How is a change in wind direction represented in TAFs?

In TAFs, changes in wind direction are noted using the term "BECMG," which indicates that there will be a gradual change in the weather conditions, including wind direction. Following "BECMG," the specific details about the new wind direction and speed are included. This allows for clear communication of anticipated changes in wind conditions over a specified period.

Using "BECMG" is important because it signifies that the change is not instantaneous but rather is developing over a certain timeframe, helping pilots and meteorologists prepare for shifts in wind that could affect flight planning and safety.

The other options do not appropriately indicate a change in wind direction as clearly or are not relevant for this purpose. For example, "PROB" is used to indicate the probability of specific weather events occurring but does not specifically address wind changes. "LIFR" denotes "Low Instrument Flight Rules," indicating very low visibility or ceiling conditions, which does not pertain to wind direction. Simply stating the wind speed is insufficient for conveying changes in wind direction.