A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Search Definitions case sensitive First Edition Preface  Second Edition Preface  Acknowledgments

upper-level cyclone—(Also called upper-level low, upper cyclone, upper low, high-level cyclone, low aloft.) A cyclonic circulation existing in the upper air; specifically as seen on an upper-level constant-pressure chart. This term is often restricted to such cyclones associated with relatively little cyclonic circulation in the lower atmosphere.