Light
Dark
System
Log In
Loading...
Compare / EASA/
Incorporated Amendments
/
Compare & Highlight Differences
GM1 MET.TR.220(f)(1) Aerodrome forecasts
Available versions for ERULES-1963177438-3484
ED Decision 2022/004/R
found in: ATM/ANS Provision of Services (2017/373) (Feb 2023)
From
ATM/ANS Provision ... (Mar 2025)
ATM/ANS Provision ... (Feb 2023)
From section
To
ATM/ANS Provision ... (Mar 2025)
ATM/ANS Provision ... (Feb 2023)
To section
No visible text changes
0 removals
0 additions
View
Rich
Plain
Sync scrolling
Share
From
Show details
Hide details
To
Show details
Hide details
Version
Show side by side
GM1 MET.TR.220(f)(1) Aerodrome forecasts ED Decision 2022/004/R TAF — USE OF CHANGE AND TIME INDICATORS Guidance on the use of change and time indicators in TAF is given below: <table align="left" border="1" cellpadding="0" cellspacing="0" width="101%"> <tr> <td colspan="2" valign="top" width="25%"> <p><b>Change or time indicator</b></p> </td> <td valign="top" width="20%"> <p><b>Time period</b></p> </td> <td colspan="2" valign="top" width="54%"> <p><b>Meaning</b></p> </td> </tr> <tr> <td valign="top" width="12%"> <p>FM</p> </td> <td valign="top" width="12%"> </td> <td valign="top" width="20%"> <p>n<sub>d</sub>n<sub>d</sub>n<sub>h</sub>n<sub>h</sub>n<sub>m</sub>n<sub>m</sub></p> </td> <td colspan="2" valign="top" width="54%"> <p>Used to indicate a significant change in most weather elements occurring at n<sub>d</sub>n<sub>d</sub> day, n<sub>h</sub>n<sub>h</sub> hours and n<sub>m</sub>n<sub>m</sub> minutes (UTC);</p> <p>All the elements given before ‘FM’ are to be included following ‘FM’ (i.e. they are all superseded by those following the abbreviation).</p> </td> </tr> <tr> <td valign="top" width="12%"> <p>BECMG</p> </td> <td valign="top" width="12%"> </td> <td valign="top" width="20%"> <p>n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub></p> </td> <td colspan="2" valign="top" width="54%"> <p>The change is forecast to commence at n<sub>d1</sub>n<sub>d1</sub> day and n<sub>h1</sub>n<sub>h1</sub> hours (UTC) and be completed by n<sub>d2</sub>n<sub>d2</sub> day and n<sub>h2</sub>n<sub>h2</sub> hours (UTC);</p> <p>Only those elements for which a change is forecast are to be given following ‘BECMG’;</p> <p>The time period n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub> should normally be less than 2 hours and in any case should not exceed 4 hours.</p> </td> </tr> <tr> <td valign="top" width="12%"> <p>TEMPO</p> </td> <td valign="top" width="12%"> </td> <td valign="top" width="20%"> <p>n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub></p> </td> <td colspan="2" valign="top" width="54%"> <p>Temporary fluctuations are forecast to commence at n<sub>d1</sub>n<sub>d1</sub> day and n<sub>h1</sub>n<sub>h1</sub> hours (UTC) and cease by n<sub>d2</sub>n<sub>d2</sub> day and n<sub>h2</sub>n<sub>h2</sub> hours (UTC);</p> <p>Only those elements for which fluctuations are forecast are to be given following ‘TEMPO’; temporary fluctuations should last less than 1 hour in each instance, and in the aggregate, cover less than half of the period n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub>.</p> </td> </tr> <tr> <td rowspan="2" valign="top" width="12%"> <p>PROBnn</p> </td> <td valign="top" width="12%"> <p>—</p> </td> <td valign="top" width="20%"> <p>n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub></p> </td> <td rowspan="2" valign="top" width="29%"> <p>Probability of occurrence (in %) of an alternative value of a forecast element or elements;</p> <p>nn = 30 or nn = 40 only;</p> <p>To be placed after the element(s) concerned.</p> </td> <td valign="top" width="24%"> <p>—</p> </td> </tr> <tr> <td valign="top" width="12%"> <p>TEMPO</p> </td> <td valign="top" width="20%"> <p>n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub></p> </td> <td valign="top" width="24%"> <p>Probability of occurrence of temporary fluctuations.</p> </td> </tr> </table>
