Four delegates from the Observatory participated in the Guangdong - Hong Kong - Macao Seminar on Meteorological Services and Technology in Guangzhou on 17 November 2016. Discussions were made with the counterparts of Guangdong Meteorological Bureau and Macao Meteorological and Geophysical Bureau on various topics, such as automatic regional weather forecast, big data technology, social media application, nowcasting and probabilistic forecast. The three parties introduced their latest development and research findings in meteorological services and technology, shared experience on practical issues commonly faced and discussed possible solutions. Future cooperation opportunities were also explored. Despite the short duration of this one-day seminar, it substantially helped the three parties further improve the quality of weather services in the future.