A record-breaking episode of heavy rain led to the establishment of a colour-based "rainstorm warning system". Besides considering how widespread the heavy rain affects, what other factors are considered when deciding whether to issue a rainstorm warning? How are rainfall data collected? These will be explained in the latest episode of "Cool Met Stuff".
The video is now available on the "MyObservatory" mobile application and the Observatory's website for your viewing (programme is broadcasted in Cantonese).
Observatory's "Cool Met Stuff" channel (broadcast in Cantonese):
Broadcast schedule of various TV channels: