Which product identifier corresponds to Convective SIGMET?

The correct product identifier for Convective SIGMET is WST. Convective SIGMETs are important aviation weather advisories that specifically address hazardous convective weather conditions, such as thunderstorms and severe turbulence. The WST identifier is used in the format of a special weather advisory that provides pilots with critical information regarding weather phenomena that can significantly impact flight safety.

In contrast, the other identifiers represent different types of weather advisories. CIG is not used for Convective SIGMETs; rather, it is associated with cloud information. PLW refers to significant weather warnings, which are also not linked to Convective SIGMETs. Lastly, AIRMETs are used to describe less severe weather phenomena that may still impact flight safety, and are distinct from Convective SIGMETs, which focus on more severe storm activity. Therefore, WST is the only correct and relevant identifier for Convective SIGMET.