A roost ring is a detection of birds via radar as they leave a roosting site. Examples: https://i.imgur.com/nGsOgyh.gif https://i.imgur.com/nGsOgyh.gif https

A roost ring is a detection of birds via radar as they leave a roosting site. Examples: https://i.imgur.com/nGsOgyh.gif https://i.imgur.com/nGsOgyh.gif https://www.weather.gov/grb/081110_roostring https://www.weather.gov/grb/081110_roostring