What is a correct statement regarding SIGMET advisories?

SIGMETs, or Significant Meteorological Advisories, are specifically designed to alert pilots to hazardous weather conditions that could significantly affect flight safety. This includes severe weather phenomena such as thunderstorms, turbulence, icing, and volcanic eruptions.

When considering the correct answer, the focus on volcanic eruptions is particularly important: volcanic ash can pose a severe risk to aircraft by affecting visibility and the performance of engines and instruments. Therefore, including volcanic eruptions under the SIGMET advisories is essential for maintaining flight safety during such events.

The relevance of this information emphasizes how SIGMETs function as essential tools in aviation safety, ensuring that pilots are well-informed of potentially hazardous conditions that might arise during their flight paths. Other statements, such as those implying SIGMETs are issued for non-hazardous conditions or specifically for over-water flights, miss the core purpose of these advisories.