@mrpetewx
Let's take an example here in Europe.
Today the skies were clear over the Alps, making it possible to see where the snow still remains on the ground.
The Satellite layer shows snow on the Alps mountains and a small amount on the Jura mountain. This mountain range northwest of Geneva is not very high.
(Its name gave the word “Jurassic” known as a geological period
https://en.m.wikipedia.org/wiki/Jurassic
… and a famous film :))
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A webcam confirms that the summits are still covered in snow.
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What do the different models show about the snow depth layer?
ICON 13km sees no snow on the Jura. Very inaccurate on the Alps compared to the satellite image.
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ECMWF 9 km sees some snow on the Jura but not correctly placed. And always coarse on the Alps.
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The best forecast is made by ICON-D2 with its high resolution of 2km. It really highlights the snow at the top of the Jura range. And also with more granularity on the Alps compared to the satellite image.
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Conclusion
In mountain this Snow depth layer is only really useful with a high resolution model.