How many hours can a TAF be extended for special situations like a "TAF Amendment"?

A Terminal Aerodrome Forecast (TAF) is generally issued for a standard period of 24 hours, but in special situations, such as a TAF Amendment, it can be extended. Specifically, when significant changes in weather conditions occur that warrant a revision to the forecast, the TAF can be amended to extend up to 12 hours from the original valid period. This allows for updated information to be communicated, ensuring pilots and aviation personnel have the most accurate and timely weather forecasts for flight planning. This important aspect helps to maintain safety and operational efficiency in aviation.