upper-level cyclone

A cyclonic circulation existing in the upper air, and specifically, as seen on an upper-level constant-pressure chart; often restricted to describe cyclones associated with relatively little cyclonic circulation in the lower atmosphere. Also known as high-level cyclone; low aloft; upper cyclone; upper-level low; upper low.

Related terms:

• upper-level anticyclone
• upper-level trough
• upper-level ridge
• upper cyclone
• high-level cyclone
• upper-level chart
• upper-level low
• cyclone wave
• upper-level high
• upper-level disturbance