Reinhard:
I don't know much about the .hrs files, but I know a little, just enough to be dangerous. They are index files created from the .cat files. They should not be edited. If you edit one of the .cat files, you need to delete the corresponding .hrs file. WeatherCat will then recreate the .hrs file when you restart it. If any of this is incorrect, Edouard will enlighten us when he logs in.
By the way, we just received our first snow of the season, 18 cm.