Definition
The hazardous practice of continuing flight under visual flight rules in deteriorating weather by descending and flying at low altitude beneath a lowering cloud base, often in reduced visibility, in an attempt to stay clear of clouds and remain in sight of the ground.
Plain English
Pushing on with a flight by flying lower and lower to stay below the clouds when the weather is getting worse, instead of turning back, climbing, or landing.
Context Anchor
Seen in aeronautical decision-making discussions, especially when a pilot is tempted to continue a flight under low clouds or in poor visibility.
Derivation
Scud' is an old sailing word for low, ragged clouds driven quickly by the wind. 'Scud running' literally means flying along underneath that low, broken cloud — a vivid name for the practice of squeezing under bad weather rather than avoiding it.
Why Pilots Care
It frequently results in controlled flight into terrain, wire strikes, or spatial disorientation because the pilot is maneuvering close to the ground with limited visibility and escape options.
Grounding Statement
The core danger is that the pilot trades altitude and escape options for a little more forward visibility.
Intuition Check
Scud running is not a clever weather technique. It is a warning label for a dangerous decision to keep going low under bad weather.
Example Sentence 1
Rather than scud running under a 500-foot ceiling to reach his destination, the pilot diverted to a nearby airport and waited for the weather to lift.
Example Sentence 2
Scud running along the river put the aircraft at constant risk of hitting rising terrain or power lines.