Which type of advisory contains information about significant weather events?

The correct answer is SIGMET. SIGMETs (Significant Meteorological Information) are essential for pilots as they provide information about significant weather events that could affect the safety of flight. These advisories cover hazardous weather conditions such as thunderstorms, turbulence, and volcanic ash that could significantly impact aviation operations. They are used to alert pilots to weather phenomena that are not adequately covered by other types of reports.

In contrast, AIRMETs focus on less severe weather conditions that may still be hazardous to smaller aircraft, such as mist, light turbulence, or low ceilings. PIREPs (Pilot Reports) are reports from pilots currently in flight, providing real-time information about observed weather conditions rather than forecasts or advisories about future significant weather. The Aviation Area Forecast provides a general forecast of conditions over a certain area but does not specify significant weather events like SIGMETs do. This context makes it clear that SIGMETs are uniquely positioned to alert pilots about significant weather hazards crucial for flight safety.