cyclone

A low-pressure region of the earth’s atmosphere with roundish to elongated-oval ground plan, in-moving air currents, centrally upward air movement, and generally outward movement at various higher elevations in the troposphere.

Related terms:

• upper-level cyclone
• cyclone wave
• Genoa cyclone
• subtropical cyclone
• primary cyclone
• extratropical cyclone
• warm cyclone
• occluded cyclone
• cold-core cyclone
• warm-core cyclone