In the symbols used on a weather map, which component of the station model is the only one that may not be found in exactly the same position for each station

Wind Direction

Explanation:

The station models are a type of symbolic illustration that is shown on the weather maps and occurs at a given reporting station and it allows the users to analyze the patterns of the given atmospheric pressure temperature and the wind speed, along with the cloud cover and the rainfall.   As the phenomenon on the winds is different for various places there speeds also vary according to there directions and they are shown by the flags and starlight lines and feathers that point in direct to the winds.

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The time of day would be around 3: 00