GM4 MET.TR.250(a) SIGMET

• ED Decision 2020/008/R found in: ATM/ANS Provision of Services (2017/373) (Mar 2025)

GM4 MET.TR.250(a) SIGMET ED Decision 2020/008/R EXAMPLE OF SIGMET FOR VOLCANIC ASH <table border="1" cellpadding="0" cellspacing="0" width="100%"><tr><td valign="top" width="100%"><p>YUDD SIGMET AO2 VALID 101200/101800 YUSO–</p><p>YUDD SHANLON FIR VA ERUPTION MT ASHVAL PSN N4315 E02115 VA CLD OBS AT 1200Z WI N4315 E02115 - N4345 E02145 – N4330 E02215 – N4245 E02230 - N4230 E02145 - N4315 E02115 FL250/370 WKN FCST AT 1800Z NO VA EXP=</p><p>Meaning:</p><p>The second volcanic ash SIGMET issued for the SHANLON* flight information region (identified by YUDD Shanlon area control centre/upper flight information region) by the Shanlon/International* meteorological watch office (YUSO) since 00.01 UTC; the SIGMET is valid from 12.00 UTC to 18.00 UTC on the 10th of the month; volcanic ash eruption of Mount Ashval* located at 43 degrees 15 minutes north and 21 degrees 15 minutes east; volcanic ash cloud observed at 12.00 UTC within an area bounded by 43 degrees 15 minutes north and 21 degrees 15 minutes east to 43 degrees 30 minutes north and 22 degrees 15 minutes east to 42 degrees 45 minutes north and 22 degrees 30 minutes east to 42 degrees 30 minutes north and 21 degrees 45 minutes east to 43 degrees 15 minutes north and 21 degrees 15 minutes east between flight levels 250 and 370, weakening, and forecast at 18.00 UTC to have dissipated with no volcanic ash expected.</p><p>* Fictitious locations</p></td></tr></table> GM4 MET.TR.250(a) SIGMET ED Decision 2020/008/R EXAMPLE OF SIGMET FOR VOLCANIC ASH <table border="1" cellpadding="0" cellspacing="0" width="100%"> <tr> <td valign="top" width="100%"> <p>YUDD SIGMET AO2 VALID 101200/101800 YUSO–</p> <p>YUDD SHANLON FIR VA ERUPTION MT ASHVAL PSN N4315 E02115 VA CLD OBS AT 1200Z WI N4315 E02115 - N4345 E02145 – N4330 E02215 – N4245 E02230 - N4230 E02145 - N4315 E02115 FL250/370 WKN FCST AT 1800Z NO VA EXP=</p> <p>Meaning:</p> <p>The second volcanic ash SIGMET issued for the SHANLON* flight information region (identified by YUDD Shanlon area control centre/upper flight information region) by the Shanlon/International* meteorological watch office (YUSO) since 00.01 UTC; the SIGMET is valid from 12.00 UTC to 18.00 UTC on the 10th of the month; volcanic ash eruption of Mount Ashval* located at 43 degrees 15 minutes north and 21 degrees 15 minutes east; volcanic ash cloud observed at 12.00 UTC within an area bounded by 43 degrees 15 minutes north and 21 degrees 15 minutes east to 43 degrees 30 minutes north and 22 degrees 15 minutes east to 42 degrees 45 minutes north and 22 degrees 30 minutes east to 42 degrees 30 minutes north and 21 degrees 45 minutes east to 43 degrees 15 minutes north and 21 degrees 15 minutes east between flight levels 250 and 370, weakening, and forecast at 18.00 UTC to have dissipated with no volcanic ash expected.</p> <p>* Fictitious locations</p> </td> </tr> </table>