Trend Type Forecast 

A TTF or Trend Type Forecast also known simply as a Trend, is an aviation weather forecast written by a real person on location at a major airport or military base. A TTF is a professionally considered forecast for weather over a two hour period1 and is based on an actual weather report, such as a METAR or SPECI.

A TTF is similar to or sometimes in addition to a TAF, a Terminal Aerodrome Forecast, but during the TTF's validity period is considered superior to a TAF.

References

  1. ^ "Annex 3 to the Convention on International Civil Aviation - Meteorological Service for International Air Navigation", Sixteenth Edition July 2007, para 6.3.3, p. 6-2.


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