Definition 1 of 2
Definition
In meteorology and aerodynamics, any departure from a steady or undisturbed state in a fluid such as the atmosphere. A disturbance may appear as a small variation in pressure, wind, or temperature, or as a larger organized system such as a developing low-pressure area, a wave in the airflow, or turbulent motion around an aircraft.
Plain English
Something that breaks up the smooth, settled flow of the air. It can be small, like a bump of turbulence, or large, like a weather system that shifts the wind and pressure across a region.
Context Anchor
Seen in weather briefings, forecasts, and discussions of weather systems that may affect a planned route of flight.
Derivation
From the Latin disturbare, meaning 'to throw into confusion.' In aviation it keeps that core idea: the air is doing one thing in an orderly way, and something has thrown it out of that order.
Why Pilots Care
Disturbances in the atmosphere are the root of changing weather, turbulence, and shifting winds. Recognizing a disturbance on a chart or briefing helps the pilot anticipate ride quality, wind shifts, and possible deterioration along the route.
Grounding Statement
Picture a still pond. Drop in a stone and ripples spread outward. The atmosphere works the same way: when something disturbs steady air, the effect spreads as changing wind, pressure, or turbulence.
Intuition Check
Do not read disturbance here as just a small annoyance or distraction. In aviation weather, it means a real disruption in the atmosphere that may change flight conditions.
Example Sentence 1
The forecaster pointed out a small disturbance moving across the plains that could bring scattered showers by afternoon.
Example Sentence 2
Pilots watch for a disturbance on the chart because it often brings clouds and changing winds.