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Appendix 6
Available versions for ERULES-1963177438-3070
Regulation (EU) 2021/1338
found in: ATM/ANS Provision of Services (2017/373) (Mar 2025)
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Appendix 6 Regulation (EU) 2021/1338 <table border="0" cellpadding="0" cellspacing="0" width="680"><tr><td colspan="5" valign="top" width="680"><p><b>Template for advisory for volcanic ash</b></p><p>Key:</p><p>M = inclusion mandatory;</p><p>O = inclusion optional;</p><p>C = inclusion conditional, included whenever applicable.</p><p>Note 1: The ranges and resolutions for the numerical elements included in volcanic ash advisory are shown in Appendix 8.</p><p>Note 2: The explanations for the abbreviations can be found in ICAO Doc 8400 Procedures for Air Navigation Services — ICAO Abbreviations and Codes (PANS-ABC).</p><p>Note 3: The inclusion of a colon (‘:’) after each element heading is mandatory.</p><p>Note 4: Row numbers in the ‘Ref.’ column are included only for clarity and ease of reference, and are not part of the advisory for volcanic ash.</p></td></tr><thead><tr><td valign="top" width="38"><p>Ref. </p></td><td valign="top" width="95"><p>Element</p></td><td valign="top" width="161"><p>Detailed content</p></td><td colspan="2" valign="top" width="387"><p>Template(s)</p></td></tr></thead><tr><td valign="top" width="38"><p>1</p></td><td valign="top" width="95"><p>Identification of the type of message (M)</p></td><td valign="top" width="161"><p>Type of message </p></td><td colspan="2" valign="top" width="387"><p>VA ADVISORY</p></td></tr><tr><td valign="top" width="38"><p>2</p></td><td colspan="4" valign="top" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>3</p></td><td valign="top" width="95"><p>Status indicator (C) (<a href="#_ftn112">[112]</a>)</p></td><td valign="top" width="161"><p>Indicator of test or exercise</p></td><td valign="top" width="161"><p>STATUS:</p></td><td valign="top" width="227"><p>TEST or EXER</p></td></tr><tr><td valign="top" width="38"><p>4</p></td><td colspan="4" valign="top" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>5</p></td><td valign="top" width="95"><p>Time of origin (M)</p></td><td valign="top" width="161"><p>Year, month, day, time in UTC</p></td><td valign="top" width="161"><p>DTG:</p></td><td valign="top" width="227"><p>nnnnnnnn/nnnnZ</p></td></tr><tr><td valign="top" width="38"><p>6</p></td><td colspan="4" valign="top" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>7</p></td><td valign="top" width="95"><p>Name of VAAC (M)</p></td><td valign="top" width="161"><p>Name of VAAC </p></td><td valign="top" width="161"><p>VAAC:</p></td><td valign="top" width="227"><p>nnnnnnnnnnnn</p></td></tr><tr><td valign="top" width="38"><p>8</p></td><td colspan="4" valign="top" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>9</p></td><td valign="top" width="95"><p>Name of volcano (M)</p></td><td valign="top" width="161"><p>Name and International Association of Volcanology and Chemistry of the Earth’s Interior number of volcano</p></td><td valign="top" width="161"><p>VOLCANO:</p></td><td valign="top" width="227"><p>nnnnnnnnnnnnnnnnnnnnnn [nnnnnn]</p><p>or UNKNOWN</p><p>or UNNAMED</p></td></tr><tr><td width="38"><p>10</p></td><td colspan="4" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>11</p></td><td valign="top" width="95"><p>Location of volcano (M)</p></td><td valign="top" width="161"><p>Location of volcano in degrees and minutes</p></td><td valign="top" width="161"><p>PSN:</p></td><td valign="top" width="227"><p>Nnnnn or Snnnn Wnnnnn or Ennnnn</p><p>or