With the version Routing & Navigation 2.0.81, Weather4D supports weather files in GRIB2 format by external download. For example, the very high resolution model ICON-D2 (¹) of German Weather Service (DWD) for Northern Europe can be opened in the app.
Just go to OpenSkiron website and make a tap on the desired area :
The file is downloaded to Apple Files app in "Downloads" folder. Tapping on the file opens the share window, then select Weather4D.
This long-awaited compatibility will soon be extended to the Weather4D Lite and Routing versions.
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(¹) Alternative weather models
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