Which situation would prompt the issuance of a Convective SIGMET?

The issuance of a Convective SIGMET is specifically designed to highlight hazardous weather conditions that are primarily related to convective activity, such as thunderstorms. The correct scenario involves thunderstorms that are producing heavy precipitation and affecting a large area.

This situation is critical because such thunderstorms can lead to severe weather phenomena, including heavy rain, severe turbulence, and potentially hazardous conditions such as hail or tornadoes. The wide area of impact signifies a significant risk to aviation, making it essential for pilots to be aware of these developments in order to safely navigate.

On the other hand, thunderstorms producing light precipitation do not generally warrant the alerting nature of a Convective SIGMET, as they typically do not pose the same level of threat to aviation operations. Severe icing conditions and clear air turbulence, while serious concerns, are not classified under Convective SIGMETs since they relate to different weather phenomena rather than direct convective activity. Hence, it's the combination of heavy precipitation and its extensive impact area that justifies the need for a Convective SIGMET in this scenario.