SIGMET
noun
SIG·MET
variants:
or less commonly sigmet \ ˈsig-ˌmet 
\
\
plural SIGMETs
also sigmets
Definition of SIGMET
: a notice of significant hazardous weather conditions (such as extreme turbulence, icing, or poor visibility) in a large area that is provided to the pilot of an aircraft before takeoff — compare airmet
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