With ice floating in the Duluth Shipping Canal, the Lake Superior Seiche, or sometimes referred to as tide, becomes apparent. This time-lapse was taken over a two hour period this afternoon.
Learn more about the seiche at:https://www.nps.gov/articles/coastal-geohazards-seiches.htm#:~:text=Generally%20a%20seiche%20would%20take,NOAA%20illustration