PHAK · Chapter 12: Weather Theory
FAA · Retrieved 2026-09-05
Educational reference; original Owl summariesWEATHER & ATMOSPHERE
Fog & visibility
FLIGHT SCIENCE / CONCEPT REFERENCE
SCIENCEConditions & principles
Suspended water droplets near the surface reduce horizontal visibility.
REFERENCE COVERAGE3 / 3 editorial sections
PROVENANCE1 linked source
LAST RETRIEVED2026-09-05
Editorial section coverage describes the article structure, not scientific validation or completeness.
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01
Mechanism
Air can reach saturation through cooling or added moisture. Radiation cooling, movement over a cold surface, and mixing can produce different fog environments.
02
Aircraft response
Reduced visual references affect orientation and the transition between instrument and visual cues; fog itself is primarily a visibility condition.
03
Context & interpretation
Temperature and dew-point proximity indicate moisture conditions but do not alone determine visibility. Fog formation and dissipation depend on wind, surface energy and moisture.
Sources & context
Educational explanation of physical mechanisms. Aircraft-specific procedures, limitations and current weather information are separate references.