@petra-pik of course I will wait until the stormy season. However, I am convinced that there is a problem with the storm sign in the baseline forecast for the ICON EU model. I thought this model did not predict storms. only when I saw this sign in the ICON GLOBAL model I found that there must be some error

Hi @FranciscoMateus, this is a test pattern of the radar. You can read more on this here:
https://community.windy.com/topic/13493/what-is-this/6?_=1600681067491

'Strange' behavior of the radar:
https://www.weather.gov/jetstream/radarfaq#everything
https://www.radartutorial.eu/15.weather/wx21.en.html