How to Read and Interpret TAF Terminal Aerodrome Forecasts
Master TAF validity periods, change groups (FM, BECMG, TEMPO), and probability indicators in aviation terminal forecasts.
A TAF (Terminal Aerodrome Forecast) is the official weather forecast established for a 5-statute-mile radius around an airport over a 24 to 30-hour period. Its practical value lies in constructing a clean flight timeline for destination and alternate requirements.
Validity Period & Base Conditions
The TAF header displays the ICAO airport identifier, issuance time, and valid forecast period (e.g., 2812/2918 indicating validity from day 28 at 1200Z to day 29 at 1800Z).
The initial lines describe base conditions expected to prevail until subsequent change groups take effect.
Understanding Change Groups: FM, BECMG, TEMPO & PROB
FM (From) indicates a rapid, permanent shift starting at the specified hour and minute (e.g., FM281600). All preceding weather lines are superseded.
BECMG (Becoming) indicates a gradual transition occurring over an interval. TEMPO denotes transient fluctuations lasting less than one hour per instance. PROB30/PROB40 reflects probability of thunderstorms or precipitation.
Checagem Rápida de Fixação
Teste o que você acabou de aprender antes de continuar para a próxima matéria.
Este conteúdo destina-se exclusivamente a fins de estudo teórico, nivelamento técnico e simulação de voo. Para operações de voo real, consulte obrigatoriamente as publicações oficiais em vigor (AIP, ROTAER, NOTAM, cartas DECEA) e os manuais aprovados do fabricante da respectiva aeronave (POH / AFM).