In April 2018, two meteotsunamis formed on Lake Michigan in the same day. Other meteotsunamis on the Great Lakes have risen up to 7, 10 and 12 feet in the last 31 years. The largest meteotsunami was recorded in Croatia in 1978.
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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.
“The waves hit you every three to five seconds in the Great Lakes, where in the ocean it might be 10 to 12 seconds between waves,” said Guy Meadows, a Michigan senior research scientist.