bounded weak echo region bounded weak echo region known vault radar signature thunderstorm characterized local minimum radar low levels extends upward surrounded higher aloft feature associated strong found region thunderstorm seen visually noted radar imagery severe thunderstorms lightning detection system equivalent known lightning hole description attributes nearly vertical channel weak radar echo surrounded sides significantly stronger echoes called vault related strong severe convective storm carries newly formed atmospheric called high levels grow radar sizes typically found mid levels convective storms kilometres kilometres ground kilometers horizontal diameter identifying location region important linked locations severe weather normally occurs presence method thunderstorm strength lemon technique strength supports growth large vault displaced slightly direction motion parent storm detection bounded weak echo region region low radar bounded area higher radar shows evidence strong radar analysts recognized phenomenon different elevation methods associated weather radar effect obtain available operationally united_states network lightning detection system lightning holes uncovered correspond seen radar cross section dimensional thunderstorm shows vault better developed marshall radar observatory canada locate region thunderstorm late 1980s radar uses angles giving good vertical resolution united_states fewer scanning angles radar makes difficult detect located possible cross section view related developed national_weather_service determine regions gradient dimensions presence convection development pronounced lead tropical cyclone like radar signatures land located low angle plan position indicator lightning detection system lightning holes uncovered correspond seen radar
Bounded weak echo region