https://www.rt.com/usa/452457-ice-tsunami-batters-great-lakes/
‘Ice tsunami’ spurs evacuations, road closures in Great Lakes region (PHOTOS, VIDEO)
Published time: 26 Feb, 2019 13:12 Edited time: 26 Feb, 2019 13:19
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Wind speeds of up to 75 mph, hurricane strength, have damaged power lines and felled trees in some parts of the Great Lakes region, including both the Canadian and US sides of Niagara Falls.
“Strong winds blowing ice over the retaining wall from the lake,” local police warned. “Drive with caution.”
Residents of Hoover Beach were asked to voluntarily evacuate as a precaution ahead of the potential onslaught of an ‘ice tsunami,’ a phrase which may not feature in most local emergency preparedness meetings. Ice tsunamis are formally referred to as “ice shoves, ice pushes, or ivu” and have been studied throughout the last century.
They typically occur in early spring as the ice sheets weaken and begin to break up, as seen along the shores of the Great Lakes. Ice shoves measuring up to 16 feet tall were recorded along Alaska’s Chuck Sea in 2001.
“Basically, this is the same process as a storm surge, but you’re dealing with sub-freezing temperatures,” Andrew Futrell, Geographic Information Systems (GIS) administrator at North Carolina State University, told IFLScience.
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“Instead of ruining a house by flood damage, [the ice] can bulldoze over structures.”
Up to 100 million people were subjected to wind advisories along the Great Lakes region in recent days thanks to the same system that created snow in parts of Arizona and even in Las Vegas.