UNKNOWN</p></td></tr><tr><td width="38"><p>12</p></td><td colspan="4" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>13</p></td><td valign="top" width="95"><p>State or region (M)</p></td><td valign="top" width="161"><p>State, or region if ash is not reported over a State</p></td><td valign="top" width="161"><p>AREA:</p></td><td valign="top" width="227"><p>nnnnnnnnnnnnnnnn or UNKNOWN</p></td></tr><tr><td valign="top" width="38"><p>14</p></td><td colspan="4" valign="top" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>15</p></td><td valign="top" width="95"><p>Summit elevation (M)</p></td><td valign="top" width="161"><p>Summit elevation in m (or ft)</p></td><td valign="top" width="161"><p>SUMMIT ELEV:</p></td><td valign="top" width="227"><p>nnnnM (or nnnnnFT)</p><p>or SFC </p><p>or UNKNOWN</p></td></tr><tr><td width="38"><p>16</p></td><td colspan="4" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>17</p></td><td valign="top" width="95"><p>Advisory number (M)</p></td><td valign="top" width="161"><p>Advisory number: year in full and message number (separate sequence for each volcano)</p></td><td valign="top" width="161"><p>ADVISORY NR:</p></td><td valign="top" width="227"><p>nnnn/nnnn</p></td></tr><tr><td valign="top" width="38"><p>18</p></td><td colspan="4" valign="top" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>19</p></td><td valign="top" width="95"><p>Information source (M)</p></td><td valign="top" width="161"><p>Information source using free text</p></td><td valign="top" width="161"><p>INFO SOURCE:</p></td><td valign="top" width="227"><p>Free text up to 32 characters</p></td></tr><tr><td valign="top" width="38"><p>20</p></td><td colspan="4" valign="top" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>21</p></td><td valign="top" width="95"><p>Colour code (O)</p></td><td valign="top" width="161"><p>Aviation colour code</p></td><td valign="top" width="161"><p>AVIATION COLOUR CODE:</p></td><td valign="top" width="227"><p>RED or ORANGE or YELLOW or GREEN or UNKNOWN or NOT GIVEN or NIL</p></td></tr><tr><td valign="top" width="38"><p>22</p></td><td colspan="4" valign="top" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>23</p></td><td valign="top" width="95"><p>Eruption details (M) (<a href="#_ftn113">[113]</a>)</p></td><td valign="top" width="161"><p>Eruption details (including date/time of eruption(s))</p></td><td valign="top" width="161"><p>ERUPTION DETAILS:</p></td><td valign="top" width="227"><p>Free text up to 64 characters</p><p>or UNKNOWN</p></td></tr><tr><td width="38"><p>24</p></td><td colspan="4" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>25</p></td><td valign="top" width="95"><p>Time of observation (or estimation) of volcanic ash clouds (M)</p></td><td valign="top" width="161"><p>Day and time (in UTC) of observation (or estimation) of volcanic ash clouds</p></td><td valign="top" width="161"><p>OBS (or EST) VA DTG:</p></td><td valign="top" width="227"><p>nn/nnnnZ</p></td></tr><tr><td valign="top" width="38"><p>26</p></td><td colspan="4" valign="top" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>27</p></td><td valign="top" width="95"><p>Observed or estimated volcanic ash clouds (M)</p></td><td valign="top" width="161"><p>Horizontal (in degrees and minutes) and vertical extent at the time of observation of the observed or estimated volcanic ash clouds or, if the base is unknown, the top of the observed or estimated volcanic ash clouds;</p><p>Movement of the observed or estimated volcanic ash clouds</p></td><td valign="top" width="161"><p>OBS VA CLD or EST VA CLD:</p></td><td valign="top" width="227"><p>TOP