Time period and areas
This alert is valid until Thursday evening or Friday morning in the east of the alert area. Which brings us to the area: it extends from the Hautes Alpes in France to the Arlberg, i.e. essentially everything that is covered in the west, with the core lying from northern Valais to the Hautes Alpes.
East of the Arlberg, in the colder north-westerly phases, you can also scrape along the 30 cm alarm in congested areas, but overall it's less worthwhile there.
Wind
As we enter the Ullr megalooping with the rollercoaster, our ride is extremely fast. It storms and storms and storms. But nobody wants to be above the tree line anyway with a probable alert level 4-5. I'm even pretty sure that some areas will remain closed. It might calm down a bit towards Friday.
After all, everything is coming back up to the main ridge, or beyond and all the way into Valais. Last time, Zermatt had almost the most fresh snow (and that from the west!).