A weather system consisting of cold and warm air masses circulating around an area of low barometric pressure. In the Northern Hemisphere the masses circulate counterclockwise; in the Southern Hemisphere they move clockwise. Found on https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter
A weather system consisting of cold and warm air masses circulating around an area of low barometric pressure. In the Northern Hemisphere the masses circulate counterclockwise; in the Southern Hemisphere they move clockwise.