FLnnn or SFC/FLnnn or FLnnn/nnn [nnKM WID LINE BTN (nnNM WID LINE BTN)] Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn]]</p><p>MOV N nnKMH (or KT) or</p><p>MOV NE nnKMH (or KT) or </p><p>MOV E nnKMH (or KT) or </p><p>MOV SE nnKMH (or KT) or </p><p>MOV S nnKMH (or KT) or </p><p>MOV SW nnKMH (or KT) or </p><p>MOV W nnKMH (or KT) or </p><p>MOV NW nnKMH (or KT)</p><p>or</p><p>VA NOT IDENTIFIABLE FM SATELLITE DATA</p><p>WIND FLnnn/nnn nnn/nn[n]KT (<a href="#_ftn114">[114]</a>) or WIND FLnnn/nnn VRBnnKT or WIND SFC/FLnnn nnn/nn[n]KT or WIND SFC/FLnnn VRBnnKT</p></td></tr><tr><td valign="top" width="38"><p>28</p></td><td colspan="4" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>29</p></td><td valign="top" width="95"><p>Forecast height and position of the volcanic ash clouds<br/> (+6 HR) (M)</p></td><td valign="top" width="161"><p>Day and time (in UTC) <br/> (6 hours from the ‘Time of observation (or estimation) of volcanic ash clouds’ given in Item 12)</p><p>Forecast height and position (in degrees and minutes) for each volcanic ash cloud mass for that fixed valid time</p></td><td valign="top" width="161"><p>FCST VA CLD +6 HR:</p></td><td valign="top" width="227"><p>nn/nnnnZ</p><p>SFC or FLnnn/[FL]nnn [nnKM WID LINEBTN (nnNM WID LINE BTN)]Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn]] (<a href="#_ftn115">[115]</a>),(<a href="#_ftn116">[116]</a>)</p><p>or NO VA EXP</p><p>or NOT AVBL</p><p>or NOT PROVIDED</p></td></tr><tr><td width="38"><p>30</p></td><td colspan="4" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>31</p></td><td valign="top" width="95"><p>Forecast height and position of the volcanic ash clouds (+12 HR) (M)</p></td><td valign="top" width="161"><p>Day and time (in UTC) <br/> (12 hours from the ‘Time of observation (or estimation) of volcanic ash clouds’ given in Item 12)</p><p>Forecast height and position (in degrees and minutes) for each volcanic ash cloud mass for that fixed valid time</p></td><td valign="top" width="161"><p>FCST VA CLD +12 HR:</p></td><td valign="top" width="227"><p>nn/nnnnZ</p><p>SFC or FLnnn/[FL]nnn [nnKM WID LINE BTN (nnNM WID LINE BTN)] Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn]] (<a href="#_ftn117">[117]</a>),(<a href="#_ftn118">[118]</a>)</p><p>or NO VA EXP</p><p>or NOT AVBL</p><p>or NOT PROVIDED</p></td></tr><tr><td width="38"><p>32</p></td><td colspan="4" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>33</p></td><td valign="top" width="95"><p>Forecast height and position of the volcanic ash clouds </p><p>(+18 HR)</p></td><td valign="top" width="161"><p>Day and time (in UTC) <br/> (18 hours from the ‘Time of observation (or estimation) of volcanic ash clouds’ given in Item 12)</p><p>Forecast height and position (in degrees and minutes) for each volcanic ash cloud mass for that fixed valid time</p></td><td valign="top" width="161"><p>FCST VA CLD +18 HR:</p></td><td valign="top" width="227"><p>nn/nnnnZ</p><p>SFC or FLnnn/[FL]nnn [nnKM WID LINE BTN (nnNM WID LINE BTN)] Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] (<a href="#_ftn119">[119]</a>),(<a href="#_ftn120">[120]</a>)</p><p>or NO VA EXP</p><p>or NOT AVBL</p><p>or NOT PROVIDED</p></td></tr><tr><td valign="top" width="38"><p>34</p></td><td colspan="4" valign="top" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>35</p></td><td valign="top" width="95"><p>Remarks (M) (<a href="#_ftn121">[121]</a>)</p></td><td valign="top" width="161"><p>Remarks, as necessary</p></td><td valign="top" width="161"><p>RMK:</p></td><td valign="top" width="227"><p>Free text up to 256 characters</p><p>or NIL</p></td></tr><tr><td