A Convective SIGMET is updated how frequently?

A Convective SIGMET is designed to provide timely updates on significant convective weather phenomena that can impact aviation. These updates occur frequently to ensure pilots and flight planners have the most current information available. Specifically, Convective SIGMETs are issued and updated hourly, positioned at the 55-minute mark past the hour, known as H + 55. This timing allows for the integration of the latest meteorological data and updates, ensuring that any changes in weather conditions are communicated effectively and promptly to those operating in or encountering areas of significant convective activity.

This structure of updating at H + 55 is crucial, as it aligns with the operational needs of aviation, facilitating safe flight planning and operations.