ICAO Annex 3
Appendix 2.
1.3 Significant weather (SIGWX) forecasts
1.3.3 Items included in SIGWX forecasts
SIGWX forecasts shall include the following items:
a) tropical cyclone provided that the maximum of the 10-minute mean surface wind speed is expected to reach or exceed 17 m/s (34 kt);
b) severe squall lines;
c) moderate or severe turbulence (in cloud or clear-air);
d) moderate or severe icing;
e) widespread sandstorm/duststorm;
f) cumulonimbus clouds associated with thunderstorms and with a) to e);
g) flight level of tropopause;
h) jet streams;
(...)
Appendix 6.
1. Specifications related to SIGMET information
1.1.4 In accordance with the template in Table A6-1A, only one of the following phenomena shall be included in a SIGMET message, using the abbreviations as indicated below:
Thunderstorm (...)
Tropical cyclone (...)
Turbulence
- severe icing due to freezing rain SEV ICE (FZRA)
Duststorm (...)
Sandstorm (...)
Volcanic Ash (...)
Radioactive cloud (...)
METARs and TAFs may include conditions that may lead to severe icing, however, severe icing information is not included.
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