When are WSTs scheduled and how long are they valid?

WSTs, or Weather Statements, are a critical component of aviation weather reporting. They are scheduled for distribution at 55 minutes past the hour, which ensures that pilots and aircrews receive the most up-to-date weather information shortly before the start of the hour. This timing aligns with standard practices in aviation to provide timely information for upcoming flights.

The validity of WSTs is set for two hours or until they are superseded by new information. This two-hour window is crucial for flight planning and situational awareness, as it means the data remains relevant to imminent operations, thereby allowing pilots to make informed decisions based on the latest weather conditions. Once a new WST is issued, it replaces the previous one, ensuring that all stakeholders have access to the most current information.

This structure for timing and validity helps maintain a clear and predictable framework for managing weather data, which is essential for safety in aviation operations. Understanding this helps aviators effectively use weather information in their pre-flight preparations and operational decision-making.