Upper-level cyclone

From Glossary of Meteorology
(Redirected from Upper low)

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.