The bounded weak echo region (BWER) is a region of low radar reflectivity bounded above by an area of higher radar reflectivity which shows evidence of a strong updraft within mesocyclones. Radar analysts have recognized this phenomenon since at least 1973, using different elevation scans. Methods of objectively corroborating that a BWER is associated with a mesocyclone is done by using a weather radar with Doppler effect to obtain the precipitations velocities. This have been available operationally in United States since 1997 with the NEXRAD network. When using the lightning detection system, lightning holes (uncovered in 2004) correspond to where a BWER would be seen on radar.