Convective SIGMET is a weather advisory concerning convective weather significant to the safety of all aircraft. Which phenomena does it typically include?

• A. Weather advisory concerning convective weather significant to the safety of all aircraft, including thunderstorms, hail, and tornadoes
• B. A forecast for general sky conditions
• C. An advisory about icing conditions
• D. An air quality advisory

Answer: (A)

Convective SIGMETs warn about convective weather hazards that can affect the safety of all aircraft. They typically include phenomena like thunderstorms and their associated hazards, such as large hail and tornadoes, along with other severe convective activity that can produce strong gusts or rapid changes in wind. This makes sense because the purpose of a Convective SIGMET is to alert pilots to significant weather that could impact flight safety across a wide area. Forecasts of general sky conditions aren’t SIGMETs, icing conditions are covered by other advisories (like icing-related AIRMETs or non-convective SIGMETs), and an air quality advisory isn’t an aviation weather product. So the description that includes thunderstorms, hail, and tornadoes best fits what Convective SIGMET communicates.