FAA Ground School Practice Test

What type of weather phenomenon does a SIGMET warn pilots about?

1. Hazardous weather for selected aircraft types

2. Conditions affecting general navigational aids

3. Weather phenomena like thunderstorms and severe turbulence

4. General atmospheric conditions

The correct answer is: Weather phenomena like thunderstorms and severe turbulence

A SIGMET, or Significant Meteorological Information, primarily warns pilots about hazardous weather phenomena that could pose a risk to aircraft. This includes specific threats like thunderstorms, severe turbulence, icing, and other significant weather events. These alerts are crucial for flight safety as they provide real-time information about severe weather that could impact flight operations over a wide area. The focus on thunderstorms and severe turbulence highlights the seriousness of these weather events, which can directly affect an aircraft's performance and safety. Understanding that a SIGMET pertains to these specific and hazardous conditions helps pilots make informed decisions about flight routes and safety measures. While hazardous weather for selected aircraft types might suggest a level of specificity in targeting, SIGMETs are more broad in scope, aiming to inform all pilots of significant weather phenomena. Conditions affecting general navigational aids and general atmospheric conditions are more about routine weather monitoring rather than the immediate hazards that a SIGMET addresses.