Definition
A low-pressure weather system that develops as a wave-shaped disturbance along a stationary or slow-moving front, typically the polar front, where warm and cold air masses meet. The wave deepens into a cyclone with a warm front and cold front extending from a central low, and over time the cold front catches the warm front, forming an occluded front and eventually dissipating.
Plain English
A storm system that starts as a small bend in the boundary between warm and cold air, then grows into a full low-pressure system with fronts spinning around it. Most of the everyday weather across the mid-latitudes — rain, wind shifts, frontal passages — comes from these systems.
Context Anchor
Seen in weather theory, surface weather charts, and weather briefings when pilots are looking at large-scale storm development along fronts.
Derivation
Wave describes the shape of the initial bend that forms along the front, looking like a small wave on a line. Cyclone comes from the Greek kyklos, meaning circle or wheel, and refers to the rotating low-pressure circulation that develops as the wave deepens.
Why Pilots Care
It creates areas of turbulence, icing, low ceilings, and strong winds that affect route selection and flight safety.
Grounding Statement
Picture a long, calm boundary between cold air to the north and warm air to the south. A small bend forms in that line, the bend grows into a swirl, and that swirl becomes the low-pressure system on the weather map.
Intuition Check
A wave cyclone is not an ocean wave, and it is not automatically a hurricane or tornado. Here, “wave” means a bend in a weather front, and “cyclone” means rotating air around a low-pressure area.
Example Sentence 1
The briefer described the approaching low as a wave cyclone in its mature stage, with a well-defined cold front expected to cross the airport by evening.
Example Sentence 2
As the wave cyclone matured, the cold front brought gusty surface winds across the arrival airport.