What are issued for thunderstorms, tornadoes, and hail 3/4 inch or larger, but do NOT include references to all weather associated with thunderstorms?

• A. SIGMET
• B. PIREP
• C. WST
• D. TAF

Answer: (C)

Understanding which aviation weather advisory warns about dangerous convective activity helps you pick the right product when thunderstorms pose real hazards. When thunderstorms bring significant hazards like tornadoes or hail at least 3/4 inch in diameter, the appropriate advisory is the convective weather bulletin. In your course materials this is labeled as WST, signaling that the message focuses specifically on convective hazards rather than all weather associated with thunderstorms. It’s designed to alert pilots to the significant threats to flight safety from thunderstorms, not to recap every weather phenomenon a storm might produce.

General SIGMETs cover a broader range of significant weather and aren’t restricted to convection, so they aren’t the precise match here. PIREPs are pilot weather reports, not advisories issued to warn all flights. TAFs are terminal forecasts for a specific airport and don’t describe ongoing convective hazards along a route.