width="38"><p>36</p></td><td colspan="4" width="643"><p>New line</p></td></tr><tr><td valign="top" width="38"><p>37</p></td><td valign="top" width="95"><p>Next advisory (M)</p></td><td valign="top" width="161"><p>Year, month, day and time in UTC</p></td><td valign="top" width="161"><p>NXT ADVISORY:</p></td><td valign="top" width="227"><p>nnnnnnnn/nnnnZ</p><p>or NO LATER THAN nnnnnnnn/nnnnZ </p><p>or NO FURTHER ADVISORIES </p><p>or WILL BE ISSUED BY nnnnnnnn/nnnnZ </p></td></tr></table> --- [[112]](#_ftnref112) Used only when the message is issued to indicate that a test or an exercise is taking place. When the word ‘TEST’ or the abbreviation ‘EXER’ is included, the message may contain information that should not be used operationally or will otherwise end immediately after the word ‘TEST’. [[113]](#_ftnref113) The term ‘resuspended’ to be used for volcanic ash deposits raised by the wind. [[114]](#_ftnref114) If a volcanic ash cloud is reported (e.g. AIREP) but not identifiable from the satellite data. [[115]](#_ftnref115) A straight line between two points drawn on a map in the Mercator projection or a straight line between two points which crosses lines of longitude at a constant angle. [[116]](#_ftnref116) Up to four selected layers. [[117]](#_ftnref117) A straight line between two points drawn on a map in the Mercator projection or a straight line between two points which crosses lines of longitude at a constant angle. [[118]](#_ftnref118) Up to four selected layers. [[119]](#_ftnref119) A straight line between two points drawn on a map in the Mercator projection or a straight line between two points which crosses lines of longitude at a constant angle. [[120]](#_ftnref120) Up to four selected layers.
Appendix 6 Regulation (EU) 2021/1338 <table border="0" cellpadding="0" cellspacing="0" width="680"> <tr> <td colspan="5" valign="top" width="680"> <p><b>Template for advisory for volcanic ash</b></p> <p>Key:</p> <p>M = inclusion mandatory;</p> <p>O = inclusion optional;</p> <p>C = inclusion conditional, included whenever applicable.</p> <p>Note 1: The ranges and resolutions for the numerical elements included in volcanic ash advisory are shown in Appendix 8.</p> <p>Note 2: The explanations for the abbreviations can be found in ICAO Doc 8400 Procedures for Air Navigation Services — ICAO Abbreviations and Codes (PANS-ABC).</p> <p>Note 3: The inclusion of a colon (‘:’) after each element heading is mandatory.</p> <p>Note 4: Row numbers in the ‘Ref.’ column are included only for clarity and ease of reference, and are not part of the advisory for volcanic ash.</p> </td> </tr> <tr> <td valign="top" width="38"> <p>Ref. </p> </td> <td valign="top" width="95"> <p>Element</p> </td> <td valign="top" width="161"> <p>Detailed content</p> </td> <td colspan="2" valign="top" width="387"> <p>Template(s)</p> </td> </tr> <tr> <td valign="top" width="38"> <p>1</p> </td> <td valign="top" width="95"> <p>Identification of the type of message (M)</p> </td> <td valign="top" width="161"> <p>Type of message </p> </td> <td colspan="2" valign="top" width="387"> <p>VA ADVISORY</p> </td> </tr> <tr> <td valign="top" width="38"> <p>2</p> </td> <td colspan="4" valign="top" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>3</p> </td> <td valign="top" width="95"> <p>Status indicator (C) (<a href="#_ftn107">[107]</a>)</p> </td> <td valign="top" width="161"> <p>Indicator of test or exercise</p> </td> <td valign="top" width="161"> <p>STATUS:</p> </td> <td valign="top" width="227"> <p>TEST or EXER</p> </td> </tr> <tr> <td valign="top" width="38"> <p>4</p> </td> <td