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In aerodrome meteorological reports, cloud base information (e.g. SCT040) is measured above…

  • A

    aerodrome elevation.

  • B

    the GPS WGS-84 geoid.

  • C

    the radio altimeter datum.

  • D

    mean sea level.

ICAO Annex 3
4.5.3 Reference level

The height of cloud base shall be reported above aerodrome elevation. When a precision approach runway is in use which has a threshold elevation 15 m (50 ft) or more below the aerodrome elevation, local arrangements shall be made in order that the height of cloud bases reported to arriving aircraft shall refer to the threshold elevation. In the case of reports from offshore structures, the height of cloud base shall be given above mean seal level.

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