Trend Type Forecast

Trend Type Forecast

A TTF is a Trend Type Forecast, 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 period"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.] 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.

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