CAVOK
CAVOK is an aviation acronym standing for Clouds and Visibility OK. It's used in aviation weather reports (METARs and TAFs) to indicate good flying conditions. Specifically, it implies a set of criteria are met.
Here's a breakdown:
Clouds: There must be:
No clouds below 5,000 feet (1,500 meters) or below the highest minimum sector altitude, whichever is higher.
No cumulonimbus clouds (CB) or towering cumulus clouds (TCU) at any altitude.
For more information about clouds, see Clouds.
Visibility: The horizontal visibility must be 10 kilometers (6.2 miles) or more.
Weather: No significant weather phenomena are occurring. This includes precipitation (rain, snow, etc.), thunderstorms, fog, mist, haze, dust storms, sandstorms, etc.
When CAVOK is reported, pilots can generally assume good visual flight rules (VFR) conditions exist. However, pilots are always responsible for assessing the actual weather conditions and making their own decisions based on all available information. CAVOK doesn't necessarily mean perfectly clear skies, but that conditions meet the specified thresholds for cloud cover, visibility, and significant weather. The definition can also vary slightly based on national regulations and standards. It essentially conveys that the weather is "OK" for flying.
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