In aviation meteorology, a trend type forecast (TTF), also known simply as a trend, is a weather forecast written by a person on location at a major airport or military base. A TTF is a professionally considered forecast for weather over a two-hour period,[1] and is based on an actual weather report, such as a METAR or SPECI and appended to the end of it.[1]
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.[citation needed]
^ ab"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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( 0 ≤ β ≤ 1 {\displaystyle 0\leq \beta \leq 1} ) is the trend smoothing factor. To forecast beyond x t {\displaystyle x_{t}} is given by the approximation:...
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