Yellow warning for blizzards

Courtesy UKMO

I feel that I must apologise, for what reason I don’t know because no one down in Exeter ever reads this heretical blog, about an earlier post in which I had expressed my surprise that the Met Office had not issued a warning for snow and strong winds in association with storm Christoph. Little did I realise that the crafty devils had indeed issued a yellow warning for snow and ice at 1204 UTC, but because their warnings page froze for a couple of hours I couldn’t see it. Anyway in this yellow warning the Great Oz says that he is expecting 10 to 15 cm of snow to fall on low ground in the Grampian area later on Wednesday and into Thursday, with as much as 30 to 40 cm over the hills, but he doesn’t elaborate on high these hills are. He further goes onto say that as strong winds develop in the early hours of Thursday this will lead to blizzards over hills and mountains. I just have a couple of questions regarding the warning itself:-
Why can’t blizzards occur on low ground as well as high ground?
And wet snow can still produce blizzards as far as I remember, it also has the nasty habit of forming big white mounds in places called drifts. There’s no mention of any severe drifting, or for that matter a separate warning for strong winds either. And what do all these potential impacts and hazards add up to? A measly yellow warning – has he gone completely mad?

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