GM1
MET.TR.220(g) Aerodrome forecasts
USE OF PROBABILITY INDICATORS
(a) A probability of an alternative value or
change of less than 30 % should not be considered sufficiently
significant to be indicated.
(b) A probability of an alternative value or
change of 50 % or more should not be considered a probability but,
instead, should be indicated, as necessary, by use of the change indicators
‘BECMG’ or ‘TEMPO’ or by subdivision of the validity period using the
abbreviation ‘FM’. The probability group should neither be used to qualify the
change indicator ‘BECMG’ nor the time indicator ‘FM’.
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