Going only by memory (but I'm old enough), and not by youtube, I remember Welk's accent not as German but as North Dakotan, or a No. Dak. variant. Doubtless heavily influenced by German.

More on the German than the Scandinavian side. Of course, with Fargo, the whole world came to know the North Dakota/Minnesota accent....the Scandi variant.

But I will say, my law firm in Tacoma was founded by guys from North Dakota after the War. Three of them. There was no trace of that accent....

Speaking of those great guys (one is still alive at 94), two were at Jamestown College in ND when Pearl Harbor was bombed. They went down and immediately enlisted in the Navy. One was on four war patrols in the Western Pacific in a submarine, the USS Pogy. The other was the only survivor of his LST when it hit a mine at Ulithi, also in the Western Pacific. They went to University of Michigan law school after the War. Like a lot of men from that time, they weren't going back to North Dakota.....

As my still-living partner put it, when he was offered a job out of law school by a businessman in North Dakota his family had known: "I have other plans". The war had definitely stirred the pot.....Go West......