AMC1 MET.TR.225(c)(7)(iii) Forecasts for landing
USE OF CHANGE GROUPS — TEMPO
(a) When the period of the temporary
fluctuations in the meteorological conditions is forecast to begin and end
wholly within the TREND forecast period, the beginning and end of the period
of the temporary fluctuations should be indicated by using the abbreviations
‘FM’ and ‘TL’ respectively, with their associated time groups.
(b) When the period of the temporary
fluctuations is forecast to commence at the beginning of the TREND forecast
period but cease before the end of that period, the abbreviation ‘FM’ and its
associated time group should be omitted and only ‘TL’ and its associated time
group should be used.
(c) When the period of the temporary
fluctuations is forecast to begin during the TREND forecast period and cease
by the end of that period, the abbreviation ‘TL’ and its associated time group
should be omitted and only ‘FM’ and its associated time group should be used.
(d) When the period of the temporary
fluctuations is forecast to commence at the beginning of the TREND forecast
period and cease by the end of that period, both abbreviations ‘FM’ and ‘TL’
and their associated time groups should be omitted and the change indicator
‘TEMPO’ should be used alone.
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