Plain English Meaning
A weather radar picture made from one sweep of the radar beam at its lowest angle, showing how heavy the precipitation is at that level. Stronger returns mean bigger or denser precipitation, like heavy rain or hail.
Full Definition
A NEXRAD weather radar product that displays the strength of returned radar energy from a single, low-elevation antenna scan, typically the lowest tilt angle (around 0.5 degrees above the horizon). The intensity of the returned signal is shown in color-coded levels (measured in dBZ) and indicates the and concentration of precipitation particles within the scanned slice of .