| ![](http://www.confex.com/static/images/flag.png) | 3M.4 | The Influence of Vertical Shear on Observed Lake–Effect Snow Bands Stephen K. Jackman, Univ. of Illinois, Urbana, Illinois; and N. F. Laird and D. A. R. Kristovich |
| 11:30 AM | 3M.4A | A study of coherent tropopause disturbances within the Northern Hemispheric circumpolar vortex Joseph R. Kravitz, Univ. at Albany/SUNY, Albany, NY; and L. F. Bosart, D. Keyser, and A. R. Aiyyer |
| 11:45 AM | 3M.5 | Numerical Simulations of Vertically Propagating Gravity Waves in the Stratosphere above a Hydrostatic Large Amplitude Surface Gravity Wave on December 12th, 2002 ![wrf recording](/static/img/filetypes/16x16/wrf.gif) Paul Samuel Suffern, North Carolina State Univ., Raleigh, NC; and M. L. Kaplan and Y. L. Lin |
| 12:00 PM | 3M.6 | The impact of superimposed low-level jets during the 2003 Presidents' Day winter storm ![wrf recording](/static/img/filetypes/16x16/wrf.gif) Michael T. Kiefer, North Carolina State Univ., Raleigh, NC; and M. L. Kaplan and Y. L. Lin |
| 12:15 PM | 3M.7 | Surges in the Ross Ice Shelf Air Stream due to topographically trapped waves Amanda S. Adams, Univ. of Calgary, Calgary, Alberta, Canada; and G. J. Tripoli |