GM1 MET.TR.220(f)(1) Aerodrome forecasts ED Decision 2022/004/R TAF — USE OF CHANGE AND TIME INDICATORS Guidance on the use of change and time indicators in TAF is given below: <table align="left" border="1" cellpadding="0" cellspacing="0" width="101%"><tr><td colspan="2" valign="top" width="25%"><p><b>Change or time indicator</b></p></td><td valign="top" width="20%"><p><b>Time period</b></p></td><td colspan="2" valign="top" width="54%"><p><b>Meaning</b></p></td></tr><tr><td valign="top" width="12%"><p>FM</p></td><td valign="top" width="12%"></td><td valign="top" width="20%"><p>n<sub>d</sub>n<sub>d</sub>n<sub>h</sub>n<sub>h</sub>n<sub>m</sub>n<sub>m</sub></p></td><td colspan="2" valign="top" width="54%"><p>Used to indicate a significant change in most weather elements occurring at n<sub>d</sub>n<sub>d</sub> day, n<sub>h</sub>n<sub>h</sub> hours and n<sub>m</sub>n<sub>m</sub> minutes (UTC);</p><p>All the elements given before ‘FM’ are to be included following ‘FM’ (i.e. they are all superseded by those following the abbreviation).</p></td></tr><tr><td valign="top" width="12%"><p>BECMG</p></td><td valign="top" width="12%"></td><td valign="top" width="20%"><p>n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub></p></td><td colspan="2" valign="top" width="54%"><p>The change is forecast to commence at n<sub>d1</sub>n<sub>d1</sub> day and n<sub>h1</sub>n<sub>h1</sub> hours (UTC) and be completed by n<sub>d2</sub>n<sub>d2</sub> day and n<sub>h2</sub>n<sub>h2</sub> hours (UTC);</p><p>Only those elements for which a change is forecast are to be given following ‘BECMG’;</p><p>The time period n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub> should normally be less than 2 hours and in any case should not exceed 4 hours.</p></td></tr><tr><td valign="top" width="12%"><p>TEMPO</p></td><td valign="top" width="12%"></td><td valign="top" width="20%"><p>n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub></p></td><td colspan="2" valign="top" width="54%"><p>Temporary fluctuations are forecast to commence at n<sub>d1</sub>n<sub>d1</sub> day and n<sub>h1</sub>n<sub>h1</sub> hours (UTC) and cease by n<sub>d2</sub>n<sub>d2</sub> day and n<sub>h2</sub>n<sub>h2</sub> hours (UTC);</p><p>Only those elements for which fluctuations are forecast are to be given following ‘TEMPO’; temporary fluctuations should last less than 1 hour in each instance, and in the aggregate, cover less than half of the period n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub>.</p></td></tr><tr><td rowspan="2" valign="top" width="12%"><p>PROBnn</p></td><td valign="top" width="12%"><p>—</p></td><td valign="top" width="20%"><p>n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub></p></td><td rowspan="2" valign="top" width="29%"><p>Probability of occurrence (in %) of an alternative value of a forecast element or elements;</p><p>nn = 30 or nn = 40 only;</p><p>To be placed after the element(s) concerned.</p></td><td valign="top" width="24%"><p>—</p></td></tr><tr><td valign="top" width="12%"><p>TEMPO</p></td><td valign="top" width="20%"><p>n<sub>d1</sub>n<sub>d1</sub>n<sub>h1</sub>n<sub>h1</sub>/n<sub>d2</sub>n<sub>d2</sub>n<sub>h2</sub>n<sub>h2</sub></p></td><td valign="top" width="24%"><p>Probability of occurrence of temporary fluctuations.</p></td></tr></table>