The first major flash flood of six or more inches in 24 hours in 2012 was the heavy rain event of June 14, 2012. The 8.83 inches measured at Cannon Falls is the largest 24-hour total June rainfall measured at a Minnesota National Weather Service Volunteer Cooperative station in the history of the program. The previous record was 8.67 inches measured on June 17, 1957 at Minneota.
The June 19-20, 2012 flood in northeast Minnesota hit southern St. Louis County, Carlton and Aitkin County the hardest. The main event occurred from around noon on the 19th through about noon on the 20th. At the Duluth National Weather Service the rainfall total on June 19th was 4.14 inches, with the two day total of 7.24 inches. The record one day total rainfall for Duluth is 5.20 inches on July 21, 1909. The highest precipitation total found so far for the multi-day event is 10.10 inches from a NWS employee just northeast of Duluth. Two Harbors saw 9.93 inches of rain.