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https://www.noaa.gov/media/digital-library-photo/pl23nssl0020jpgDescription
Rawinsonde weather balloon just after launch. Notice a parachute in the centerof the string and a small instrument box at the end.After release it measures many parameters.These include temperature, relative humidity, pressure, and wind speed.This information is transmitted back to surface observers. (Image credit: NOAA Photo Library, NOAA Central Library; OAR/ERL/National Severe Storms Laboratory (NSSL))