SIGMET Information : Information issued by a meteorological office concerning the occurrence or expected occurrence of specified enroute weather phenomena that may affect the safety of aircraft operations
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}