The hong kong observatory has been using meteorological balloons for upper - air measurement since 1921 . the weather information obtained is used for weather forecasting and aviation purposes 香港天文台自一九二一年开始利用气象气球探测高空,所得的资料应用于天气预报及航空用途上。
2.
The hong kong observatory has been using meteorological balloons for upper - air measurement since 1921 . the weather information obtained is used for weather forecasting and aviation purposes 香港天文台自一九二一年开始利用气象气球探测高空,所得的资料应用于天气预报及航空用途上。