@TZ I was in a Taiwan's weather company before, but now just an open data user.

@TZ CWB only offers the latest data, it updates every 10 minutes. (All of the CWB open data are the same...)

@TZ You can get the XML file at http://opendata.cwb.gov.tw/opendataapi?dataid=O-A0059-001&authorizationkey=YOUR_APIKEY
The data description is in the XML file, I translate it in below image :-)

Hello Windy Group,

The Central Weather Bureau of Taiwan released the radar reflectivity data in XML format. It can download at http://opendata.cwb.gov.tw (register for free, in Chinese), data ID is A0059-001. It will be useful for Windy Map.

Tytony Cheng