VIL
This WSR-88D product displays reflectivity data converted into liquid water equivalent via an empirically-derived relationship which assumes that all reflectivity returns are from liquid water. VIL values are derived for each 2.2 nm by 2 nm (4.0 km by 3.7 km) grid box for each elevation angle within 124 nm (230 km) radius of the radar then vertically integrated. It is used to:Indicate presence and approximate size of hail (used in conjunction with spotter reports), Locate the most significant thunderstorms or areas of possible heavy rainfall; and Rapid decrease in VIL values may signify the onset of wind damage.
