Weather: flashcards
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- Ceiling
- Lowest BKN or OVC layer, or VV (vertical visibility).
- Density altitude
- Rises with heat, altitude, low pressure, humidity; performance falls.
Primary references
- Remote Pilot – Small Unmanned Aircraft Systems Airman Certification Standards (FAA-S-ACS-10B, April 2021) — Federal Aviation Administration (FAA) · government · retrieved 2026-09-21, verified 2026-09-21