Figure 14: KVNX WSR-88D Reflectivity/Storm-Relative Motion 4 Panel at 1204 UTC 24 April 2006, showing the supercell thunderstorm bearing down on west Wichita. A rotational velocity couplet is highlighted within a white circle on the 4 panel of SRM (right). is the U.S. government's official web portal to all federal, state and local government web resources and services.