I believe this happened aprox. the same time in the Midwest.. In what is present North Dakota, South Dakota, Manitoba and Saskatchewan..
That Glacial Lake is referred to as Lake Agassis (sp?) ( pronounced, "Ag-ah-see"..)
I once thought it broke to the south, ( which it did, sorta.. ) but it actually broke mainly to the north, into canada..
I believe Lake Agassis is responsible for the large shoals/beds of sand and gravel in Minnesota, which produce some of the most beautiful agate in my memory..
Imagine it's 11,000 years ago, and imagine that you are high above midwestern North America. All you see below you is a lake — a giant lake, born of a massive, continental glacier.
Bigger than Lake Superior, larger than any freshwater body on the earth today, ancient Lake Aggasiz extended from northern Saskatchewan in the west to northeastern Ontario in the east, and from southern Minnesota in the south to northern Manitoba in the north.
Rising and Falling: Glacial Lake Aggasiz (named for Louis Aggasiz, 19th century Swiss naturalist and glaciation theorist) began to form about 12,000 years ago, as the Laurentide Ice Sheet retreated northward. Over the next 5,000 years, it changed its boundaries several times, as glacial ice advanced and retreated. At the peak of its coverage, the lake drained to the south through the Minnesota River Valley, west through northern Saskatchewan to Alaska, and east to the Great Lakes. About 8,500 years ago, the southern part of the lake drained for the last time, and about 1,000 years later, it was gone from northern Canada.
Today, the Red River Valley exists in what was the southwestern portion of Lake Aggasiz, extending just over 500 kilometres from Lake Traverse in the south to Lake Winnipeg in the north.
I have seen this explained by placing the original Tibetans as a coastal people during the Ice Age and these myths are about the giant tsunamis they witnessed before they migrated/fled inland. The end of the Ice Age was a very unsettled time.