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Look at this map, interesting...pigmentation is latitude correlated , not racial correlated!
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Well, this map shows Cromagnoids in North Africa which are against that rule if its right.
Migrations do disrupt such order of course, and the way of living and other things are very important as well.
You are right about Vitamin D, but that does explain mainly the light skin tone, but the really milky-rosy skin tone, blond hair and blue eyes might be also or in combination with environmental factors sexually selected.
Dont forget, in other regions its the risk of skin cancer which prevents lighter skin, even if its seen as something attractive.
Only in the cloudy North it was possible that it was selected, or in cultures which were able to protect themselves from the sun. But that doesnt mean that the blond hair must have come up just because of the environment, probably the environment "allowed" that feature in great numbers.
I think the first blondism and red hair as well, was the feature of the oldest hunter gatherers of the North, mainly Cromagnids.
Probably out of a mixture the Nordid type came up and lighter pigmentation was selected, or the Nordid type (in the narrower sense = Skandonordid) evolved the depigmentation too.
Both is possible...
For the Alpinoids: There were many theories of how they came up, but such a distribution is best explained by what I often described here and at Skadi as Alpinisation out of the general Cromagnoid populations.
Cromagnoids lived in Central Asia as well, fully Europid ones of course, because Mongolids came there only later.
The Turanids/Pamirids show somewhat Alpinid features, but that might be rather due the same specialization than due common ancestors.