Bad weather at ZBAA yesterday not reported in TAF/METAR?
On a positioning flight VHHH - ZBAA yesterday we were put into an en route hold for an hour (they initially said three hours!) because of bad weather in ZBAA. I've found some historic TAFs / METARS and this weather isn't reported anywhere. I know it happened, but am surprised that the authorities decided that it was "Not in China's interest" to tell people.
Today a colleague is on a similar flight. Again the TAF/METAR doesn't say anything about bad weather. However he's just been told that they're being delayed because of weather.
Does anyone know
1. Why this meteo information isn't published (shirly it endangers aircraft)
2. How the airline ascertained the information.