Last Updated
：2025/11/20
pilot balloon
（ plural ）
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(meteorology) A small unmanned balloon whose ascent is followed by a theodolite to obtain data for the computation of the speed and direction of winds in the upper air.
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pilot balloon
The meteorologist released a pilot balloon at dawn to track upper-air winds before the storm.
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The meteorologist released a pilot balloon at dawn to track upper-air winds before the storm.
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