weather balloon

noun Meteorology.

Origin:
1935–40

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Science Dictionary
weather balloon  
A balloon used to carry instruments aloft to gather meteorological data in the atmosphere. Weather balloons are tracked by radar, Global Positioning System, or theodolites. The balloon itself usually contains devices to measure temperature, pressure and humidity, although it can contain specialized devices to measure the ozone in the ozone layer. Filled with hydrogen or helium gas, weather balloons can reach 35 km (22 mi) in altitude before disintegrating due to the decreased pressure of the lower stratosphere.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The equipment was sent close to space using a helium-filled weather balloon.
Military officials retreated the next day, calling the curious debris merely a
  downed weather balloon.
In particular, officials are concerned that a slew of copycat weather balloon
  launches could pose a risk to commercial aviation.
Take a giant weather balloon and hook it up to the mouth of the pipe.
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