FAA Ground School Practice Test

Which in-flight advisory contains information on severe icing not linked to thunderstorms?

1. AIRMET

2. SIGMET

3. Convective SIGMET

4. Weather Advisory

The correct answer is: SIGMET

The correct answer is SIGMET. SIGMETs are advisory messages issued by the National Weather Service that provide important information regarding significant weather phenomena which can impact aviation safety. They specifically focus on severe weather conditions such as turbulence, severe icing, and volcanic ash that are not associated with thunderstorms. In the context of severe icing, SIGMETs detail conditions that can pose serious hazards to aircraft, supported by specific observations and reports. They serve to alert pilots about hazardous weather that may occur during flight or affect planned routes. AIRMETs provide information on less severe weather phenomena, including moderate icing and turbulence, but they do not address severe conditions as comprehensively as SIGMETs. Convective SIGMETs are focused specifically on convective weather phenomena like thunderstorms and are not applicable to icing that is unrelated to these systems. The term "Weather Advisory" does not represent a formal advisory system for aviation and is too general to denote information regarding severe weather.