colspan="4" valign="top" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>5</p> </td> <td valign="top" width="95"> <p>Time of origin (M)</p> </td> <td valign="top" width="161"> <p>Year, month, day, time in UTC</p> </td> <td valign="top" width="161"> <p>DTG:</p> </td> <td valign="top" width="227"> <p>nnnnnnnn/nnnnZ</p> </td> </tr> <tr> <td valign="top" width="38"> <p>6</p> </td> <td colspan="4" valign="top" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>7</p> </td> <td valign="top" width="95"> <p>Name of VAAC (M)</p> </td> <td valign="top" width="161"> <p>Name of VAAC </p> </td> <td valign="top" width="161"> <p>VAAC:</p> </td> <td valign="top" width="227"> <p>nnnnnnnnnnnn</p> </td> </tr> <tr> <td valign="top" width="38"> <p>8</p> </td> <td colspan="4" valign="top" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>9</p> </td> <td valign="top" width="95"> <p>Name of volcano (M)</p> </td> <td valign="top" width="161"> <p>Name and International Association of Volcanology and Chemistry of the Earth’s Interior number of volcano</p> </td> <td valign="top" width="161"> <p>VOLCANO:</p> </td> <td valign="top" width="227"> <p>nnnnnnnnnnnnnnnnnnnnnn [nnnnnn]</p> <p>or UNKNOWN</p> <p>or UNNAMED</p> </td> </tr> <tr> <td width="38"> <p>10</p> </td> <td colspan="4" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>11</p> </td> <td valign="top" width="95"> <p>Location of volcano (M)</p> </td> <td valign="top" width="161"> <p>Location of volcano in degrees and minutes</p> </td> <td valign="top" width="161"> <p>PSN:</p> </td> <td valign="top" width="227"> <p>Nnnnn or Snnnn Wnnnnn or Ennnnn</p> <p>or UNKNOWN</p> </td> </tr> <tr> <td width="38"> <p>12</p> </td> <td colspan="4" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>13</p> </td> <td valign="top" width="95"> <p>State or region (M)</p> </td> <td valign="top" width="161"> <p>State, or region if ash is not reported over a State</p> </td> <td valign="top" width="161"> <p>AREA:</p> </td> <td valign="top" width="227"> <p>nnnnnnnnnnnnnnnn or UNKNOWN</p> </td> </tr> <tr> <td valign="top" width="38"> <p>14</p> </td> <td colspan="4" valign="top" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>15</p> </td> <td valign="top" width="95"> <p>Summit elevation (M)</p> </td> <td valign="top" width="161"> <p>Summit elevation in m (or ft)</p> </td> <td valign="top" width="161"> <p>SUMMIT ELEV:</p> </td> <td valign="top" width="227"> <p>nnnnM (or nnnnnFT)</p> <p>or SFC </p> <p>or UNKNOWN</p> </td> </tr> <tr> <td width="38"> <p>16</p> </td> <td colspan="4" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>17</p> </td> <td valign="top" width="95"> <p>Advisory number (M)</p> </td> <td valign="top" width="161"> <p>Advisory number: year in full and message number (separate sequence for each volcano)</p> </td> <td valign="top" width="161"> <p>ADVISORY NR:</p> </td> <td valign="top" width="227"> <p>nnnn/nnnn</p> </td> </tr> <tr> <td valign="top" width="38"> <p>18</p> </td> <td colspan="4" valign="top" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>19</p> </td> <td valign="top" width="95"> <p>Information source (M)</p> </td> <td valign="top" width="161"> <p>Information source using free text</p> </td> <td valign="top" width="161"> <p>INFO SOURCE:</p> </td> <td valign="top" width="227"> <p>Free text up to 32 characters</p> </td> </tr> <tr> <td valign="top" width="38"> <p>20</p> </td> <td colspan="4" valign="top" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>21</p> </td> <td valign="top" width="95"> <p>Colour code (O)</p> </td> <td valign="top" width="161"> <p>Aviation colour code</p> </td> <td valign="top" width="161"> <p>AVIATION