Ground winds

Some data formats include a field for the ground wind speed and direction. At first glance, Windsond should be able to report this... but it can't, since the wind is sensed by the balloon floating with the air movements (i.e. winds) as it rises. Before the balloon starts rising it's anchored (typically by someone holding it...) and can't measure winds. But wait a moment, what exactly is meant by winds on the ground? Due to the physics of fluid mechanics, wind movement very near the ground will...
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