Updated 12:10 p.m. | Posted 8:48 a.m.
Torrential rains swept across parts of northeast and east-central Minnesota early Thursday morning, dumping more than 6 inches of rain on areas already soaked by recent storms. The rain fell as quickly as 2 inches an hour in some Iron Range locations.
The National Weather Service in Duluth says radar showed very heavy rain from Tower to Cook.
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As of 8:30 a.m., the Mora airport had received more than 6 1/2 inches of rain. Roads in Mora were closed and authorities reported cars stranded by high water.
Rainfall map from the past 12 hours, showing 4 to 7" has fallen from the Lake Mille Lacs area southeast to Mora. Significant flooding has been reported in the Mora area. We would really appreciate any additional rainfall or flooding reports. #mnwx pic.twitter.com/m1JkMMH00m— NWS Twin Cities (@NWSTwinCities) July 12, 2018
Roads were reported washed out near Cook and in Pine River. There were also reports of flooding on U.S. Highway 169 in Hill City.
The downpour prompted a sharp rise of the Mississippi river gauge in Aitkin. Staff at an assisted living center in Aitkin reported water pouring into the facility through leaks in the windows and the roof.
Aitkin County Sheriff Scott Turner tells me he's had a report of 10 inches of rain overnight near Malmo, on the east shore of Mille Lacs Lake.— Tim Nelson (@timnelson_mpr) July 12, 2018
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"In some cases in southern Aitkin County, they received 4 to 5 inches in just about two hours," said Joe Moore, a meteorologist with the National Weather Service in Duluth. "And of course, those are isolated spots, but a lot of this area received an extreme amount of rainfall."
A flash flood warning was issued for parts of central Minnesota. The rain is subsiding and moving into Wisconsin, but authorities say drivers should be prepared to encounter unexpected flooding and road damage, and they should avoid standing or moving water.