COLOUR CODE:</p> </td> <td valign="top" width="227"> <p>RED or ORANGE or YELLOW or GREEN or UNKNOWN or NOT GIVEN or NIL</p> </td> </tr> <tr> <td valign="top" width="38"> <p>22</p> </td> <td colspan="4" valign="top" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>23</p> </td> <td valign="top" width="95"> <p>Eruption details (M) (<a href="#_ftn108">[108]</a>)</p> </td> <td valign="top" width="161"> <p>Eruption details (including date/time of eruption(s))</p> </td> <td valign="top" width="161"> <p>ERUPTION DETAILS:</p> </td> <td valign="top" width="227"> <p>Free text up to 64 characters</p> <p>or UNKNOWN</p> </td> </tr> <tr> <td width="38"> <p>24</p> </td> <td colspan="4" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>25</p> </td> <td valign="top" width="95"> <p>Time of observation (or estimation) of volcanic ash clouds (M)</p> </td> <td valign="top" width="161"> <p>Day and time (in UTC) of observation (or estimation) of volcanic ash clouds</p> </td> <td valign="top" width="161"> <p>OBS (or EST) VA DTG:</p> </td> <td valign="top" width="227"> <p>nn/nnnnZ</p> </td> </tr> <tr> <td valign="top" width="38"> <p>26</p> </td> <td colspan="4" valign="top" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>27</p> </td> <td valign="top" width="95"> <p>Observed or estimated volcanic ash clouds (M)</p> </td> <td valign="top" width="161"> <p>Horizontal (in degrees and minutes) and vertical extent at the time of observation of the observed or estimated volcanic ash clouds or, if the base is unknown, the top of the observed or estimated volcanic ash clouds;</p> <p>Movement of the observed or estimated volcanic ash clouds</p> </td> <td valign="top" width="161"> <p>OBS VA CLD or EST VA CLD:</p> </td> <td valign="top" width="227"> <p>TOP FLnnn or SFC/FLnnn or FLnnn/nnn [nnKM WID LINE BTN (nnNM WID LINE BTN)] Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn]]</p> <p>MOV N nnKMH (or KT) or</p> <p>MOV NE nnKMH (or KT) or </p> <p>MOV E nnKMH (or KT) or </p> <p>MOV SE nnKMH (or KT) or </p> <p>MOV S nnKMH (or KT) or </p> <p>MOV SW nnKMH (or KT) or </p> <p>MOV W nnKMH (or KT) or </p> <p>MOV NW nnKMH (or KT)</p> <p>or</p> <p>VA NOT IDENTIFIABLE FM SATELLITE DATA</p> <p>WIND FLnnn/nnn nnn/nn[n]KT (<a href="#_ftn109">[109]</a>) or WIND FLnnn/nnn VRBnnKT or WIND SFC/FLnnn nnn/nn[n]KT or WIND SFC/FLnnn VRBnnKT</p> </td> </tr> <tr> <td valign="top" width="38"> <p>28</p> </td> <td colspan="4" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>29</p> </td> <td valign="top" width="95"> <p>Forecast height and position of the volcanic ash clouds<br/> (+6 HR) (M)</p> </td> <td valign="top" width="161"> <p>Day and time (in UTC) <br/> (6 hours from the ‘Time of observation (or estimation) of volcanic ash clouds’ given in Item 12)</p> <p>Forecast height and position (in degrees and minutes) for each volcanic ash cloud mass for that fixed valid time</p> </td> <td valign="top" width="161"> <p>FCST VA CLD +6 HR:</p> </td> <td valign="top" width="227"> <p>nn/nnnnZ</p> <p>SFC or FLnnn/[FL]nnn [nnKM WID LINEBTN (nnNM WID LINE BTN)]Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn]] (<a href="#_ftn110">[110]</a>),(<a href="#_ftn111">[111]</a>)</p> <p>or NO VA EXP</p> <p>or NOT AVBL</p> <p>or NOT PROVIDED</p> </td> </tr> <tr> <td width="38"> <p>30</p> </td> <td colspan="4" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>31</p> </td> <td valign="top" width="95"> <p>Forecast height and position of the volcanic ash clouds (+12 HR) (M)</p> </td> <td valign="top" width="161"> <p>Day and time (in UTC) <br/> (12 hours from the ‘Time of observation (or estimation) of volcanic ash