What is included in a SIGMET?

A SIGMET, or Significant Meteorological Information, is specifically designed to provide important information about non-convective hazardous conditions that may affect the safety of all aircraft. This includes severe turbulence, severe icing, and volcanic ash, among other weather phenomena that can significantly affect flying conditions. The focus of a SIGMET is on safety and operational effectiveness for all aircraft operating in the affected areas.

The other options represent different types of weather-related information that do not meet the criteria for inclusion in a SIGMET. Routine weather updates are typically part of standard weather briefings, while general air traffic advisories focus on traffic management rather than specific hazardous weather conditions. Basic tourist weather reports are general forecasts meant for public consumption and lack the specificity required for aviation safety. Therefore, the inclusion of non-convective hazardous conditions for all aircraft is crucial for understanding the significance and purpose of a SIGMET.