The forecasting website I use is:
https://www.dxinfocentre.com/tropo_eas.html
This is just a reference image for "Yulu". Recently, it has been showing abnormal readings every day, resulting in only a few JA values, which is quite funny.
https://prop.kc2g.com/
As I said to the original poster, if the maximum available frequency is high, it indicates a higher probability of abnormal propagation, which can be seen in Figure 1.
https://pskreporter.info/pskmap.html
Common PSK modes, primarily based on reporting information from WSJT and JTDX software, have high accuracy. However, occasionally, users may transmit on the wrong frequency, resulting in error messages. This requires some skill to differentiate between correct and incorrect signals. However, if there are many active lines, it is generally possible to determine that communication is occurring (since the information is only uploaded after receiving a decoded signal, making it more reliable).
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