Two new weather buoys were successfully deployed by the Hong Kong Observatory in waters off the Hong Kong International Airport in early January 2004. There are now a total of five weather buoys operating around Chek Lap Kok.

Since weather buoys were first deployed in 2001, they have provided useful weather observations over the data-sparse sea areas near the airport. Weather observations from these new buoys, including wind, temperature, humidity, pressure, sea surface temperature and rainfall, are radioed to the airport in real-time. These observations have been found to be useful to forecasters in issuing timely alerts of windshear events, especially those arising from sea breeze.