This Great Lake doesn't have tides like the ocean; however, periodically the water levels rise and fall by as much as one foot due to a phenomenon called a seiche (SAYSH, a French word that means to sway back and forth).
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Consequently, the Great Lakes are considered to be non-tidal. Water levels in the Great Lakes have long-term, annual, and short-term variations. Long-term variations depend on precipitation and water storage over many years. Annual variations occur with the changing seasons.
Lake Superior is generally calm and easily paddled between early June and mid-August. Mornings tend to be best for paddling, but it is not unusual to have a glassy calm for days on end.
While there have been past “sightings,” most have turned out to be pranks or misidentifications. The reality is that the largest of the Great Lakes (Lake Superior and Michigan) are extremely deep lakes that are too cold for sharks.
Lake Superior freezes at least in part every year and less frequently in its entirety. The last year that it froze completely was in February 1994. It almost froze completely in March 2003 and this photograph was taken by the GOES satellite on March 7, 2003.
Lake Superior's beaches are open and safe for swimming over 90% of the time, and the water is extremely clear, with an average underwater visibility of 8.3 m (27 ft).
Frozen Fury: The 1913 White Hurricane The White Hurricane of 1913 was a storm so large that it ravaged the entire Great Lakes region and so intense that its 80-mph winds equaled those of a Caribbean hurricane.
In most cases, lakes are confined to smaller fetches which limit wave size, but the Great Lakes are large enough to produce frequent swells up to several metres. However, the highest ever recorded waves were 8.7 metres, outside of Marquette, Michigan, on Lake Superior.