What is the reissuance frequency for a TAF that is valid for 30 hours?

The correct answer is that a TAF (Terminal Aerodrome Forecast) with a validity period of 30 hours is reissued every 6 hours.

TAFs are issued to provide weather forecasts for airports and are generally updated at consistent intervals. For TAFs valid for 30 hours, the World Meteorological Organization (WMO) sets a standard reissuance frequency of every 6 hours. This ensures that the forecasts remain current and reflect any changes in weather conditions, which can happen frequently.

The choice of reissuing every 6 hours allows air traffic controllers and pilots to have updated, accurate information without overwhelming them with too frequent updates, as more frequent updates might not provide significant new information. This structured approach to updating TAFs helps manage the flow of information effectively in aviation operations.