Regulation
(EU) 2021/1338
A
meteorological watch office shall:
(a) issue SIGMET;
(b) ensure that the SIGMET is cancelled when
the phenomena are no longer occurring or are no longer expected to occur in
the area covered by the SIGMET;
(c) ensure that the period of validity of a
SIGMET is not more than 4 hours, and in the special case of SIGMET for
volcanic ash cloud and tropical cyclones, it shall be extended up to 6 hours;
(d) ensure that SIGMET are issued not more
than 4 hours before the commencement of the period of validity. In the special
case of SIGMET for volcanic ash cloud and tropical cyclones, SIGMET shall be
issued as soon as practicable, but not more than 12 hours before the
commencement of the period of validity, and updated at least every 6 hours.
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