AMC1 MET.TR.225(c)(7)(iii) Forecasts for landing

• ED Decision 2022/004/R found in: ATM/ANS Provision of Services (2017/373) (Mar 2025)

AMC1 MET.TR.225(c)(7)(iii) Forecasts for landing ED Decision 2022/004/R 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. AMC1 MET.TR.225(c)(7)(iii) Forecasts for landing ED Decision 2022/004/R 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.