What does a current CONVECTIVE SIGMET forecasting thunderstorms indicate?

A current CONVECTIVE SIGMET is specifically designed to provide critical information about significant weather phenomena that could affect aviation operations. When it comes to thunderstorms, a CONVECTIVE SIGMET indicates that there are thunderstorms present which may be obscured by extensive cloud layers, making them difficult to visually identify. This is particularly important for pilots, as obscured thunderstorms can pose a serious hazard due to the potential for severe turbulence, hail, and possible wind shear.

This information is crucial for flight planning and safety, as pilots need to be aware of not only the presence of thunderstorms but also their visibility conditions. While moderate thunderstorms and turbulence might indeed be associated with the phenomena described in other options, the essence of a CONVECTIVE SIGMET focuses on the significant weather hazards that could be present, particularly emphasizing the fact that these thunderstorms may not be easily visible, thus warranting attention and caution.