Heavy rain from thunderstorms led to severe flooding and numerous road closures late on Tuesday night all across northern Minnesota, including in Duluth, where officials reported 'extensive damage' from the floodwaters early on Wednesday morning.
AccuWeather.com has been warning the Upper Midwest of the risk of flash and urban flooding since early last week.
Both radar estimates and ground observations have indicated more than a half a foot of rain has fallen as of early on Wednesday morning over a large portion of north-central and northeastern Minnesota, with most of the rain falling over the course of just a few hours' time.
Overnight Tuesday, police in Duluth banned all non-essential travel due to the flooding, which submerged numerous vehicles, leading to water rescues. Some manhole covers were blown off by the pressure of the water in the city, while sinkholes swallowed cars whole.
Mudslides and road collapses were also reported.
In a rare civil emergency bulletin issued overnight, Duluth Police announced that residents in a neighborhood near the Fond du Lac dam were being evacuated. While no threat of a dam failure was imminent, power crews were releasing water to ease the pressure on the structure.
A portion of Interstate 35, Highway 23 and major downtown tunnels were closed Wednesday.
According to the Duluth News Tribune, there were also reports that animals, including a polar bear, escaped from enclosures at the Lake Superior Zoo as floodwaters rose.
Residents and officials are comparing the ongoing situation to flooding that occurred in August 1972 which devastated the city.
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After a brief cooldown late this week, very warm and humid air will bounce back during the Labor Day weekend.
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After several days of summerlike warmth and humidity, cooler and more pleasant air will return to end the week.
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Rochester, MN (1979)
2.73 inches of rain fell in 50 minutes making this the wettest August on record. (9.52 inches of rain so far this month). The heavy downpour flooded the streets of Rochester, stranding about 1,500 cars.
A five-state tornado outbreak in Nebraska, Kansas, Wyoming, Iowa and Missouri occurred on this date. In all, 20 tornadoes were reported. Nine were in Iowa. One near Farragut, IA, in the extreme SW corner of the state, caused several fatalities and numerous injuries.
Sherman Pass, WA (1980)
2 inches of snow.