Trend Type Forecast
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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 three hour period 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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