Significant Meteorological Information (SIGMET)
Significant Meteorological Information (SIGMET) : Meteorological information issued concerning weather significant to the safety of aircraft. SIGMET advisories include the following: (a) active thunderstorm areas or lines of thunderstorms; (b) hurricanes, tropical storms; (c) moderate hail; (d) severe turbulence; (e) severe icing; (f) marked mountain waves; (g) widespread sandstorms and dust storms; (h) volcanic ash; (i) severe squall lines; (j) low-level wind shear; and (k) tornadoes or waterspouts
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