Figure 12.  Several surface fields are overlaid and looped (12 to 16 UTC on 6 April 2003) to show the warm moist advection over the region ahead of the first MCS. The background image indicates moisture transport in kts g/kg (green shade highest), and is overlaid by three hour pressure falls in mb (cyan), equivalent potential temperature in deg K (yellow), and surface observations. Notice the 2 mb pressure fall center near Vicksburg, MS at 16 UTC, just ahead of the developing MCS.