CAVOK, pronounced KAV-OH-KAY, is a term used in aviation to describe favourable weather conditions at an aerodrome. It may be spoken over the radio or provided in an ATIS, but is not used in METARs, SPECIs or TAFs in Canada.

The weather conditions are:

  • no cloud below 5,000 feet or below the highest minimum sector altitude, whichever is higher
  • no cumulonimbus
  • visibility of 6 statute miles or greater
  • no precipitation, thunderstorms, shallow fog, or low drifting snow

AIM Reference: RAC 1.4

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