radiosonde
/ˈreɪdioʊˌsɑnd/
noun
- A device carried by a balloon or aircraft that measures weather conditions in the upper atmosphere and sends the data back to Earth by radio.
- Data from the radiosonde helped forecasters predict the approaching storm.
- The weather service launched a radiosonde to measure temperature and humidity at high altitudes.
- Each radiosonde transmits information about wind speed and air pressure as it rises through the sky.