clouds’ given in Item 12)</p> <p>Forecast height and position (in degrees and minutes) for each volcanic ash cloud mass for that fixed valid time</p> </td> <td valign="top" width="161"> <p>FCST VA CLD +12 HR:</p> </td> <td valign="top" width="227"> <p>nn/nnnnZ</p> <p>SFC or FLnnn/[FL]nnn [nnKM WID LINE BTN (nnNM WID LINE BTN)] Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn]] (<a href="#_ftn112">[112]</a>),(<a href="#_ftn113">[113]</a>)</p> <p>or NO VA EXP</p> <p>or NOT AVBL</p> <p>or NOT PROVIDED</p> </td> </tr> <tr> <td width="38"> <p>32</p> </td> <td colspan="4" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>33</p> </td> <td valign="top" width="95"> <p>Forecast height and position of the volcanic ash clouds </p> <p>(+18 HR)</p> </td> <td valign="top" width="161"> <p>Day and time (in UTC) <br/> (18 hours from the ‘Time of observation (or estimation) of volcanic ash clouds’ given in Item 12)</p> <p>Forecast height and position (in degrees and minutes) for each volcanic ash cloud mass for that fixed valid time</p> </td> <td valign="top" width="161"> <p>FCST VA CLD +18 HR:</p> </td> <td valign="top" width="227"> <p>nn/nnnnZ</p> <p>SFC or FLnnn/[FL]nnn [nnKM WID LINE BTN (nnNM WID LINE BTN)] Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] (<a href="#_ftn114">[114]</a>),(<a href="#_ftn115">[115]</a>)</p> <p>or NO VA EXP</p> <p>or NOT AVBL</p> <p>or NOT PROVIDED</p> </td> </tr> <tr> <td valign="top" width="38"> <p>34</p> </td> <td colspan="4" valign="top" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>35</p> </td> <td valign="top" width="95"> <p>Remarks (M) (<a href="#_ftn116">[116]</a>)</p> </td> <td valign="top" width="161"> <p>Remarks, as necessary</p> </td> <td valign="top" width="161"> <p>RMK:</p> </td> <td valign="top" width="227"> <p>Free text up to 256 characters</p> <p>or NIL</p> </td> </tr> <tr> <td width="38"> <p>36</p> </td> <td colspan="4" width="643"> <p>New line</p> </td> </tr> <tr> <td valign="top" width="38"> <p>37</p> </td> <td valign="top" width="95"> <p>Next advisory (M)</p> </td> <td valign="top" width="161"> <p>Year, month, day and time in UTC</p> </td> <td valign="top" width="161"> <p>NXT ADVISORY:</p> </td> <td valign="top" width="227"> <p>nnnnnnnn/nnnnZ</p> <p>or NO LATER THAN nnnnnnnn/nnnnZ </p> <p>or NO FURTHER ADVISORIES </p> <p>or WILL BE ISSUED BY nnnnnnnn/nnnnZ </p> </td> </tr> </table> --- [[107]](#_ftnref107) Used only when the message is issued to indicate that a test or an exercise is taking place. When the word ‘TEST’ or the abbreviation ‘EXER’ is included, the message may contain information that should not be used operationally or will otherwise end immediately after the word ‘TEST’. [[108]](#_ftnref108) The term ‘resuspended’ to be used for volcanic ash deposits raised by the wind. [[109]](#_ftnref109) If a volcanic ash cloud is reported (e.g. AIREP) but not identifiable from the satellite data. [[110]](#_ftnref110) A straight line between two points drawn on a map in the Mercator projection or a straight line between two points which crosses lines of longitude at a constant angle. [[111]](#_ftnref111) Up to four selected layers. [[112]](#_ftnref112) A straight line between two points drawn on a map in the Mercator projection or a straight line between two points which crosses lines of longitude at a constant angle. [[113]](#_ftnref113) Up to four selected layers. [[114]](#_ftnref114) A straight line between two points drawn on a map in the Mercator projection or a straight line between two points which crosses lines of longitude at a constant angle. [[115]](#_ftnref115) Up to four selected layers.