Figure 18c: KVNX WSR-88D Reflectivity cross section image at 1209 UTC from the Gibson Ridge GR2AE radar software. The massive red centroid in the vertical represents the 50 dBZ reflectivity core to greater than 40,000 ft AGL. Also notated in the image are the mid-level overhang which can be seen extending above the tight low-level reflectivity gradient and the weak echo region associated with the low-level inflow notch of the supercell. is the U.S. government's official web portal to all federal, state and local government web resources and services.