@idefix37 @gkikas-lgpz hi, I find out when the radars do not have any data, caiyunapp do not display any picture and I will try to contact where the radar data came from.
Official website [In the bottom] note the data source from CMA、CASIEE、CWB、NOAA、CEMWF、7timer、Open Weather Map and PM25.in
I am not sure. but in our wiki and Official website, it says "Caiyun Weather really use radar."
(From BAIDU WIKI)
https://baike.baidu.com/item/彩云天气/14690971
I am living in China, and I find out Caiyun Weather always updated less than 10 minutes. I think this case, the satellite could not be always updated less than 10 minutes?