We want to move from point A to point B using a balloon.
If one knows the wind directions, How can one determine the altitude that will steer the Balloon to the desired location?
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This is more about navigation than earth science.
Wind direction will obviously affect the direction of travel of a balloon. You are unlikely to get a wind that will correspond with the bearing you require. If you do you are lucky - use it!
As with sailing, you will most likely have to travel on a given bearing for a certain amount of time before changing direction for another period of time and repeat this procedure until you reach your target. With different wind speeds and directions at different altitudes this will necessitate a change of altitude to the wind direction you require for the next leg of a journey.
Unless you are a very experienced balloonist, planning on-the-go to determine when to change altitude and to which altitude, will be required.