Here is a slide show with details about the August 9th, 2012 Duluth/Superior Entry waterspout/tornado.
This was not the first tornado to touch down within the Duluth City limits.
On May 26, 1958 at 3:35 pm a tornado touched down in the Duluth Heights neighborhood then traveled northeast for 6.9 miles before lifting just south of Arnold Road.
There were no injuries reported.
Below is a map of the 1958 tornado path. Click on it for a larger image.