The Hong Kong Observatory began upper-air meteorological observations in 1921. It has long used weather balloons for collecting high-quality upper-air climate data, boasting a long history of upper-air meteorological observations. In 2021, the Hong Kong Observatory's upper-air observing station received certification from the WMO as a Centennial Upper-Air Observing Station, making it the first upper-air observing station in the world.
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