Figure 11- NCEP ETA Model (1200 UTC 13 October 2001 )
                                                              time section over the tornado outbreak area (31.0N,  97.5W).
                                                             Shown are wind divergence (brown, 10^-5 sec^-1), model upward
                                                             vertical motion (cyan, mcrbrs sec^-1) and moisture flux divergence
                                                             (green, g kg^-1 / 6h).  The white dots represent approximate beginning
                                                             and endpoints of event tornadoes.