DULUTH (AP) -- Powerful winds have whipped up big waves along the shores of Lake Superior, flooding a business district and causing power outages.

The National Weather Service says a Canadian freighter measured a wind gust of 86 mph near Castle Danger north of Duluth Wednesday afternoon. Hurricane-force wind begins at 74 mph. The gale-force winds are creating waves as high as 14 to 18 feet. The Canal Park business district near the lake was flooded.

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The high wind knocked out service for about 4,700 Minnesota Power customers in the Duluth area Wednesday morning.

The weather service issued a lakeshore flooding warning until 4 p.m. Wednesday for Duluth and Superior and Ashland in Wisconsin.

Elsewhere in northern Minnesota, rain was changing to snow with accumulations of at least 6 inches by early Thursday.