SIGMET describes what kind of information?

• A. The acronym for Significant Meteorological information. A weather advisory in abbreviated plain language concerning the occurrence or expected occurrence of potentially hazardous en route weather phenomena that may affect the safety of aircraft operations. SIGMET is warning information, hence it is of highest priority among other types of meteorological information provided to the aviation users.
• B. A regional weather forecast for pilots.
• C. A system for navigation in low visibility.
• D. A measurement of atmospheric pressure.

Answer: (A)

SIGMET conveys significant meteorological information. It’s a weather advisory issued for hazardous en route weather phenomena that may affect the safety of flight, presented in plain language and given high priority so pilots can take timely avoidance or cautionary actions. The kinds of phenomena it covers include severe icing, severe turbulence, thunderstorms with strong hazards, strong winds and wind shear, dust or sand storms that reduce visibility, and volcanic ash clouds. This is not simply a regional forecast, a navigation system, or a measurement of atmospheric pressure; it is a focused warning about weather conditions that could threaten safe operations along a flight path.