This system calculates the movement of rain areas detected by weather radars and then projects from these movements the rainfall in the territory 该系统利用气象雷达探测所得降雨分布情况，计算降雨区的移动速度，从而推算香港境内的雨量。
2.
The observatory ' s weather radar system at tate ' s cairn detects rain within about 500 km of hong kong and gives estimates of rain intensity and movement 天文台设于大老山的天气雷达，能监察香港约500公里范围内的降雨区，和估计雨势及雨区的移动。
