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A Dropwindsonde is an instrument package that contains a
temperature sensor, a moisture sensor (hygrometer) and a GPS
receiver that determines the position of the package in time and
3 dimensional space. Upon release, the dropwindsonde transmits
data to the releasing aircraft (DC-8, WC-130, WP-3) where the
data is collected and saved. When subsequently analysed, the
resultant sounding yields temperature, dew point and wind speed
observed by the instrument.

[Source: NASA]

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