What are Convective SIGMETs issued for?

Convective SIGMETs are specifically designed to provide timely information about significant convective weather that can affect aviation safety. They are primarily issued for conditions that include embedded thunderstorms, lines of thunderstorms, and thunderstorms that are capable of producing severe weather phenomena such as hail and tornadoes. This information is crucial for pilots and aviation personnel as it indicates areas where dangerous weather conditions can occur, allowing them to make informed decisions about flight operations.

The focus of Convective SIGMETs is on the severity and potential impacts of thunderstorm activity. By highlighting situations with embedded or organized storm systems, these alerts ensure that aviators are aware of potential hazards that are not just visible in isolated storm events but also in more complex weather systems where thunderstorms are intertwined.

In contrast, other options address weather conditions that are not covered by Convective SIGMETs. Severe thunderstorms and hail are indeed part of what might be described, but the comprehensive scope specified in the selected correct answer makes it the most accurate choice. High winds and snow pertain to different aviation warnings, while clear skies and light winds would not warrant a SIGMET at all, as they do not indicate any significant weather that could affect flight safety.