs

15. Fig. 6.10: schematic of a linear plane mesoscale gravity wave propagating to the right (U o =0)

16. see youtube video

17. Fig. 6.6: polarization relations between  ’, p’, u’, and w’ in a westward tilting internal gravity wave blue = cold, red = warm

18. Critical level: level where wave energy is absorbed cgcg c Fig. 6.7 Fig. 6.8

19. geostrophic adjustment: principle Rossby radius of deformation: see COMET module “the balancing act of geostrophic adjustment”the balancing act of geostrophic adjustment see YouTube video: geostrophic adjustment: inertio-gravity waves and the Coriolis force

20. Will a feature last or dissipate? Estimate its L R

21. 6.6 undular bores and solitary waves: separate slide show