What is the purpose of a SIGMET?

A SIGMET, which stands for Significant Meteorological Information, is specifically designed to warn pilots about hazardous weather conditions that could affect flight safety. This includes phenomena such as severe turbulence, severe icing, thunderstorms, and other dangerous meteorological events.

The primary function of a SIGMET is to inform pilots of conditions that may pose a risk during flight, allowing them to make informed decisions regarding their flight path, altitude, and take appropriate precautions. This timely information is critical for maintaining flight safety.

The other options, while related to weather or flight information, do not accurately describe the primary role of a SIGMET. Routine weather conditions are typically reported through other means, such as METARs, which provide regular updates about weather conditions but do not highlight significant hazards. General flight information can be disseminated through other sources, and flight restrictions are often communicated via NOTAMs rather than SIGMETs. Thus, the unique focus of SIGMETs on hazardous weather makes the correct answer clear.