Scientists launch these to collect information about conditions in Earth’s atmosphere that affect the weather, such as temperature and air pressure. The balloons are made of rubber and weigh up to one kilogram.
The information collected from the instruments on weather balloons are used to learn about current weather conditions, to help meteorologists to make weather forecasts, and to collect data for other scientific research projects. Weather balloons carry instrument packages that are called radiosondes. Scientists have been using them since the 1930s.
To gather information for weather forecasts, weather balloons are launched twice a day, every day, from 800 locations around Earth. They are launched at the same time all over the world. The balloons rise more than 24.14 kilometers (15 miles) while collecting data.
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