What do SIGMETs provide warnings about?

SIGMETs, or Significant Meteorological Information reports, provide warnings about short-term weather hazards that could impact flight safety. These hazards typically include severe turbulence, significant thunderstorms, volcanic ash, and other critical weather phenomena that can develop over a relatively brief period.

The focus on short-term hazards is crucial for pilots as it helps them make informed decisions during flight planning and en route operations, ensuring the safety of passengers and crew. By highlighting significant weather events that could pose dangers, SIGMETs serve as an essential tool for real-time situational awareness in aviation.

Other options like long-term forecasts do not apply here, as SIGMETs are specifically designed for imminent weather threats. Similarly, normal weather conditions fall outside the scope of SIGMETs, which focus exclusively on significant hazards. Lastly, while airspace restrictions are relevant to aviation operations, SIGMETs do not deal specifically with such restrictions; they are dedicated to reporting hazardous weather conditions that could affect those operations.